Question

我需要在JavaFX Canvas上每秒30次从10K到15K的多边形绘制。我创建了不同的Thread，它创建了新的Canvas对象，绘制了它所需的一切，并在Application UI线程中替换了Canvas。但遗憾的是，由于通过调用方法

绘制多边形，因此工作缓慢

graphicsContext.fillPolygon(xPoints, yPoints, len);

有没有办法提高绘图速度？

所以绘图线程：

public class RMapFXView implements Runnable {
private final static int FPS = 30;
private final RMapModel mapModel;
private final RMapController controller;

public RMapFXView(RMapModel mapModel, RMapController controller) {
    this.mapModel = mapModel;
    this.controller = controller;
}

private Canvas draw(){
    Canvas bufCanvas = new Canvas(controller.getWidth(), controller.getHeight());
    GraphicsContext context = bufCanvas.getGraphicsContext2D();
    //getting the objects to draw
    Map<Integer, List<RObject>> visibleLayers = mapModel.getVisibleObjects();
    MBR mapMBR = mapModel.getVisibleMBR();

    for (Integer i: visibleLayers.keySet()){
        List<RObject> layer = visibleLayers.get(i);
        for(RObject o: layer){
            int start = o.getStartPoint();
            int end = o.getEndPoint();
            double[] xPoints = new double[end - start + 1];
            double[] yPoints = new double[end - start + 1];
            //filling the xPoints and yPoints, setting the fill color, stroke color and so on
            if (o.isClosed()) {
                context.fillPolygon(xPoints, yPoints, xPoints.length);
            } else {
                context.strokePolyline(xPoints, yPoints, xPoints.length);
            }
        }

        context.fillText("" + layer.size(), 10, (i+ 2) * 10);
    }

    return bufCanvas;
}

@Override
public void run() {
    while (!Thread.interrupted()){
        long startTime = System.nanoTime();
        //replacing current canvas
        controller.setMapCanvas(draw());
        long endTime = System.nanoTime();

        long sleepTime = (TimeUnit.NANOSECONDS.convert(1L, TimeUnit.SECONDS)/FPS) - (endTime - startTime);
        if(sleepTime > 0)
            try {
                Thread.sleep(TimeUnit.MILLISECONDS.convert(sleepTime, TimeUnit.NANOSECONDS));
            } catch (InterruptedException e) {
                break;
            }

    }
}

}

计算机和JVM选项：

Prism pipeline init order: d3d sw 
Using platform text rasterizer
Using native-based Pisces rasterizer
Using dirty region optimizations
Not using texture mask for primitives
Not forcing power of 2 sizes for textures
Using hardware CLAMP_TO_ZERO mode
Opting in for HiDPI pixel scaling
Prism pipeline name = com.sun.prism.d3d.D3DPipeline
Loading D3D native library ...
    succeeded.
Direct3D initialization succeeded
D3DPipelineManager: Created D3D9 device
(X) Got class = class com.sun.prism.d3d.D3DPipeline
Initialized prism pipeline: com.sun.prism.d3d.D3DPipeline
Maximum supported texture size: 8192
Maximum texture size clamped to 4096
OS Information:
    Windows 7 build 7601
D3D Driver Information:
    Intel(R) HD Graphics 4000 //tried on different machine with ATI Radeon 45XX - the same situation
    \\.\DISPLAY1
    Driver aticfx32.dll, version 8.17.10.1119
    Pixel Shader version 3.0
    Device : ven_8086, dev_0166, subsys_17F4103C
    Max Multisamples supported: 4
 vsync: true vpipe: true

JavaFX - 如何增加10K-15K多边形的Canvas绘图

0 个答案: