Java JFreeChart简单绘图(抛物线)
我用JFreeChart写了一个简单的抛物线图Java JFreeChart简单绘图(抛物线),java,jfreechart,Java,Jfreechart,我用JFreeChart写了一个简单的抛物线图 package parabolademo; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; import org.jfree.chart.ChartFactory; import org.jfree.chart.ChartMouseEvent; import org.jfree.chart.ChartMouseListener; import org.jfree.ch
package parabolademo;
import java.awt.geom.Point2D;
import java.awt.geom.Rectangle2D;
import org.jfree.chart.ChartFactory;
import org.jfree.chart.ChartMouseEvent;
import org.jfree.chart.ChartMouseListener;
import org.jfree.chart.ChartPanel;
import org.jfree.chart.JFreeChart;
import org.jfree.chart.plot.PlotOrientation;
import org.jfree.chart.plot.XYPlot;
import org.jfree.data.function.Function2D;
import org.jfree.data.function.PolynomialFunction2D;
import org.jfree.data.general.DatasetUtilities;
import org.jfree.data.xy.XYDataset;
import org.jfree.ui.ApplicationFrame;
import org.jfree.ui.RefineryUtilities;
public class ParabolaDemo extends ApplicationFrame {
/*
* @param title the frame title.
*/
public ParabolaDemo(final String title) {
super(title);
double[] a = {0.0, 0.0, 3.0};
Function2D p = new PolynomialFunction2D(a);
XYDataset dataset = DatasetUtilities.sampleFunction2D(p, -20.0, 20.0, 100, "Function");
final JFreeChart chart = ChartFactory.createXYLineChart(
"Parabola",
"X",
"Y",
dataset,
PlotOrientation.VERTICAL,
true,
true,
false
);
final ChartPanel chartPanel = new ChartPanel(chart);
chartPanel.addChartMouseListener(new ChartMouseListener() {
@Override
public void chartMouseClicked(ChartMouseEvent cme) {
Point2D po = chartPanel.translateScreenToJava2D(cme.getTrigger().getPoint());
Rectangle2D plotArea = chartPanel.getScreenDataArea();
XYPlot plot = (XYPlot) chart.getPlot(); // your plot
double chartX = plot.getDomainAxis().java2DToValue(po.getX(), plotArea, plot.getDomainAxisEdge());
double chartY = plot.getRangeAxis().java2DToValue(po.getY(), plotArea, plot.getRangeAxisEdge());
System.out.println("Clicked!");
System.out.println("X:" + chartX + ", Y:" + chartY);
}
@Override
public void chartMouseMoved(ChartMouseEvent cme) {
}
});
chartPanel.setPreferredSize(new java.awt.Dimension(500, 270));
setContentPane(chartPanel);
}
public static void main(final String[] args) {
final ParabolaDemo demo = new ParabolaDemo("Parabola Plot Demo");
demo.pack();
RefineryUtilities.centerFrameOnScreen(demo);
demo.setVisible(true);
}
}
如何获取函数绘图点的坐标(my chartMouseListener获取窗口中任意点的坐标)?用户移动鼠标并释放鼠标按钮后如何接收点坐标?
我希望在单击鼠标时,绘图点跟随鼠标,因此将重建绘图(为此,有必要再次计算系数,知道此坐标并使用任何2个其他坐标)。如何做到这一点?如何使用新系数重建绘图?给定名为
cmd
的ChartMouseEvent
,忽略除XYItemEntity
以外的任何类型的实体。一旦知道了实体,不要插值,只需查询数据集即可
ChartEntity ce = cme.getEntity();
if (ce instanceof XYItemEntity) {
XYItemEntity e = (XYItemEntity) ce;
XYDataset d = e.getDataset();
int s = e.getSeriesIndex();
int i = e.getItem();
System.out.println("X:" + d.getX(s, i) + ", Y:" + d.getY(s, i));
}
也应考虑在图的渲染器上调用<代码> SETBASESHAPEXECUTIVE(TRUE)。< P>给出了<代码> CARTHOMSEEVENG/<代码>命名<代码> CMD> /Cord>,忽略除<代码> XYItemEntity < /C>以外的任何类型的实体。一旦知道了实体,不要插值,只需查询数据集即可
ChartEntity ce = cme.getEntity();
if (ce instanceof XYItemEntity) {
XYItemEntity e = (XYItemEntity) ce;
XYDataset d = e.getDataset();
int s = e.getSeriesIndex();
int i = e.getItem();
System.out.println("X:" + d.getX(s, i) + ", Y:" + d.getY(s, i));
}
也考虑在代码的渲染器上调用<代码> StasBaseHeSeCultEdvices(true)< /C>。释放鼠标按钮后有没有办法获得点坐标?chartMouseMoved在按下鼠标按钮时不起作用。谢谢,它起作用了!释放鼠标按钮后有没有办法获得点坐标?按下鼠标按钮时,chartMouseMoved不起作用。