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我已经计算了需要绘制的点的值，并将它们放入 Point3f 数组中。我有 526 435 分。下一步是一个接一个地绘制点，使其看起来像一条连续的线，或者使用 LineStripArray 在点之间绘制线。因为我没有找到如何逐点绘制，所以我尝试使用 LineStripArray。

我从这里获取了代码，并使用以下代码更改了方法“createLineTypes”的内容：

    Group lineGroup = new Group();

    Appearance app = new Appearance();
    ColoringAttributes ca = new ColoringAttributes(black, ColoringAttributes.SHADE_FLAT);
    app.setColoringAttributes(ca);

    Computing comp = new Computing();

    //the following row computes the values of the points I want to draw 
    //and it works alright; the points are saved into 
    //**static List<Vector3> computed_values** from  class Computing,
    // where Vector3 class defines a 3D point actually
    comp.do_the_job();    

    Point3f[] dashPts = new Point3f[Computing.computed_values.size()];
    for(int i = 0; i < Computing.computed_values.size(); i++)
    {
        dashPts[i] = new Point3f((int)Computing.computed_values.get(i).getX(), (int)Computing.computed_values.get(i).getY(), (int)Computing.computed_values.get(i).getZ());

    }
    System.out.print(Computing.computed_values.size());
    int[] a = {Computing.computed_values.size()};
    LineStripArray dash = new LineStripArray(Computing.computed_values.size(), LineArray.COORDINATES, a);
    dash.setCoordinates(0, dashPts);
    LineAttributes dashLa = new LineAttributes();
    dashLa.setLineWidth(1.0f);
    dashLa.setLinePattern(LineAttributes.PATTERN_SOLID);
    Shape3D dashShape = new Shape3D(dash, app);
    lineGroup.addChild(dashShape);


    return lineGroup;

问题是它只画了1条垂直线。有任何想法吗？

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1 回答 1

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我找到了一个解决方案，它与 PointArray 一起使用。这里是

    Group lineGroup = new Group();

    Appearance app = new Appearance();
    ColoringAttributes ca = new ColoringAttributes(black, ColoringAttributes.SHADE_FLAT);
    app.setColoringAttributes(ca);

    Computing comp = new Computing();
    comp.do_the_job();

    Point3f[] plaPts = new Point3f[Computing.computed_values.size()];
    for(int i = 0; i < Computing.computed_values.size(); i++)
    {           
        plaPts[i] = new Point3f((float)Computing.computed_values.get(i).getX(), (float)Computing.computed_values.get(i).getY(), (float)Computing.computed_values.get(i).getZ());            
    }

    PointArray pla = new PointArray(Computing.computed_values.size(), GeometryArray.COORDINATES);
    pla.setCoordinates(0, plaPts);
    Shape3D plShape = new Shape3D(pla, app);
    lineGroup.addChild(plShape);

    return lineGroup;

重要提示：对于我的应用程序，我必须将值转换为 float，而不是像最初那样转换为 int。

于 2012-05-15T16:35:45.360 回答