在Java图形中绘制平滑曲线

我正在尝试绘制平滑的贝塞尔曲线以适合我绘制的一组数据，以便在Java图形绘制中绘制它。下面是我目前用来绘制的代码。这是绘制点很好，除了曲线有尖锐的边缘，有时有小骨折。有没有更好的方法可以使用java图形来制作平滑的拟合曲线？在Java图形中绘制平滑曲线

int numProfiles = speedList.size(); 
     int lenOfList; 
     System.out.println(); 
     System.out.println("Creating a new general path"); 

     //BasicStroke boldStroke = new BasicStroke(.3f); 
     //((Graphics2D)g).setStroke(boldStroke); 
     for (int i=0; i<numProfiles; i++){ 
      GeneralPath gp = new GeneralPath(); 
      g.setColor(colors[i]); 
      lenOfList = speedList.get(i).length; 
      if (lenOfList < 3) { 
       double xPlotVal1 = xMarginLeft + (((speedList.get(i)[0].getVal() - xMin)/(xMax - xMin)) * width); 
       double yPlotVal1 = yMarginTopAxisTop + (((depthList.get(i)[0].getVal() - yMin)/(yMax - yMin)) * height); 

       double xPlotVal2 = xMarginLeft + (((speedList.get(i)[1].getVal() - xMin)/(xMax - xMin)) * width); 
       double yPlotVal2 = yMarginTopAxisTop + (((depthList.get(i)[1].getVal() - yMin)/(yMax - yMin)) * height); 

       g.drawLine((int) xPlotVal1, (int) yPlotVal1, (int) xPlotVal2, (int) yPlotVal2); 

      } else { 
       System.out.println("More than 2 pts"); 
       for (int j = 0; j < (lenOfList - 2); j++) { 

        double xPlotVal1 = xMarginLeft + (((speedList.get(i)[j].getVal() - xMin)/(xMax - xMin)) * width); 
        double yPlotVal1 = yMarginTopAxisTop + (((depthList.get(i)[j].getVal() - yMin)/(yMax - yMin)) * height); 

        double xPlotVal2 = xMarginLeft + (((speedList.get(i)[j + 1].getVal() - xMin)/(xMax - xMin)) * width); 
        double yPlotVal2 = yMarginTopAxisTop + (((depthList.get(i)[j + 1].getVal() - yMin)/(yMax - yMin)) * height); 

        double xPlotVal3 = xMarginLeft + (((speedList.get(i)[j + 2].getVal() - xMin)/(xMax - xMin)) * width); 
        double yPlotVal3 = yMarginTopAxisTop + (((depthList.get(i)[j + 2].getVal() - yMin)/(yMax - yMin)) * height); 
        gp.moveTo(xPlotVal1, yPlotVal1); 

        if (j==0) gp.moveTo(xPlotVal1, yPlotVal1); 
        // gp.moveTo(xPlotVal1, yPlotVal1); 
        gp.curveTo(xPlotVal1, yPlotVal1, xPlotVal2, yPlotVal2, 
          xPlotVal3, yPlotVal3); 

       } 
       ((Graphics2D) g).draw(gp); 
      } 
     }

这里是什么它画图：
enter image description here

在7:34 // 2012年6月26日，//这里是我后添加呈现提示更新的代码

// the profiles 
    Graphics2D g2d = (Graphics2D)g; 
    int numProfiles = speedList.size(); 
    int lenOfList; 
    for (int i=0; i<numProfiles; i++){ 
     GeneralPath gp = new GeneralPath(); 
     g2d.setColor(colors[i]); 

     lenOfList = speedList.get(i).length; 
     if (lenOfList < 3) { 
      double xPlotVal1 = xMarginLeft + (((speedList.get(i)[0].getVal() - xMin)/(xMax - xMin)) * width); 
      double yPlotVal1 = yMarginTopAxisTop + (((depthList.get(i)[0].getVal() - yMin)/(yMax - yMin)) * height); 

      double xPlotVal2 = xMarginLeft + (((speedList.get(i)[1].getVal() - xMin)/(xMax - xMin)) * width); 
      double yPlotVal2 = yMarginTopAxisTop + (((depthList.get(i)[1].getVal() - yMin)/(yMax - yMin)) * height); 

      g2d.drawLine((int) xPlotVal1, (int) yPlotVal1, (int) xPlotVal2, (int) yPlotVal2); 

     } else { 
      for (int j = 0; j < (lenOfList - 2); j++) { 

       double xPlotVal1 = xMarginLeft + (((speedList.get(i)[j].getVal() - xMin)/(xMax - xMin)) * width); 
       double yPlotVal1 = yMarginTopAxisTop + (((depthList.get(i)[j].getVal() - yMin)/(yMax - yMin)) * height); 

       double xPlotVal2 = xMarginLeft + (((speedList.get(i)[j + 1].getVal() - xMin)/(xMax - xMin)) * width); 
       double yPlotVal2 = yMarginTopAxisTop + (((depthList.get(i)[j + 1].getVal() - yMin)/(yMax - yMin)) * height); 

       double xPlotVal3 = xMarginLeft + (((speedList.get(i)[j + 2].getVal() - xMin)/(xMax - xMin)) * width); 
       double yPlotVal3 = yMarginTopAxisTop + (((depthList.get(i)[j + 2].getVal() - yMin)/(yMax - yMin)) * height); 
       gp.moveTo(xPlotVal1, yPlotVal1); 

       if (j==0) gp.moveTo(xPlotVal1, yPlotVal1);  //only move at the begining of the curve drawing 
       // gp.moveTo(xPlotVal1, yPlotVal1); 
       gp.curveTo(xPlotVal1, yPlotVal1, xPlotVal2, yPlotVal2, 
         xPlotVal3, yPlotVal3); 

      } 
      g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON); 
      g2d.draw(gp); 
     } 
    }

这是最新的图片。我不知道为什么它使我的背景网格线消失。绘制彩色轮廓后，绘制网格线。 enter image description here

来源

2012-06-25 Erica Dohring

我该怎么做？我对Stack Overflow很新，所以我不太清楚它是如何工作的。 –

您需要启用antaliasing的Graphics2D对象。

做这样的

Graphics graphics = ... 
Graphics2D g2d = (Graphics2D) graphics; 

g2d.setRenderingHint(
    RenderingHints.KEY_ANTIALIASING, 
    RenderingHints.VALUE_ANTIALIAS_ON); 

// You can also enable antialiasing for text: 

g2d.setRenderingHint(
    RenderingHints.KEY_TEXT_ANTIALIASING, 
    RenderingHints.VALUE_TEXT_ANTIALIAS_ON);

使用graphics对象绘制任何东西之前执行此操作。

另请参阅RenderingHints javadoc。

来源

2012-06-25 16:25:56 npe

嗯。我尝试了渲染提示代码，它仍然绘制相同的图片。 –

发布更新后的代码，或许您的提示太迟，或错误的对象。并发布您的Java版本。 – npe

好的，只需在第一次尝试下面的代码下发布更新后的版本。 –

使用Graphics2D与antialising：

Graphics2D g2 = (Graphics2D)g; 
g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, 
    RenderingHints.VALUE_ANTIALIAS_ON); 
//... 
g2.draw(gp);

来源

2012-06-25 16:23:45 elias

在Java图形中绘制平滑曲线

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