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我找到了 SWTChart library只是想知道如何用鼠标浏览下图并获得包含有关 y 值信息的框,如 example 中所示.
(来源:swtchart.org)
package org.swtchart.examples;
import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.swtchart.Chart;
import org.swtchart.ILineSeries;
import org.swtchart.ISeries.SeriesType;
/**
* An example for area chart.
*/
public class AreaChartExample {
private static final double[] ySeries1 = { 0.1, 0.38, 0.71, 0.92, 1.0 };
private static final double[] ySeries2 = { 1.2, 3.53, 3.1, 0.1, 0.5 };
/**
* The main method.
*
* @param args
* the arguments
*/
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Area Chart");
shell.setSize(500, 400);
shell.setLayout(new FillLayout());
createChart(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
/**
* create the chart.
*
* @param parent
* The parent composite
* @return The created chart
*/
static public Chart createChart(Composite parent) {
// create a chart
Chart chart = new Chart(parent, SWT.NONE);
// set titles
chart.getTitle().setText("Area Chart");
// create line series
ILineSeries lineSeries1 = (ILineSeries) chart.getSeriesSet()
.createSeries(SeriesType.LINE, "line series 1");
lineSeries1.setYSeries(ySeries1);
lineSeries1.setLineColor(Display.getDefault().getSystemColor(
SWT.COLOR_RED));
lineSeries1.enableArea(true);
ILineSeries lineSeries2 = (ILineSeries) chart.getSeriesSet()
.createSeries(SeriesType.LINE, "line series 2");
lineSeries2.setYSeries(ySeries2);
lineSeries2.enableArea(true);
// adjust the axis range
chart.getAxisSet().adjustRange();
return chart;
}
}
如上例所示,如何包含鼠标事件以打开具有 y 值的框?
提前谢谢你。
最佳答案
开始工作了。我的代码将搜索距离鼠标位置最近的数据点,在工具提示中显示其坐标并在图中突出显示数据点:
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.swtchart.Chart;
import org.swtchart.IAxis;
import org.swtchart.ILineSeries;
import org.swtchart.ISeries;
import org.swtchart.ISeries.SeriesType;
/**
* An example for area chart.
*/
public class AreaChartExample {
private static final double[] ySeries1 = { 0.1, 0.38, 0.71, 0.92, 1.0 };
private static final double[] ySeries2 = { 1.2, 3.53, 3.1, 0.1, 0.5 };
/* Used to remember the location of the highlight point */
private static int highlightX;
private static int highlightY;
/**
* The main method.
*
* @param args
* the arguments
*/
public static void main(String[] args) {
Display display = new Display();
Shell shell = new Shell(display);
shell.setText("Area Chart");
shell.setSize(500, 400);
shell.setLayout(new FillLayout());
createChart(shell);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch()) {
display.sleep();
}
}
display.dispose();
}
protected static boolean highlight;
/**
* create the chart.
*
* @param parent
* The parent composite
* @return The created chart
*/
static public Chart createChart(Composite parent) {
// create a chart
final Chart chart = new Chart(parent, SWT.NONE);
// set titles
chart.getTitle().setText("Area Chart");
// create line series
ILineSeries lineSeries1 = (ILineSeries) chart.getSeriesSet()
.createSeries(SeriesType.LINE, "line series 1");
lineSeries1.setYSeries(ySeries1);
lineSeries1.setLineColor(Display.getDefault().getSystemColor(
SWT.COLOR_RED));
lineSeries1.enableArea(true);
ILineSeries lineSeries2 = (ILineSeries) chart.getSeriesSet()
.createSeries(SeriesType.LINE, "line series 2");
lineSeries2.setYSeries(ySeries2);
lineSeries2.enableArea(true);
// adjust the axis range
chart.getAxisSet().adjustRange();
/* Get the plot area and add the mouse listeners */
final Composite plotArea = chart.getPlotArea();
plotArea.addListener(SWT.MouseHover, new Listener() {
@Override
public void handleEvent(Event event) {
IAxis xAxis = chart.getAxisSet().getXAxis(0);
IAxis yAxis = chart.getAxisSet().getYAxis(0);
double x = xAxis.getDataCoordinate(event.x);
double y = yAxis.getDataCoordinate(event.y);
ISeries[] series = chart.getSeriesSet().getSeries();
double closestX = 0;
double closestY = 0;
double minDist = Double.MAX_VALUE;
/* over all series */
for (ISeries serie : series) {
double[] xS = serie.getXSeries();
double[] yS = serie.getYSeries();
/* check all data points */
for (int i = 0; i < xS.length; i++) {
/* compute distance to mouse position */
double newDist = Math.sqrt(Math.pow((x - xS[i]), 2)
+ Math.pow((y - yS[i]), 2));
/* if closer to mouse, remember */
if (newDist < minDist) {
minDist = newDist;
closestX = xS[i];
closestY = yS[i];
}
}
}
/* set tooltip of closest data point */
plotArea.setToolTipText(closestX + " " + closestY);
/* remember closest data point */
highlightX = xAxis.getPixelCoordinate(closestX);
highlightY = yAxis.getPixelCoordinate(closestY);
highlight = true;
/* trigger repaint (paint highlight) */
plotArea.redraw();
}
});
plotArea.addListener(SWT.MouseMove, new Listener() {
@Override
public void handleEvent(Event arg0) {
highlight = false;
plotArea.redraw();
}
});
plotArea.addListener(SWT.Paint, new Listener() {
@Override
public void handleEvent(Event event) {
if (highlight) {
GC gc = event.gc;
gc.setBackground(Display.getDefault().getSystemColor(
SWT.COLOR_RED));
gc.setAlpha(128);
gc.fillOval(highlightX - 5, highlightY - 5, 10, 10);
}
}
});
return chart;
}
}
结果是这样的:
关于java - SWTChart 鼠标悬停处理,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/12491321/
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