vbarchart3dbean.java

提供 精通Java Web动态图表编程 一书的源代码, 大家赶快下载呀

    int stringLength = 0, stringHeight = 0;

    // 横轴上刻度值的数量
    int xTickCounter = category.length;

    // 图表绘制区和纵轴之间的空白
    int plotMargin = plotWidth / (2 * xTickCounter);

    // 横轴上刻度值之间的长度
    int hSpace;
    if (xTickCounter == 1)
    {
      hSpace = plotWidth;
    }
    else
    {
      hSpace = (plotWidth - 2 * plotMargin) / (xTickCounter - 1);
    }


    // 每组直方图之间的空白
    int barOuterMargin = 20;

    // 每组直方图中，每个直方块之间的空白
    int barInnerMargin = 5;

    // 设定直方块的绘制宽度
    int barLength =
      (hSpace - barOuterMargin - series.length * barInnerMargin) / series.length;

    stringHeight = g2d.getFontMetrics().getAscent();
    for (int i = 0; i < xTickCounter; i++)
    {
      // 设置横轴上刻度绘制的横坐标
      int xTickPosition = plotMargin + i * hSpace;

      // 绘制垂直方向虚线
      g2d.setColor(new Color(103, 115, 133));

      // 绘制垂直方向虚线
      drawVerticalLine(xTickPosition, basePointY, thickness,
        alpha, plotHeight, g2d);

      // 绘制横轴上的斜线
      drawSlantLine(xTickPosition, basePointY, thickness, alpha, g2d);

      // 绘制横轴上刻度值的说明文字
      stringLength = g2d.getFontMetrics().stringWidth(category[i]);
      g2d.setColor(new Color(246, 213, 164));


      g2d.drawString(category[i], xTickPosition - stringLength / 2,
        plotHeight + stringHeight + 5);
    }

    String str = "";
    str = "";

    // 纵轴上刻度值的数量
    int vTickCounter = 10;

    // 纵轴上刻度值之间的空白
    int vSpace = plotHeight / vTickCounter;

    for (int i = 0; i < vTickCounter; i++)
    {
      // 绘制水平方向虚线
      g2d.setColor(new Color(103, 115, 133));
      // g2d.drawLine(0, i * vSpace, plotWidth, i * vSpace);

      // 绘制水平方向虚线
      drawHorizontalLine(topLeftPointX, i * vSpace, thickness,
        alpha, plotWidth, g2d);

      // 绘制纵轴上的斜线
      drawSlantLine(topLeftPointX, i * vSpace, thickness, alpha, g2d);

      // 绘制纵轴上刻度值的说明文字
      str += plotHeight - i * vSpace;
      stringLength = g2d.getFontMetrics().stringWidth(str);
      g2d.setColor(new Color(246, 213, 164));
      g2d.drawString(str,  - 5-stringLength, i * vSpace + stringHeight / 2);
      str = "";
    }

    double[]sales = new double[series.length];
    double totalBarLength = series.length * (barLength + barInnerMargin);

    g2d.setFont(new Font("Courier New", Font.PLAIN, 12));
    g2d.setStroke(new BasicStroke());

    // 打开反锯齿功能，用于平滑处理3D矩形
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
      RenderingHints.VALUE_ANTIALIAS_ON);

    // 创建AlphaComposite对象，并设定透明度
    AlphaComposite ac = AlphaComposite.getInstance(AlphaComposite.SRC_OVER,
      alphaComposite);
    g2d.setComposite(ac);

    for (int i = 0; i < xTickCounter; i++)
    {
      // 初始化绘制数据
      int bookSales = 0;

      for (int j = 0; j < series.length; j++)
      {

        sales[j] = plotHeight - (65+(int)(Math.random() * 220));

        // 计算直方块的绘制横坐标
        double xVBarPosition = plotMargin + i * hSpace - totalBarLength / 2 +
          j * (barLength + barInnerMargin);

        g2d.setColor(paintColor[j % paintColor.length]);

        // 初始化3D矩形的绘制参数
        parallelogram.setBasePoint((int)xVBarPosition, basePointY);
        parallelogram.setWidth(barLength);
        parallelogram.setHeight((int)(plotHeight - sales[j]));
        parallelogram.setThickness(thickness);
        parallelogram.setAngle(alpha);

        // 填充3D矩形
        parallelogram.setFillColor(paintColor[j % paintColor.length]);
        parallelogram.drawParallelogram(2, g2d);

        // 描绘3D矩形轮廓
        parallelogram.setOutlineColor(Color.BLACK);
        parallelogram.drawParallelogram(1, g2d);

      }
    }

    // 调用AlphaComposite的静态变量Src, 重新定义AlphaCompoiste对象
    ac = AlphaComposite.Src;
    g2d.setComposite(ac);

    // 重新关闭反锯齿功能
    g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
      RenderingHints.VALUE_ANTIALIAS_OFF);

    // 恢复以前的AffineTransform对象
    g2d.setTransform(old);

    // 绘制坐标轴图例
    drawLegend(series);
  }

  // 绘制图例
  public void drawLegend(String[]legendItems)
  {
    g2d.setStroke(new BasicStroke());
    g2d.setFont(new Font("宋体", Font.PLAIN, 12));
    g2d.setPaint(Color.WHITE);

    int itemHeight = g2d.getFontMetrics().getAscent();
    int itemWidth[] = new int[legendItems.length];

    // 图例的长度
    int legendWidth = 20;

    for (int i = 0; i < legendItems.length; i++)
    {
      itemWidth[i] = g2d.getFontMetrics().stringWidth(legendItems[i]);

      if (i != legendItems.length - 1)
      {
        legendWidth += itemWidth[i] + 20;
      }
      else
      {
        legendWidth += itemWidth[i] + 15;
      }
    }

    g2d.fillRect((width - legendWidth) / 2, height - 25, legendWidth, itemHeight + 5);
    g2d.setColor(Color.BLACK);
    g2d.drawRect((width - legendWidth) / 2, height - 25, legendWidth, itemHeight + 5);
    int itemAnchor = (width - legendWidth) / 2+10;
    g2d.setColor(Color.BLACK);
    for (int i = 0; i < legendItems.length; i++)
    {
      g2d.setColor(paintColor[i % paintColor.length]);
      g2d.fillRect(itemAnchor, height - 20, 10, 10);
      g2d.setColor(Color.BLACK);
      g2d.drawString(legendItems[i], itemAnchor + 15, height - 12);
      itemAnchor += itemWidth[i] + 20;
    }
  }

  // 绘制坐标轴标题
  public void drawAxisLabel()
  {
    g2d.setFont(new Font("楷体_GB2312", Font.BOLD, 18));
    g2d.setPaint(new Color(242, 159, 25));
    int labelHeight = g2d.getFontMetrics().getAscent();

    int labelLength = g2d.getFontMetrics().stringWidth(rangeAxisLabel);

    // 获得当前的AffineTransform对象
    AffineTransform old = g2d.getTransform();

    g2d.translate(40, (height + labelLength) / 2);
    g2d.rotate( - Math.PI / 2);
    g2d.drawString(rangeAxisLabel, 0, 0);

    // 恢复以前的AffineTransform对象
    g2d.setTransform(old);

    labelLength = g2d.getFontMetrics().stringWidth(domainAxisLabel);
    g2d.drawString(domainAxisLabel, (width - labelLength) / 2, 370);
  }


  public void getChart()
  {
    this.initialize();
    this.drawBackground();
    this.drawTitle();
    this.drawChart();
    this.drawAxisLabel();

    // 部署图形环境
    g2d.dispose();

    // 输出图像到WEB页面
    try
    {
      this.response.reset();
      this.response.setContentType("image/png");
      OutputStream sos = response.getOutputStream();
      ImageIO.write(image, "PNG", sos);

      sos.close();
    }
    catch (Exception e)
    {
      System.out.println("图表输出错误!");
    }
  }

}

/**************************************************************************
 * (C) Copyright 2004-2005 by Jingkui Zhong(钟京馗) and Huan Tang(唐桓).  *
 * All Rights Reserved.                                                   *
 *                                                                        *
 * DISCLAIMER: The authors of this code have used their                   *
 * best efforts in preparing the code. These efforts include the          *
 * development, research, and testing of the theories and programs        *
 * to determine their effectiveness. The authors and publisher make       *
 * no warranty of any kind, expressed or implied, with regard to these    *
 * programs or to the documentation contained in these codes. The authors *
 * shall not be liable in any event for incidental or consequential       *
 * damages in connection with, or arising out of, the furnishing,         *
 * performance, or use of these programs.                                 *
 **************************************************************************/