To create a new chart, you must specify the chart type, the dimension of the chart, the input data source information, and the column mapping for the chart template. In this appendix, we look at the various chart types and the methods used to map the columns. There are also a number of fully functional examples in this appendix. Note that unless otherwise noted, all examples use the Woodview HSQL database, which is located in the <EspressChartInstall>/help/examples/DataSources/database directory. In order to run the examples, you'll need to add database HSQL JDBC driver (hsqldb.jar) to your classpath. The driver is located in the <EspressChartInstall>/lib directory.
Charts can either be two or three-dimensional. Given below are the dimensions and the constant to select that dimension:
Two-Dimensional | QbChart.VIEW2D |
Three-Dimensional | QbChart.VIEW3D |
Charts have one of the following chart types. Given below are the different dimensions and the constants to select them:
Column Chart |
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Bar Chart |
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Line Chart |
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Area Chart |
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Pie Chart |
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XY(Z) Scatter Chart |
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Stack Column Chart |
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Stack Bar Chart |
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Stack Area Chart |
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High Low Chart |
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HLCO Chart |
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Percentage Column Chart |
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Surface Chart |
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Bubble Chart |
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Overlay Chart |
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Box Chart |
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Radar Chart |
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Dial Chart |
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Gantt Chart |
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Polar Chart |
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For more information on the different chart types, please refer to the Chapter 5 - Chart Types and Data Mapping.
Each chart type requires two (or more) data columns to be mapped in order to create a chart object. For more detail on the mapping (and for a definition of the terms used here), please refer to the Chapter 5 - Chart Types and Data Mapping.
To define the Column Mapping for the chart template, the ColInfo class (located in the quadbase.ChartAPI package) is used.
The columns (from the data source) are numbered from left to right, starting with Column “0”. The column positions, passed to the ColInfo object, are based on the data table. Note that the parameters for ColInfo objects are “-1” by default. A negative column position indicates that the particular parameter is not being used.
![[Caution]](../../../images/caution.png) | Caution |
|---|---|
As you may know, creating objects in java is a resource intensive operation. It is always recommended that you do not create too many objects. One way to conserve resource is to reuse |
Column/Bar/Line/Area/Pie/Overlay charts need a category and a value axis. Those are the minimum requirements for constructing such types of charts. You can also add in a series and a subvalue if needed. The subvalue refers to the secondary axis i.e., it contains the column that gets mapped to the secondary axis.
For instance, given the data shown below:
| Order # | Product | Units Ordered | Units Shipped |
|---|---|---|---|
| 12 | Chair | 15 | 12 |
| 12 | Table | 34 | 26 |
| 14 | Chair | 8 | 8 |
| 14 | Table | 23 | 14 |
Original Data
The following code sets the category to be Column 1 (Product), the series to be Column 0 (Order #), the value to be Column 3 (Units Shipped) and the subvalue to be Column 2 (Units Ordered):
ColInfo colInfo = new ColInfo(); colInfo.category = 1; colInfo.series = 0; colInfo.value = 3; colInfo.subvalue = 2;
Constructing a Column chart is relatively straight forward. We have already discussed how to set the ColInfo array and how to obtain the data in previous sections. The following code demonstrates how to create the aforementioned Column chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 1;
colInfo.series = 0;
colInfo.value = 3;
colInfo.subvalue = 2;
String dataType[] = {"integer", "varchar", "decimal", "decimal"};
String fieldName[] = {"Order #", "Product", "Units Ordered", "Units Shipped"};
String records[][] = {{"12", "Chair","15", "12"}, {"12", "Table","34", "26"},
{"14" , "Chair","8", "8"}, {"14" , "Table","23", "14"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.COL, // Column Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Column chart shown below:
Generated Column Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a Radar chart are the same as the parameters for a Column/Bar/Line/Area chart except the subvalue. A secondary axis cannot be defined.
For instance, given the data shown below:
| Order # | Product | Units Ordered |
|---|---|---|
| 12 | Chair | 15 |
| 12 | Table | 34 |
| 12 | Cabinet | 21 |
| 12 | Dresser | 24 |
| 14 | Chair | 23 |
| 14 | Table | 23 |
| 14 | Cabinet | 16 |
| 14 | Dresser | 19 |
Original Data
The following code sets the category to be Column 1 (Product), the series to be Column 0 (“Order #”) and the value to be Column 2 (“Units Ordered”):
ColInfo colInfo = new ColInfo(); colInfo.category = 1; colInfo.series = 0; colInfo.value = 2;
The following code demonstrates how to create the aforementioned Radar chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 1;
colInfo.series = 0;
colInfo.value = 2;
String dataType[] = {"integer", "varchar", "decimal"};
String fieldName[] = {"Order #", "Product", "Units Ordered"};
String records[][] = {{"12", "Chair", "15"}, {"12", "Table", "34"},
{"12" , "Cabinet", "21"}, {"12" , "Dresser", "24"},
{"14" , "Chair", "23"}, {"14" , "Table", "23"},
{"14" , "Chair", "23"}, {"14" , "Table", "23"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.RADAR, // Radar Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Radar chart shown below:
Generated Radar Chart
Note that the chart created is a default chart without any formatting done to it.
Scatter charts need a xvalue and a yvalue axis. Those are the minimum requirements for constructing such types of charts. You can also add in a series and a zvalue (for three-dimensional Scatter charts) axis if needed.
For instance, given the data shown below:
| Season | High Temperature | Average Temperature | Low Temperature |
|---|---|---|---|
| Summer | 110 | 101 | 96 |
| Fall | 103 | 85 | 78 |
| Winter | 85 | 75 | 67 |
| Spring | 93 | 88 | 81 |
Original Data
The following code sets the xvalue to be Column 2 (Average Temperature), the yvalue to be Column 1 (High Temperature), and the zvalue to be Column 3 (Low Temperature):
ColInfo colInfo = new ColInfo(); colInfo.xvalue = 2; colInfo.yvalue = 1; colInfo.zvalue = 3;
The following code demonstrates how to create the aforementioned Scatter chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.xvalue = 2;
colInfo.yvalue = 1;
colInfo.zvalue = 3;
String dataType[] = {"varchar", "integer", "integer", "integer"};
String fieldName[] = {"Season", "High Temperature", "Average Temperature", "Low Temperature"};
String records[][] = {{"Summer", "110", "101", "96"}, {"Fall", "103", "85", "78"},
{"Winter", "85", "75", "67"}, {"Spring", "93", "88", "81"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW3D, // Three-Dimensional
QbChart.SCATTER, // Scatter Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a three-dimensional Scatter chart shown below:
Generated Scatter Chart
Note that the chart created is a default chart without any formatting done to it.
In addition to the parameters for a Column/Line/Area chart, a Stack Column/Percentage Column/Stack Bar/Stack Area also requires the SumBy parameter to be set. The minimum requirements for creating a Stack Column/Percentage Column/Stack Bar/Stack Area chart are the category, the value and the sumby parameters. You can also add in a series and a subvalue if needed.
For instance, given the data shown below:
| Day | Drink | Total | Average |
|---|---|---|---|
| Monday | Water | 101 | 5.4 |
| Monday | Coffee | 85 | 2.4 |
| Tuesday | Water | 143 | 6.7 |
| Tuesday | Coffee | 92 | 2.5 |
| Wednesday | Water | 186 | 7.6 |
| Wednesday | Coffee | 121 | 4.2 |
| Thursday | Water | 173 | 6.3 |
| Thursday | Coffee | 75 | 1.1 |
| Friday | Water | 88 | 3.6 |
| Friday | Coffee | 193 | 5.9 |
| Saturday | Water | 152 | 7.3 |
| Saturday | Coffee | 57 | 1.6 |
| Sunday | Water | 194 | 8.8 |
| Sunday | Coffee | 25 | 0.6 |
Original Data
The following code sets the category to be Column 0 (“Day”), the value to be Column 2 (“Total”), the sumby to be Column 1 (“Drink”) and the subvalue to be Column 3 (“Average”):
ColInfo colInfo = new ColInfo(); colInfo.category = 0; colInfo.value = 2; colInfo.subvalue = 3; colInfo.sumBy = 1;
The following code demonstrates how to create the aforementioned Stack Area chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 0;
colInfo.value = 2;
colInfo.subvalue = 3;
colInfo.sumBy = 1;
String dataType[] = {"varchar", "varchar", "integer", "double"};
String fieldName[] = {"Day", "Drink", "Total","Average"};
String records[][] = {{"Monday", "Water", "101","5.4"}, {"Monday", "Coffee", "85","2.4"},
{"Tuesday", "Water", "143","6.7"}, {"Tuesday", "Coffee", "92","2.5"},
{"Wednesday", "Water", "186","7.6"}, {"Wednesday", "Coffee", "121","4.2"},
{"Thursday", "Water", "173","6.3"}, {"Thursday", "Coffee", "75","1.1"},
{"Friday", "Water", "88","3.6"}, {"Friday", "Coffee", "193","5.9"},
{"Saturday", "Water", "152","7.3"}, {"Saturday", "Coffee", "57","1.6"},
{"Sunday", "Water", "194","8.8"}, {"Sunday", "Coffee", "25","0.6"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.STACKAREA, // Stack Area Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Stack Area chart shown below:
Generated Stack Area Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a Dial chart are the same as the parameters for a Radar chart except the series. A series column cannot be defined.
For instance, given the data shown below:
| Product | Units Ordered |
|---|---|
| Chair | 15 |
| Table | 34 |
| Cabinet | 21 |
| Dresser | 24 |
Original Data
The following code sets the category to be Column 0 (“Product”) and the value to be Column 1 (“Units Ordered”):
ColInfo colInfo = new ColInfo(); colInfo.category = 0; colInfo.value = 1;
The following code demonstrates how to create the aforementioned Dial chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 0;
colInfo.value = 1;
String dataType[] = {"varchar", "integer"};
String fieldName[] = {"Product", "Units Ordered"};
String records[][] = {{"Chair", "15"}, {"Table", "34"},
{"Cabinet", "21"}, {"Dresser", "24"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.DIAL, // Dial Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Dial chart shown below:
Generated Dial Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a Box chart are the same as the parameters for a Column/Bar/Line/Area/Pie/Overlay chart except the series. A series column cannot be defined.
For instance, given the data shown below:
| Subject | Student | Score |
|---|---|---|
| Math | A.S. | 65 |
| Math | T.E. | 75 |
| Math | V.Q. | 83 |
| Math | X.C. | 87 |
| Math | I.Z. | 93 |
| Science | A.S. | 86 |
| Science | T.E. | 90 |
| Science | V.Q. | 73 |
| Science | X.C. | 95 |
| Science | I.Z. | 84 |
Original Data
The following code sets the category to be Column 0 (“Subject”) and the value to be Column 2 (“Score”):
ColInfo colInfo = new ColInfo(); colInfo.category = 0; colInfo.value = 2;
The following code demonstrates how to create the aforementioned Box chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 0;
colInfo.value = 2;
String dataType[] = {"varchar", "varchar", "integer"};
String fieldName[] = {"Subject", "Student", "Score"};
String records[][] = {{"Math", "A.S.", "65"}, {"Math", "T.E.", "75"},
{"Math", "V.Q.", "83"}, {"Math", "X.C.", "87"},
{"Math", "I.Z.", "93"}, {"Science", "A.S.", "86"},
{"Science", "T.E.", "90"}, {"Science", "V.Q.", "73"},
{"Science", "X.C.", "95"}, {"Science", "I.Z.", "84"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.BOX, // Box Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Box chart shown below:
Generated Box Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a Bubble chart are the same as the parameters for a three-dimensional Scatter Chart. The xvalue, yvalue and zvalue parameters are necessary to draw a Bubble Chart. Note that for a bubble chart, the zvalue refers to the Bubble Size.
For instance, given the data shown below:
| Drink | High | Average | Low |
|---|---|---|---|
| Water | 3 | 2 | 2 |
| Soda | 1 | 1 | 0 |
| Coffee | 5 | 2 | 1 |
| Tea | 3 | 1 | 1 |
Original Data
The following code sets the series to be Column 0 (“Drink”), xvalue to be Column 1 (“quote>High”), the yvalue to be Column 3 (“Low”), and the zvalue to be Column 2 (“Average”):
ColInfo colInfo = new ColInfo(); colInfo.xvalue = 1; colInfo.yvalue = 3; colInfo.zvalue = 2; colInfo.series = 0;
The following code demonstrates how to create the aforementioned Bubble chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.xvalue = 1;
colInfo.yvalue = 3;
colInfo.zvalue = 2;
colInfo.series = 0;
String dataType[] = {"varchar", "integer", "integer", "integer"};
String fieldName[] = {"Drink", "High", "Average", "Low"};
String records[][] = {{"Water", "3", "2", "2"}, {"Soda", "1", "1", "0"},
{"Coffee", "5", "2", "1"}, {"Tea", "3", "1", "1"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.BUBBLE, // Bubble Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Bubble chart shown below:
Generated Bubble Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a High-Low/HLCO chart differ from the parameters of the other chart types. Here the value part of the chart is further subdivided into an open value, a close value, a high value and a low value. The minimum requirements for a High-Low chart are the category, the high value and the low value parameters (for a HLCO, the close value and open value parameters are also required). You can also additionally add in the series and subvalue parameters as well.
For instance, given the data shown below:
| Day | Company | High | Low | Close | Open | Volume |
|---|---|---|---|---|---|---|
| 2001-01-01 | ABC | 1.33 | 1.18 | 1.22 | 1.23 | 43723 |
| 2001-01-01 | DEF | 9.24 | 8.74 | 9.16 | 8.89 | 18478 |
| 2001-01-01 | GHI | 2.20 | 1.82 | 2.14 | 1.97 | 46743 |
| 2001-01-02 | ABC | 1.87 | 0.79 | 1.63 | 1.12 | 33605 |
| 2001-01-02 | DEF | 9.48 | 8.12 | 8.93 | 8.66 | 16758 |
| 2001-01-02 | GHI | 2.47 | 2.32 | 2.44 | 2.34 | 60671 |
| 2001-01-03 | ABC | 2.47 | 0.22 | 0.44 | 0.63 | 45211 |
| 2001-01-03 | DEF | 9.94 | 9.92 | 9.93 | 9.93 | 10697 |
| 2001-01-03 | GHI | 2.48 | 2.40 | 2.46 | 2.44 | 45238 |
| 2001-01-04 | ABC | 1.8 | 1.38 | 1.79 | 1.44 | 50224 |
| 2001-01-04 | DEF | 9.49 | 8.87 | 8.94 | 8.93 | 11868 |
| 2001-01-04 | GHI | 2.06 | 1.45 | 1.96 | 1.46 | 62053 |
| 2001-01-05 | ABC | 1.23 | 0.58 | 0.79 | 0.79 | 37285 |
| 2001-01-05 | DEF | 9.94 | 8.61 | 8.08 | 8.94 | 10476 |
| 2001-01-05 | GHI | 2.8 | 1.58 | 2.45 | 1.96 | 47117 |
Original Data
The following code sets the category to be Column 0 (Day), the series to be Column 1 (Company), the High to be Column 2 (High), the Low to be Column 3 (Low), the Close to be Column 4 (Close), the Open to be Column 5 (Open) and the subvalue to be Column 6 (Volume):
ColInfo colInfo = new ColInfo(); colInfo.category = 0; colInfo.series = 1; colInfo.high = 2; colInfo.low = 3; colInfo.close = 4; colInfo.open = 5; colInfo.subvalue = 6;
The following code demonstrates how to create the aforementioned HLCO chart.
Component doDataFromArguments(Applet applet) {
// Do not connect to EspressManager
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
ColInfo colInfo = new ColInfo();
colInfo.category = 0;
colInfo.series = 1;
colInfo.high = 2;
colInfo.low = 3;
colInfo.close = 4;
colInfo.open = 5;
colInfo.subvalue = 6;
String dataType[] = {"date", "varchar", "double", "double", "double", "double", "integer"};
String fieldName[] = {"Day", "Company", "High", "Low", "Close", "Open", "Volume"};
String records[][] = {{"2001-01-01", "ABC", "1.33", "1.18", "1.22", "1.23", "43723"},
{"2001-01-01", "DEF", "9.24", "8.74", "9.16", "1.23", "18478"},
{"2001-01-01", "GHI", "2.20", "1.82", "2.14", "1.23", "46743"},
{"2001-01-02", "ABC", "1.87", "0.79", "1.63", "1.23", "33605"},
{"2001-01-02", "DEF", "9.48", "8.12", "8.93", "1.23", "16758"},
{"2001-01-02", "GHI", "2.47", "2.32", "2.44", "1.23", "60671"},
{"2001-01-03", "ABC", "1.12", "0.22", "0.44", "1.23", "45211"},
{"2001-01-03", "DEF", "9.94", "9.92", "9.93", "9.93", "10697"},
{"2001-01-03", "GHI", "2.48", "2.40", "2.46", "2.44", "45238"},
{"2001-01-04", "ABC", "1.80", "1.38", "1.79", "1.44", "50224"},
{"2001-01-04", "DEF", "9.49", "8.87", "8.94", "8.93", "11868"},
{"2001-01-04", "GHI", "2.06", "1.45", "1.96", "1.46", "62053"},
{"2001-01-05", "ABC", "1.23", "0.58", "0.79", "0.79", "37285"},
{"2001-01-05", "DEF", "9.94", "8.61", "8.08", "8.94", "10476"},
{"2001-01-05", "GHI", "2.80", "1.58", "2.45", "1.96", "47117"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.HLCO, // HLCO Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional HLCO chart shown below:
Generated HLCO Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a Surface chart are similar to those of a three-dimensional Scatter chart. The xvalue, yvalue and zvalue parameters are required to create a surface chart. However, a surface chart does not support the series parameter. For a surface chart, the ColInfo object defined is always the same no matter what the data is.
For instance, given the data shown below:
| 0 | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| 10 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 20 | 0 | 0 | 0 | 0 | 1 | 2 | 1 | 0 | 0 | 0 | 0 |
| 30 | 0 | 0 | 0 | 1 | 2 | 3 | 2 | 1 | 0 | 0 | 0 |
| 40 | 0 | 0 | 1 | 2 | 3 | 4 | 3 | 2 | 1 | 0 | 0 |
| 50 | 0 | 1 | 2 | 3 | 4 | 5 | 4 | 3 | 2 | 1 | 0 |
| 60 | 0 | 0 | 1 | 2 | 3 | 4 | 3 | 2 | 1 | 0 | 0 |
| 70 | 0 | 0 | 0 | 1 | 2 | 3 | 2 | 1 | 0 | 0 | 0 |
| 80 | 0 | 0 | 0 | 0 | 1 | 2 | 1 | 0 | 0 | 0 | 0 |
| 90 | 0 | 0 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 0 |
| 100 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
Original Data
The following code sets the mapping for the surface chart. Note that this mapping is constant for surface charts:
int map[] = {0, 2, 1}; ColInfo colInfo = new ColInfo(-1, map);
The following code demonstrates how to create the aforementioned Surface chart.
Component doDataFromArguments(Applet applet) {
QbChart.setEspressManagerUsed(false);
int map[] = { 0, 2, 1 };
ColInfo colInfo = new ColInfo(-1, map);
String inputFileName = "surface.dat";
QbChart chart = null;
try {
chart = new QbChart(applet, // Applet
QbChart.VIEW3D, // Three-Dimensional
QbChart.SURFACE, // Surface Chart
QbChart.DATAFILE, // Type of text file
inputFileName, // Data
false, // Do not transpose data
colInfo, // Column information
null); // No specified template
} catch (Exception ex)
{
ex.printStackTrace();
}
return chart;
}When the above code is run as an applet or an application, it will produce a three-dimensional Surface chart shown below:
Generated Surface Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a Gantt chart are similar to those of a High-Low chart. Here the category, high (or start date) and low (end date) parameters are required to create a Gantt chart. You can also add a series parameter if needed.
For instance, given the data shown below:
| Project | Task | Starting Date | Ending Date |
|---|---|---|---|
| Project 1 | Task A | 1998-01-15 | 1998-03-01 |
| Project 1 | Task B | 1998-02-25 | 1998-05-18 |
| Project 1 | Task C | 1998-06-11 | 1998-09-29 |
| Project 2 | Task A | 1998-03-15 | 1998-09-29 |
| Project 2 | Task B | 1998-04-25 | 1998-08-18 |
| Project 2 | Task C | 1998-08-11 | 1998-12-29 |
Original Data
The following code sets the category to be Column 1 (“Task”), the High to be Column 2 (“Starting Date”), the Low to be Column 3 (“Ending Date”) and the series to be Column 0 (“Project”).
ColInfo colInfo = new ColInfo(); colInfo.category = 1; colInfo.high = 2; colInfo.low = 3; colInfo.series = 0;
The following code demonstrates how to create the aforementioned Gantt chart.
Component doDataFromArguments(Applet applet) {
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 1;
colInfo.high = 2;
colInfo.low = 3;
colInfo.series = 0;
String dataType[] = {"varchar", "varchar", "date", "date"};
String fieldName[] = {"Project", "Task", "Starting Date","Ending Date"};
String records[][] = {{"Project1", "Task A", "1998-01-15","1998-03-01"},
{"Project1", "Task B", "1998-02-25","1998-05-18"},
{"Project1", "Task C", "1998-06-11","1998-09-29"},
{"Project2", "Task A", "1998-03-15","1998-05-08"},
{"Project2", "Task B", "1998-04-25","1998-08-18"},
{"Project2", "Task C", "1998-08-11","1998-12-29"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.GANTT, // Gantt Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Gantt chart shown below:
Generated Gantt Chart
Note that the chart created is a default chart without any formatting done to it.
The ColInfo parameters for a Polar chart are similar to those of a Scatter Chart. Here the radius, and angle parameters are required to create a Polar chart. You can also add a series parameter if needed.
For instance, given the data shown below:
| Radius | Angle | Series |
|---|---|---|
| 0 | 2 | A |
| 90 | 4 | A |
| 180 | 6 | A |
| 270 | 8 | A |
| 360 | 10 | A |
| 45 | 3 | B |
| 135 | 5 | B |
| 225 | 7 | B |
| 315 | 9 | B |
Original Data
The following code sets the radius to be Column 0 (“Radius”), the Angle to be Column 1 (“Angle”), and the series to be Column 2 (“Series”).
ColInfo colInfo = new ColInfo(2, new int[]{0, 1});
The following code demonstrates how to create the aforementioned Polar chart.
Component doDataFromArguments(Applet applet) {
QbChart.setEspressManagerUsed(false);
// Column Mapping
ColInfo colInfo = new ColInfo(2, new int[]{0, 1});
String dataType[] = {"integer", "integer", "varchar"};
String fieldName[] = {"Radius", "Angle", "Series"};
String records[][] = {{"0", "2", "A"}, {"90", "4", "A"}, {"180", "6", "A"},
{"270", "8", "A"}, {"360", "10", "A"}, {"45", "3", "B"},
{"135", "5", "B"}, {"225", "7", "B"}, {"315", "9", "B"}};
DbData data = new DbData(dataType, fieldName, records);
QbChart chart = new QbChart
(applet, // Applet
QbChart.VIEW2D, // Two-Dimensional
QbChart.POLAR, // Polar Chart
data, // Data
colInfo, // Column information
null); // No specified template
return chart;
}When the above code is run as an applet or an application, it will produce a two-dimensional Polar chart shown below:
Generated Polar Chart
Note that the chart created is a default chart without any formatting done to it.
EspressChart allows date/time based zooming in charts. The date/time based zooming can be applied to the chart of almost any type (except high-low, HLCO, scatter, Surface, Box, Dial, Radar, Bubble and Gantt charts). The only major requirement is that the data along the category axis be of date, time or timestamp type.
Zooming can be achieved by setting the attributes and then refreshing the chart. The attributes are set using the quadbase.util.IZoomInfo interface.
The following example, which can run as example or application, shows a chart that incorporates zooming. Here the default zooming shows 5 days at a time while the maximum zoom-out allowed is 1 month and the maximum zoom-in allowed is 1 day.
// Data passed in an array in memory DbData chartData = new DbData(dataTypes, fieldNames, data); // Set Column Mapping ColInfo colInfo = new ColInfo(); colInfo.category = 1; colInfo.value = 0; // Create Chart QbChart chart = new QbChart( (Applet)null, // Applet QbChart.VIEW2D, // Dimension QbChart.COL, // Chart Type chartData, // Data colInfo, // Column Mapping null); // Template // Get a handle to the Zooming interface IZoomInfo zoomInfo = chart.gethZoomInfo(); zoomInfo.setAggregateOperator(IZoomInfo.SUM); // Specify the aggregation zoomInfo.setMaxScale(1, IZoomInfo.YEAR); // Specify max zoom out zoomInfo.setMinScale(1, IZoomInfo.DAY); // Specify max zoom in zoomInfo.setScale(5, IZoomInfo.DAY); // Specify current zooming zoomInfo.setLinearScale(true); // Turn on Linear Scale zoomInfo.setZoomEnabled(true); // Turn on Zooming try { chart.refresh(); // Refresh the chart with zooming } catch (Exception ex) { ex.printStackTrace(); } return chart;
When the above code is run as an applet or application, it will produce a top-level chart shown below:
Generated Chart
You can then zoom in or zoom out on this chart, depending on the selections you make in the pop-up menu (which you can see by right-clicking on the chart canvas).
Please note that this is a default chart that is generated without formatting of any kind.
In addition to regular queries, you can pass in queries that has one, or more, parameters and have the chart prompt the user for values for the parameters, before generating the chart. Note that only stand-alone charts can be parameterized.
To use a parameterized query as your data source for your chart, you must create a class that implements IQueryFileInfo (you can use the implementation already provided, SimpleQueryFileInfo) and use that class to pass in the parameter information.
Given below is an example of a chart that uses a parameterized query. The database against which the query is run is WoodView HSQL, so you will need to add database HSQL JDBC driver (hsqldb.jar) to your classpath. The driver is located in the <EspressChartInstall>/lib directory.
Component doParameterizedChart(Applet applet) {
// Do not use EspressManager
QbChart.setEspressManagerUsed(false);
// Begin Code : Adding Parameter Info
// SimpleQueryInParam(name of Parameter, String to be displayed, MapToColumn?, tableName, ColumnName, SQL Type, DefaultValue, value)
SimpleQueryInParam inParam = new SimpleQueryInParam("param", "Please select", true,
"Categories", "CategoryName", Types.VARCHAR, "Arm Chairs", null);
SimpleQueryInParam[] paramSet = { inParam };
SimpleQueryFileInfo chartInfo = new SimpleQueryFileInfo(
"jdbc:hsqldb:woodview",
"org.hsqldb.jdbcDriver",
"sa",
"",
"select Products.ProductName, Products.UnitsInStock from Categories, Products where Categories.CategoryID=Products.CategoryID and Categories.CategoryName=:param order by Categories.CategoryName, Products.ProductName;");
chartInfo.setInParam(paramSet);
// End Code : Adding Parameter Info // Begin Code : Setting up Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 0;
colInfo.value = 1;
// End Code : Setting up Column Mapping
QbChart chart = new QbChart(applet, QbChart.VIEW2D, QbChart.PIE, chartInfo, colInfo, null);
return chart;
}When the above code is run as an applet or an application, it will produce a chart (depending on the parameter selected) similar to the one shown below:
Generated Chart
Please note that this is a default chart that is generated without formatting of any kind.
You can also assign a parameter to have multiple values, for example, in the case where a user wants to check against a range of values rather than just a single value. The range of values is usually specified within the “IN” clause of a SQL query. Note that EspressChart only considers parameters within the “IN” clause to be multi-value.
To use a multi-value parameterized query as your data source for your chart, you must create a class that implements IQueryFileInfo and use that class to pass in the parameter information.
Given below is an example of a chart that uses a multi-value parameterized query. The database against which the query is run is WoodView HSQL, so you will need to add database HSQL JDBC driver (hsqldb.jar) to your classpath. The driver is located in the <EspressChartInstall>/lib directory.
Component doMultiValueParameter(Applet applet) {
// Do not use EspressManager
QbChart.setEspressManagerUsed(false);
// Begin Code : Adding Parameter Info
SimpleQueryMultiValueInParam inParam =
new SimpleQueryMultiValueInParam("param", "Please select", true,
"Categories", "CategoryName", Types.VARCHAR, "Arm Chairs", null);
SimpleQueryMultiValueInParam[] paramSet = { inParam };
SimpleQueryFileInfo chartInfo = new SimpleQueryFileInfo(
"jdbc:hsqldb:woodview",
"org.hsqldb.jdbcDriver",
"sa",
"",
"select Products.ProductName, Products.UnitsInStock from Categories, Products where Categories.CategoryID=Products.CategoryID and Categories.CategoryName in(:param) order by Categories.CategoryName, Products.ProductName;");
chartInfo.setInParam(paramSet);
// End Code : Adding Parameter Info
// Begin Code : Setting up Column Mapping
ColInfo colInfo = new ColInfo();
colInfo.category = 0;
colInfo.value = 1;
// End Code : Setting up Column Mapping
QbChart chart = new QbChart(applet, QbChart.VIEW2D, QbChart.PIE, chartInfo, colInfo, null);
return chart;
}When the above code is run as an applet or application, it will produce a chart (depending on the parameter selected) similar to the one shown below:
Generated Chart
Please note that this is a default chart that is generated without formatting of any kind.
Note that If there are more than one parameters in the IN clause, each of them is considered single-value. For example, in the query:
Select * From Products Where ProductID IN (:param1, :param2, :param3)
:param1, :param2, and :param3 are all single-value parameters.
Initializing a multi-value parameter is the same as initializing a single-value parameter. The only difference is in the value selection dialog. While single-value parameters will translate into a drop down box, multi-value parameters will be given a multi-selection list box.
EspressChart supports different drill down capabilities. They are:
Parameter drill down
Data drill down
Dynamic drill down
Like parameterized charts, drill down charts are available only when generating stand-alone charts.
Constructing the different types of drill down charts are described in the sections below.
With the help of parameterized queries, parameter drill down charts can be created. Instead of having a chart with large amounts of data in it, you can show a top level chart showing the minimum data required and then delve deeper on the selected data. For more information on parameter drill down charts, please refer to the Section 7.3 - Parameter Drill-Down
To create a parameter drill down chart, you need to create the various chart objects (please note that all chart objects, other than the root chart object, will have parameterized queries as their data source) and then specify the order of the drill down as well as the column/bar/point/line/slice of the chart to attach the next level of the parameter drill down chart.
Given below is an example of a parameter drill down chart. The database against which the query is run is WoodView HSQL, so you will need to add database HSQL JDBC driver (hsqldb.jar) to your classpath. The driver is located in the <EspressChartInstall>/lib directory.
Component doDrillDownChart(Applet applet) {
//Do not use EspressManager
QbChart.setEspressManagerUsed(false);
// Begin Code : Creating Chart 1 - the Root Chart
DBInfo rootInfo = new DBInfo("jdbc:hsqldb:woodview","org.hsqldb.jdbcDriver",
"sa",
"",
"SELECT Employees.LastName, Count(Orders.OrderID) AS Count_Of_OrderID FROM Employees, Order_Details, Orders WHERE (Orders.EmployeeID = Employees.EmployeeID) AND (Orders.OrderID = Order_Details.OrderID) GROUP BY Employees.LastName");
ColInfo rootColInfo = new ColInfo(-1, 0, -1, 1);
QbChart rootChart = new QbChart(applet, QbChart.VIEW2D, QbChart.PIE, rootInfo, false, rootColInfo, null);
SimpleQueryInParam inParam = new SimpleQueryInParam("LastName", "Please select", true,
"Customers", "Company", Types.VARCHAR,
"All Unfinished Furniture", null);
SimpleQueryInParam[] paramSet = {inParam};
SimpleQueryFileInfo levelChartInfo = new SimpleQueryFileInfo("jdbc:hsqldb:woodview",
"org.hsqldb.jdbcDriver", "sa", "",
"SELECT Categories.CategoryName, Employees.LastName, Sum(Order_Details.Quantity) AS Sum_Of_Quantity FROM Products, Employees, Categories, Order_Details, Orders WHERE (Orders.OrderID = Order_Details.OrderID) AND (Employees.EmployeeID = Orders.EmployeeID) AND (Products.CategoryID = Categories.CategoryID) AND (Products.ProductID = Order_Details.ProductID) GROUP BY Categories.CategoryName, Employees.LastName HAVING (Employees.LastName =:LastName)");
levelChartInfo.setInParam(paramSet);
ColInfo levelOneChartColInfo = new ColInfo(-1, 0, -1, 2);
try {
rootChart.createDrillDownChart("TestDrillDownChart", QbChart.VIEW2D,
QbChart.COL, levelChartInfo, false, null,
levelOneChartColInfo, null, new int[] {0});
rootChart.updateDrillDownCharts();
} catch (Exception ex) { ex.printStackTrace(); }
return rootChart;
}When the above code is run as an applet or an application, it will produce a top-level chart shown below:
Generated top-level chart
Depending on the link clicked, you will see a chart similar to the one shown below:
Generated chart
Please note that this is a default chart that is generated without formatting of any kind.
When you generate parameter drill down charts without using the EspressManager, you MUST have a sub directory called drillTemplates under the working directory of the .class file.
Parameter drill down charts allow charts to be generated from different data sources. With data drill down, the same data source is used throughout the different levels of the charts. The top-level presents a summary of the data. You can click on a data point to bring up another chart showing some detailed information about that particular data point.
Only the column, bar, line, pie, area, overlay, radar, dial, stack column and stack bar supports the data drill down functionality.
To create a data drill down chart, you need to create a chart object first before specifying the drill down properties.
Given below is an example of a data drill down chart. The database against which the query is run is WoodView HSQL, so you will need to add database HSQL JDBC driver (hsqldb.jar) to your classpath. The driver is located in the <EspressChartInstall>/lib directory.
Component doDataDrillDownChart(Applet applet) {
//Do not use EspressManager
QbChart.setEspressManagerUsed(false);
// Begin Code : Creating Chart 1 - the Root Chart
DBInfo rootInfo = new DBInfo(
"jdbc:hsqldb:woodview",
"org.hsqldb.jdbcDriver",
"sa",
"",
"select Categories.CategoryName, Products.ProductName, Products.UnitsInStock from Categories, Products where Categories.CategoryID = Products.CategoryID order by Categories.CategoryName;");
ColInfo rootColInfo = new ColInfo();
rootColInfo.category = 0;
rootColInfo.value = 2;
QbChart chart = new QbChart(applet, QbChart.VIEW2D, QbChart.BAR, rootInfo, rootColInfo,
null);
// End Code : Creating Chart 1 - the Root Chart
try {
// Begin Code : Creating Chart 2 - the sub Chart
IDrillDown chartDrillDown = chart.gethDrillDown();
chartDrillDown.setAggregateOperator(IDrillDown.SUM); // Set the Aggregation
chartDrillDown.addDrillDown(QbChart.AREA, 1, -1, -1, true); // addDrillDown(chartType, category, series, sumby, is2DChart)
chartDrillDown.setDrillName("DrillDownChart"); // Set the drill template name
} catch (Exception ex)
{
ex.printStackTrace();
}
// End Code : Creating Chart 2 - the sub Chart
return chart;
}When the above code is run as an applet or an application, it will produce a top-level chart shown below:
Generated top-level chart
Depending on the link clicked, you will see a chart similar to the one shown below:
Generated chart
Please note that this is a default chart that is generated without formatting of any kind.
In data drill down charts, you have to pre-define the column-to-axis mapping for each drill down level. Dynamic data drill down gives you the flexibility to select the column-to-axis mapping for drill down charts when you are viewing the chart. Only the top-level summary chart needs to be built and the aggregation specified for the drill down.
Only the column, bar, line, pie, area, overlay, radar, dial, stack column and stack bar supports the dynamic data drill down functionality.
To create a dynamic data drill down chart, you need to create a chart object first before specifying the drill down properties.
Given below is an example of a data drill down chart. The database against which the query is run is WoodView HSQL, so you will need to add database HSQL JDBC driver (hsqldb.jar) to your classpath. The driver is located in the <EspressChartInstall>/lib directory.
Component doDynamicDataDrillDownChart(Applet applet) {
//Do not use EspressManager
QbChart.setEspressManagerUsed(false);
// Begin Code : Creating Chart 1 - the Root Chart
DBInfo rootInfo = new DBInfo(
"jdbc:hsqldb:woodview",
"org.hsqldb.jdbcDriver",
"sa",
"",
"select Categories.CategoryName, Products.ProductName, Products.UnitsInStock from Categories, Products where Categories.CategoryID = Products.CategoryID order by Categories.CategoryName;");
ColInfo rootColInfo = new ColInfo();
rootColInfo.category = 0;
rootColInfo.value = 2;
QbChart chart = new QbChart(applet, QbChart.VIEW2D, QbChart.BAR, rootInfo, rootColInfo,
null);
// End Code : Creating Chart 1 - the Root Chart
try {
// Begin Code : Creating Chart 2 - the sub Chart
IDrillDown chartDrillDown = chart.gethDrillDown();
chartDrillDown.setAggregateOperator(IDrillDown.SUM); // Set the Aggregation
chartDrillDown.setDynamicDrillDown(true); // Turn on dynamic data drill down
chartDrillDown.setDrillName("DynamicDrillDownChart"); // Set the drill template name
} catch (Exception ex) {
ex.printStackTrace();
}
// End Code : Creating Chart 2 - the sub Chart
return chart;
}When the above code is run as an applet or an application, it will produce a top-level chart shown below:
Generated chart
Depending on the link clicked, you will see a chart similar to the one shown below:
Generated chart
Please note that this is a default chart that is generated without formatting of any kind.