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POJava JFreeChart - plot isn't updated
 

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  1. POJava JFreeChart - plot isn't updated
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    <p>Plot of parabola isn't updated, when I calculate new coefficients of parabola. New coefficients of a parabola are calculated when the mouse is зкуыыув and moves. New coefficients on a graphics are displayed, but the plot remains the same. Why so?</p> <pre><code>package parabolademo; import java.awt.Rectangle; import java.awt.event.MouseEvent; import java.awt.event.MouseMotionListener; import java.awt.geom.Point2D; import java.awt.geom.Rectangle2D; import org.apache.commons.math3.linear.Array2DRowRealMatrix; import org.apache.commons.math3.linear.ArrayRealVector; import org.apache.commons.math3.linear.DecompositionSolver; import org.apache.commons.math3.linear.LUDecomposition; import org.apache.commons.math3.linear.RealMatrix; import org.apache.commons.math3.linear.RealVector; 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.entity.ChartEntity; import org.jfree.chart.entity.XYItemEntity; import org.jfree.chart.plot.PlotOrientation; import org.jfree.chart.plot.XYPlot; import org.jfree.chart.renderer.xy.XYLineAndShapeRenderer; 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. */ int flag = 0; double px = 0.0, py = 0.0, chartpx = 0.0, chartpy = 0.0, chartX = 0.0, chartY = 0.0; int windowheight = 270; ChartPanel chartPanel; PolynomialFunction2D p; XYPlot plot; double lrange = -20.0; double rrange = 20.0; double[] a; public ParabolaDemo(final String title) { super(title); double[] tmp = {0.0, 0.0, 1.0}; a = tmp; p = new PolynomialFunction2D(a); XYDataset dataset = DatasetUtilities.sampleFunction2D(p, lrange, rrange, 20, "y = f(x)"); final JFreeChart chart = ChartFactory.createXYLineChart( "Parabola", "X", "Y", dataset, PlotOrientation.VERTICAL, true, true, false ); plot = (XYPlot) chart.getPlot(); XYLineAndShapeRenderer render = (XYLineAndShapeRenderer) plot.getRenderer(); render.setBaseShapesVisible(true); render.setSeriesShape(0, new Rectangle(-6, -6, 12, 12)); chartPanel = new ChartPanel(chart); chartPanel.addMouseMotionListener(new MotionListener()); chartPanel.addChartMouseListener(new ChartMouseListener() { @Override public void chartMouseClicked(ChartMouseEvent cme) { } @Override public void chartMouseMoved(ChartMouseEvent cme) { ChartEntity ce = cme.getEntity(); if (ce instanceof XYItemEntity) { flag = 1; XYItemEntity e = (XYItemEntity) ce; XYDataset d = ((XYItemEntity) ce).getDataset(); int i = ((XYItemEntity) ce).getItem(); chartpx = d.getXValue(0, i); chartpy = d.getYValue(0, i); //System.out.println("X:" + chartpx + ", Y:" + chartpy); } else flag = 0; Point2D po = chartPanel.translateScreenToJava2D(cme.getTrigger().getPoint()); Rectangle2D plotArea = chartPanel.getScreenDataArea(); XYPlot plot = (XYPlot) chart.getPlot(); // your plot chartX = plot.getDomainAxis().java2DToValue(po.getX(), plotArea, plot.getDomainAxisEdge()); chartY = plot.getRangeAxis().java2DToValue(po.getY(), plotArea, plot.getRangeAxisEdge()); //System.out.println("X:" + chartX + ", Y:" + chartY); } }); chartPanel.setPreferredSize(new java.awt.Dimension(500, windowheight)); chartPanel.setDomainZoomable(false); chartPanel.setRangeZoomable(false); 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); } public class MotionListener implements MouseMotionListener { @Override public void mouseDragged(MouseEvent me) { double dx = me.getX(); double dy = windowheight - me.getY(); double graphx, graphy; if (dx &lt; 83) dx = 83; else if (dx &gt; 468) dx = 468; if (dy &lt; 74) dy = 74; else if (dy &gt; 468) dy = 468; dx -= 83; dy -= 74; graphx = 40.0 / 385.0 * dx - 20; graphy = 400.0 / 153.0 * dy; if (flag == 1) { //System.out.println("Dragged! x = " + dx + ", y = " + dy + ", xplot = " + graphx + ", yplot = " + graphy); } a = calculate(graphx, graphy); plot.setDataset(createDataset(a)); } @Override public void mouseMoved(MouseEvent me) { } } private double[] calculate(double x, double y) { double px1, px2, py1, py2; double[] coef; coef = p.getCoefficients(); if (x == (-coef[1])/2*coef[2]) { px1 = lrange; py1 = p.getValue(px1); px2 = rrange; py2 = p.getValue(px2); } else if (x == lrange) { px1 = (-coef[1])/2*coef[2]; py1 = p.getValue(px1); px2 = rrange; py2 = p.getValue(px2); } else if (x == rrange) { px1 = lrange; py1 = p.getValue(px1); px2 = (-coef[1])/2*coef[0]; py2 = p.getValue(px2); } else if (x &gt; (-coef[1])/2*coef[2]){ px1 = lrange; py1 = p.getValue(px1); px2 = (-coef[1])/2*coef[2]; py2 = p.getValue(px2); } else { px1 = (-coef[1])/2*coef[2]; py1 = p.getValue(px1); px2 = rrange; py2 = p.getValue(px2); } System.out.println("("+px1+","+py1+") ("+px2+","+py2+") ("+x+","+y+")"); RealMatrix coefficients = new Array2DRowRealMatrix(new double[][] { { px1*px1, px1, 1 }, { px2*px2, px2, 1 }, { x*x, x, 1 } }, false); DecompositionSolver solver = new LUDecomposition(coefficients).getSolver(); RealVector constants = new ArrayRealVector(new double[] { py1, py2, y }, false); RealVector solution = solver.solve(constants); coef[2] = solution.getEntry(0); coef[1] = solution.getEntry(1); coef[0] = solution.getEntry(2); System.out.println(coef[0] + ", " + coef[1] + ", " + coef[2]); return coef; } private XYDataset createDataset(double[] a) { double[] array = a; return DatasetUtilities.sampleFunction2D( p, -20.0, 20.0, 20, "y = " + array[2] + "x²+" + array[1] + "x+" + array[0] + " {-20…20}"); } } </code></pre>
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