javafx画布绘制与java. awt.graph ics2d绘制的比较

提问者：小点点

javafx画布绘制与java. awt.graph ics2d绘制的比较

我想显示一个相对较长的图表。我曾经使用javafx画布，但有时我会得到一个缓冲区溢出异常，当绘制了许多值时。我正在寻找一种不同的方法，并找到了一种使用java. awt.graph ics2d绘制图表的方法。使用graph ics2d的优点是性能提高了，我没有得到异常。缺点是图表的质量。使用graph ics2d，图表看起来不像javafx画布中的图表那么流畅。

这里有一个两个测试应用程序（一个使用javafx画布，一个使用java. awt.graph ics2d），其中绘制了正弦波。

我如何才能提高graph ics2d示例的质量，使其看起来像画布示例？或者有没有一种我没有想到的不同方法可以解决我的问题？

画布示例

public class CanvasDraw extends Application
{
    private static final int PANEL_WIDTH = 400, PANEL_HEIGHT = 100;


    public static void main(String[] args)
    {
        launch(args);
    }


    @Override
    public void start(Stage stage)
    {
        stage.setTitle("CanvasDraw");
        StackPane root = new StackPane();
        Scene scene = new Scene(root);
        root.getChildren().add(createCanvas());
        stage.setScene(scene);
        stage.show();
    }


    private Canvas createCanvas()
    {
        Canvas canvas = new Canvas(PANEL_WIDTH, PANEL_HEIGHT);
        GraphicsContext gc = canvas.getGraphicsContext2D();
        drawSinus(gc);
        return canvas;
    }


    private void drawSinus(GraphicsContext gc)
    {
        double height = 50;
        double xFactor = 0.5;
        double yFactor = 50;
        for (int index = 0; index < 720; index++)
        {
            double x = index * xFactor;
            double y = Math.sin(Math.toRadians(index)) * yFactor + height;
            if (index == 0)
            {
                gc.moveTo(x, y);
            }
            else
            {
                gc.lineTo(x, y);
            }
        }
        gc.stroke();
    }
}

新图形2D示例

public class Graphics2DDraw extends Application
{
    private static final int PANEL_WIDTH = 400, PANEL_HEIGHT = 100;


    public static void main(String[] args)
    {
        launch(args);
    }


    @Override
    public void start(Stage stage)
    {
        stage.setTitle("Graphics2DDraw");
        StackPane root = new StackPane();
        Scene scene = new Scene(root);
        root.getChildren().add(createImageView());
        stage.setScene(scene);
        stage.show();
    }


    private ImageView createImageView()
    {
        BufferedImage bi = new BufferedImage(PANEL_WIDTH, PANEL_HEIGHT, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g = bi.createGraphics();
        g.setColor(Color.BLACK);
        BasicStroke bs = new BasicStroke(1f, BasicStroke.CAP_ROUND, BasicStroke.JOIN_ROUND);
        g.setStroke(bs);
        g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
        g.setRenderingHint(RenderingHints.KEY_RENDERING, RenderingHints.VALUE_RENDER_SPEED);
        g.setRenderingHint(RenderingHints.KEY_STROKE_CONTROL, RenderingHints.VALUE_STROKE_PURE);
        drawSinus(g);
        return new ImageView(SwingFXUtils.toFXImage(bi, null));
    }


    private void drawSinus(Graphics2D g)
    {
        double height = 50;
        double xFactor = 0.5;
        double yFactor = 50;
        int length = 720;
        int lastX = 0;
        int lastY = 0;
        GeneralPath path = new GeneralPath();
        for (int index = 0; index < length; index++)
        {
            double x3 = index * xFactor;
            double y3 = Math.sin(Math.toRadians(index)) * yFactor + height;
            if (index == 0)
            {
                path.moveTo(x3, y3);
            }
            else
            {
                path.lineTo(x3, y3);
            }
        }
        g.draw(path);
        g.dispose();
    }
}

编辑这是缓冲区溢出异常的样子：

java.nio.BufferOverflowException
    at com.sun.javafx.sg.prism.GrowableDataBuffer.ensureReadCapacity(GrowableDataBuffer.java:317)
    at com.sun.javafx.sg.prism.GrowableDataBuffer.getInt(GrowableDataBuffer.java:527)
    at com.sun.javafx.sg.prism.GrowableDataBuffer.getFloat(GrowableDataBuffer.java:563)
    at com.sun.javafx.sg.prism.NGCanvas.renderStream(NGCanvas.java:960)
    at com.sun.javafx.sg.prism.NGCanvas.renderContent(NGCanvas.java:609)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:477)
    at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:330)
    at com.sun.javafx.tk.quantum.UploadingPainter.run(UploadingPainter.java:134)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
    at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
    at java.lang.Thread.run(Thread.java:748)
java.lang.IllegalArgumentException: ALPHA color component is out of range
    at com.sun.pisces.PiscesRenderer.checkColorRange(PiscesRenderer.java:113)
    at com.sun.pisces.PiscesRenderer.setColor(PiscesRenderer.java:105)
    at com.sun.prism.sw.SWPaint.setColor(SWPaint.java:76)
    at com.sun.prism.sw.SWPaint.setPaintBeforeDraw(SWPaint.java:118)
    at com.sun.prism.sw.SWPaint.setPaintFromShape(SWPaint.java:86)
    at com.sun.prism.sw.SWGraphics.paintShape(SWGraphics.java:493)
    at com.sun.prism.sw.SWGraphics.drawLine(SWGraphics.java:545)
    at com.sun.javafx.sg.prism.NGCanvas.handleRenderOp(NGCanvas.java:1219)
    at com.sun.javafx.sg.prism.NGCanvas.renderStream(NGCanvas.java:1103)
    at com.sun.javafx.sg.prism.NGCanvas.renderContent(NGCanvas.java:609)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.sg.prism.NGGroup.renderContent(NGGroup.java:235)
    at com.sun.javafx.sg.prism.NGRegion.renderContent(NGRegion.java:577)
    at com.sun.javafx.sg.prism.NGNode.doRender(NGNode.java:2053)
    at com.sun.javafx.sg.prism.NGNode.render(NGNode.java:1945)
    at com.sun.javafx.tk.quantum.ViewPainter.doPaint(ViewPainter.java:477)
    at com.sun.javafx.tk.quantum.ViewPainter.paintImpl(ViewPainter.java:330)
    at com.sun.javafx.tk.quantum.UploadingPainter.run(UploadingPainter.java:134)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
    at com.sun.javafx.tk.RenderJob.run(RenderJob.java:58)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at com.sun.javafx.tk.quantum.QuantumRenderer$PipelineRunnable.run(QuantumRenderer.java:125)
    at java.lang.Thread.run(Thread.java:748)

编辑2：我找到了一种方法来提高graph ics2d绘图的质量。通过为graph ics2d对象设置渲染提示（谢谢海利安·皮卡丘的建议），正弦曲线看起来更平滑。它不像画布示例中的正弦曲线那么清晰，但我想我现在可以接受结果了。

共1个答案

匿名用户

提高Graphics2D质量的一种方法是使用RenderingHint。RenderingHint允许您设置渲染质量与渲染性能的平衡，这是一个需要考虑的权衡，正如您所说，您确实喜欢使用Graphics2D而不是Canvas带来的性能提升。但是，这种方法将允许您继续使用Graphics2D并避免崩溃。