srcmini本文概述
GWT不包含用于创建图表的预安装存储库。我们可以从maven仓库下载它的仓库。在gwt中, 通过gwt图表工具（也称为Google Visualization）创建图表。
要设置GWT图表, 请执行以下步骤：
将gwt-charts.jar复制到现有项目或新项目中。
右键单击jar文件, 然后选择构建路径选项, 然后添加到构建路径选项。
要使用Maven存储库, 我们通过添加以下代码来更改XML文件：
<dependency>
<groupId>com.googlecode.gwt-charts</groupId>
<artifactId>gwt-charts</artifactId>
<version>0.9.10</version>
</dependency>GWT图表列表
- 注解
- 区域
- 酒吧
- 气泡
- 日历
- 烛台
- 地理图
- 直方图
- 地图
- 饼图等
GWT图表示例
在此代码中, 我们实现了面积图, 其中根据咖啡生产订单显示了面积。
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.ui.DockLayoutPanel;
import com.googlecode.gwt.charts.client.ChartLoader;
import com.googlecode.gwt.charts.client.ChartPackage;
import com.googlecode.gwt.charts.client.ColumnType;
import com.googlecode.gwt.charts.client.DataTable;
import com.googlecode.gwt.charts.client.corechart.AreaChart;
import com.googlecode.gwt.charts.client.corechart.AreaChartOptions;
import com.googlecode.gwt.charts.client.options.HAxis;
import com.googlecode.gwt.charts.client.options.VAxis;
public class AreaChartExample extends DockLayoutPanel {
private AreaChart chart;
public AreaChartExample() {
super(Unit.PX);
initialize();
}
private void initialize() {
ChartLoader chartLoader = new ChartLoader(ChartPackage.CORECHART);
chartLoader.loadApi(new Runnable() {
@Override
public void run() {
// Create and attach the chart
chart = new AreaChart();
add(chart);
draw();
}
});
}
private void draw() {
String[] countries = new String[]
{ "Bolivia", "Ecuador", "Madagascar", "Papua Guinea", "Rwanda" };
String[] months = new String[]
{ "2004/05", "2005/06", "2006/07", "2007/08", "2008/09" };
int[][] values = new int[][] {
{ 165, 135, 157, 139, 136 }, { 938, 1120, 1167, 1110, 691 }, { 522, 599, 587, 615, 629 }, { 998, 1268, 807, 968, 1026 }, { 450, 288, 397, 215, 366 } };
// Prepare the data
DataTable dataTable = DataTable.create();
dataTable.addColumn(ColumnType.STRING, "Year");
for (int i = 0; i < countries.length; i++) {
dataTable.addColumn(ColumnType.NUMBER, countries[i]);
}
dataTable.addRows(months.length);
for (int i = 0; i < months.length; i++) {
dataTable.setValue(i, 0, months[i]);
}
for (int col = 0; col < values.length; col++) {
for (int row = 0; row < values[col].length; row++) {
dataTable.setValue(row, col + 1, values[col][row]);
}
}
// Set options
AreaChartOptions options = AreaChartOptions.create();
options.setTitle("Monthly Coffee Production by Country");
options.setIsStacked(true);
options.setHAxis(HAxis.create("Cups"));
options.setVAxis(VAxis.create("Year"));
// Draw the chart
chart.draw(dataTable, options);
}
}输出：
GWT图表控件
GWT图表具有控制功能, 使图表创建可以位于不同的控制区域中。
以下是一些控件：
- 分类过滤器
- 图表范围过滤器
- 日期范围过滤器
- 号码范围过滤器
- 字符串过滤器
GWT图表示例
以下代码是“图表范围过滤器”的代码：
import com.google.gwt.dom.client.Style.Unit;
import com.google.gwt.user.client.ui.DockLayoutPanel;
import com.googlecode.gwt.charts.client.ChartLoader;
import com.googlecode.gwt.charts.client.ChartPackage;
import com.googlecode.gwt.charts.client.ChartType;
import com.googlecode.gwt.charts.client.ChartWrapper;
import com.googlecode.gwt.charts.client.ColumnType;
import com.googlecode.gwt.charts.client.DataTable;
import com.googlecode.gwt.charts.client.controls.Dashboard;
import com.googlecode.gwt.charts.client.controls.filter.ChartRangeFilter;
import com.googlecode.gwt.charts.client.controls.filter.ChartRangeFilterOptions;
import com.googlecode.gwt.charts.client.controls.filter.ChartRangeFilterState;
import com.googlecode.gwt.charts.client.controls.filter.ChartRangeFilterStateRange;
import com.googlecode.gwt.charts.client.controls.filter.ChartRangeFilterUi;
import com.googlecode.gwt.charts.client.corechart.LineChartOptions;
import com.googlecode.gwt.charts.client.options.ChartArea;
import com.googlecode.gwt.charts.client.options.Legend;
import com.googlecode.gwt.charts.client.options.LegendPosition;
import com.googlecode.gwt.charts.showcase.client.util.DateUtils;
public class ChartRangeFilterExample extends DockLayoutPanel {
private Dashboard dashboard;
private ChartWrapper<LineChartOptions> lineChart;
private ChartRangeFilter numberRangeFilter;
public ChartRangeFilterExample() {
super(Unit.PX);
initialize();
}
private void initialize() {
ChartLoader chartLoader = new ChartLoader(ChartPackage.CONTROLS);
chartLoader.loadApi(new Runnable() {
@Override
public void run() {
addNorth(getDashboardWidget(), 0);
addSouth(getNumberRangeFilter(), 100);
add(getLineChart());
draw();
}
});
}
private Dashboard getDashboardWidget() {
if (dashboard == null) {
dashboard = new Dashboard();
}
return dashboard;
}
private ChartWrapper<LineChartOptions> getLineChart() {
if (lineChart == null) {
lineChart = new ChartWrapper<LineChartOptions>();
lineChart.setChartType(ChartType.LINE);
}
return lineChart;
}
private ChartRangeFilter getNumberRangeFilter() {
if (numberRangeFilter == null) {
numberRangeFilter = new ChartRangeFilter();
}
return numberRangeFilter;
}
private void draw() {
// Set control options
ChartRangeFilterOptions chartRangeFilterOptions = ChartRangeFilterOptions.create();
chartRangeFilterOptions.setFilterColumnIndex(0); // Filter by the date axis
LineChartOptions controlChartOptions = LineChartOptions.create();
controlChartOptions.setHeight(100);
ChartArea chartArea = ChartArea.create();
chartArea.setWidth("90%");
chartArea.setHeight("90%");
controlChartOptions.setChartArea(chartArea);
ChartRangeFilterUi chartRangeFilterUi = ChartRangeFilterUi.create();
chartRangeFilterUi.setChartType(ChartType.LINE);
chartRangeFilterUi.setChartOptions(controlChartOptions);
chartRangeFilterUi.setMinRangeSize(2 * 24 * 60 * 60 * 1000); // 2 days in milliseconds
chartRangeFilterOptions.setUi(chartRangeFilterUi);
ChartRangeFilterStateRange stateRange = ChartRangeFilterStateRange.create();
stateRange.setStart(DateUtils.create(2012, 2, 9));
stateRange.setEnd(DateUtils.create(2012, 3, 20));
ChartRangeFilterState controlState = ChartRangeFilterState.create();
controlState.setRange(stateRange);
numberRangeFilter.setState(controlState);
numberRangeFilter.setOptions(chartRangeFilterOptions);
// Set chart options
LineChartOptions lineChartOptions = LineChartOptions.create();
lineChartOptions.setLineWidth(3);
lineChartOptions.setLegend(Legend.create(LegendPosition.NONE));
lineChartOptions.setChartArea(chartArea);
lineChart.setOptions(lineChartOptions);
// Generate random data
DataTable dataTable = DataTable.create();
dataTable.addColumn(ColumnType.DATE, "Date");
dataTable.addColumn(ColumnType.NUMBER, "Stock value");
dataTable.addRows(121);
double open, close = 300;
double low, high;
for (int day = 1; day < 121; ++day) {
double change = (Math.sin(day / 2.5 + Math.PI) + Math.sin(day / 3) - Math.cos(day * 0.7)) * 150;
change = change >= 0 ? change + 10 : change - 10;
open = close;
close = Math.max(50, open + change);
low = Math.min(open, close) - (Math.cos(day * 1.7) + 1) * 15;
low = Math.max(0, low);
high = Math.max(open, close) + (Math.cos(day * 1.3) + 1) * 15;
dataTable.setValue(day, 0, DateUtils.create(2012, 1, day));
dataTable.setValue(day, 1, Math.round(high));
}
// Draw the chart
dashboard.bind(numberRangeFilter, lineChart);
dashboard.draw(dataTable);
}
}输出：
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