Java SWTChart鼠标事件处理
我发现并只是想知道如何用鼠标在x轴上选择一个范围，例如1到3，然后我会得到属于所选x值的所有y轴值Java SWTChart鼠标事件处理,java,swt,mouseevent,swtchart,Java,Swt,Mouseevent,Swtchart,我发现并只是想知道如何用鼠标在x轴上选择一个范围，例如1到3，然后我会得到属于所选x值的所有y轴值 （来源：） 在上面的示例中，如何包含用于选择范围的鼠标事件 提前感谢您。下面的代码应该会让您了解如何做到这一点。基本上，您必须获取图表的图表区域，添加SWT.MouseDown和SWT.MouseUp的侦听器，并记住这两个事件的位置。回答您的评论：是的，您可以使用SWT.Paint侦听器添加“突出显示”功能 import org.eclipse.swt.SWT; import org.eclip
（来源：） 在上面的示例中，如何包含用于选择范围的鼠标事件
提前感谢您。下面的代码应该会让您了解如何做到这一点。基本上，您必须获取
图表的图表区域
，添加SWT.MouseDown
和SWT.MouseUp
的侦听器，并记住这两个事件的位置。回答您的评论：是的，您可以使用SWT.Paint
侦听器添加“突出显示”功能
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.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 location point of mouse down */
private static double startX;
private static double startY;
private static int startXPos;
private static int startYPos;
private static int currentX;
private static int currentY;
private static boolean drag = false;
/**
* 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
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.MouseDown, new Listener() {
@Override
public void handleEvent(Event event) {
IAxis xAxis = chart.getAxisSet().getXAxis(0);
IAxis yAxis = chart.getAxisSet().getYAxis(0);
startX = xAxis.getDataCoordinate(event.x);
startY = yAxis.getDataCoordinate(event.y);
startXPos = event.x;
startYPos = event.y;
drag = true;
}
});
plotArea.addListener(SWT.MouseUp, new Listener() {
@Override
public void handleEvent(Event event) {
IAxis xAxis = chart.getAxisSet().getXAxis(0);
IAxis yAxis = chart.getAxisSet().getYAxis(0);
double endX = xAxis.getDataCoordinate(event.x);
double endY = yAxis.getDataCoordinate(event.y);
System.out.println(startX + " " + endX);
System.out.println(startY + " " + endY);
drag = false;
plotArea.redraw();
}
});
plotArea.addListener(SWT.MouseMove, new Listener() {
@Override
public void handleEvent(Event event) {
if(drag)
{
currentX = event.x;
currentY = event.y;
plotArea.redraw();
}
}
});
plotArea.addListener(SWT.Paint, new Listener() {
@Override
public void handleEvent(Event event) {
if(drag)
{
GC gc = event.gc;
gc.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_RED));
gc.setAlpha(128);
int minX = Math.min(startXPos, currentX);
int minY = Math.min(startYPos, currentY);
int maxX = Math.max(startXPos, currentX);
int maxY = Math.max(startYPos, currentY);
int width = maxX - minX;
int height = maxY - minY;
gc.fillRectangle(minX, minY, width, height);
}
}
});
return chart;
}
}
下面的代码应该让您了解如何做到这一点。基本上，您必须获取图表的图表区域
，添加SWT.MouseDown
和SWT.MouseUp
的侦听器，并记住这两个事件的位置。回答您的评论：是的，您可以使用SWT.Paint
侦听器添加“突出显示”功能
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.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 location point of mouse down */
private static double startX;
private static double startY;
private static int startXPos;
private static int startYPos;
private static int currentX;
private static int currentY;
private static boolean drag = false;
/**
* 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
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.MouseDown, new Listener() {
@Override
public void handleEvent(Event event) {
IAxis xAxis = chart.getAxisSet().getXAxis(0);
IAxis yAxis = chart.getAxisSet().getYAxis(0);
startX = xAxis.getDataCoordinate(event.x);
startY = yAxis.getDataCoordinate(event.y);
startXPos = event.x;
startYPos = event.y;
drag = true;
}
});
plotArea.addListener(SWT.MouseUp, new Listener() {
@Override
public void handleEvent(Event event) {
IAxis xAxis = chart.getAxisSet().getXAxis(0);
IAxis yAxis = chart.getAxisSet().getYAxis(0);
double endX = xAxis.getDataCoordinate(event.x);
double endY = yAxis.getDataCoordinate(event.y);
System.out.println(startX + " " + endX);
System.out.println(startY + " " + endY);
drag = false;
plotArea.redraw();
}
});
plotArea.addListener(SWT.MouseMove, new Listener() {
@Override
public void handleEvent(Event event) {
if(drag)
{
currentX = event.x;
currentY = event.y;
plotArea.redraw();
}
}
});
plotArea.addListener(SWT.Paint, new Listener() {
@Override
public void handleEvent(Event event) {
if(drag)
{
GC gc = event.gc;
gc.setBackground(Display.getDefault().getSystemColor(SWT.COLOR_RED));
gc.setAlpha(128);
int minX = Math.min(startXPos, currentX);
int minY = Math.min(startYPos, currentY);
int maxX = Math.max(startXPos, currentX);
int maxY = Math.max(startYPos, currentY);
int width = maxX - minX;
int height = maxY - minY;
gc.fillRectangle(minX, minY, width, height);
}
}
});
return chart;
}
}
谢谢，它正在工作。是否可以使突出显示可见！？谢谢，它正在工作。是否可以使突出显示可见！？