私は比較的長いダイアグラムを表示したいです。私はJavaFXのキャンバスでの作業に使用されるが、描かれた多くの値にあるとき、時々私は、バッファオーバーフロー例外を取得します。私は別のアプローチを探しているとjava.awt.graphics2dで図を描画する方法を見つけました。Graphics2Dを使っ利点は、パフォーマンスが向上していることであり、私は例外を得ることはありません。欠点は、図の品質です。Graphics2Dを使った図は、ように見えないJavaFXのキャンバスでの図として滑らか。
ここで、正弦波が描かれている2つのテストアプリケーション(JavaFXのキャンバスを有するものとjava.awt.graphics2d有するもの)。
どのように私はそれがキャンバスの例のように見えるように、Graphics2Dの例の品質を向上させることができますか?それとも別のアプローチは、私は私の問題を解決することを考えていないことがありますか?
キャンバス例
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();
}
}
NEW Graphics2Dの例
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();
}
}
EDITこれはバッファオーバーフローの例外は次のようになります。
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)
EDIT 2:私は、Graphics2Dの描画の品質を改善する方法を発見しました。Graphics2Dオブジェクトの描画ヒント(アドバイスをあなたにHylian Pickachuに感謝)を設定することにより、正弦曲線が滑らかに見えます。これは、キャンバスの例では、正弦曲線のように鋭いようではありませんが、私は今、結果と一緒に暮らすことができると思います。
Graphics2Dの品質を改善する一つの方法は、使用しているRenderingHints内を。RenderingHints内では、あなたがキャンバス上のGraphics2Dを使用してから、パフォーマンスの向上を享受なかったと言ったように、考慮すべきトレードオフであるパフォーマンスを、レンダリングの対レンダリング品質のバランスを設定することができます。しかし、このアプローチは、あなたがGraphics2Dのと回避クラッシュを引き続き使用することができます。