Android编程绘图操作之弧形绘制方法示例

本文实例讲述了android编程绘图操作之弧形绘制方法。分享给大家供大家参考，具体如下：

/**
 * 绘制弧形图案
 * @description：
 * @author ldm
 * @date 2016-4-25 下午4:37:01
 */
public class arcsactivity extends activity {
  @override
  protected void oncreate(bundle savedinstancestate) {
    super.oncreate(savedinstancestate);
    setcontentview(new sampleview(this));
  }
  /**
   * 自定义绘制图案的view
   *
   * @description：
   * @author ldm
   * @date 2016-4-25 下午4:19:40
   */
  private static class sampleview extends view {
    // 画圆形图案的画笔数组
    private paint[] mpaints;
    // 画矩形的画笔
    private paint mframepaint;
    // 是否以矩形中心画图
    private boolean[] musecenters;
    // 矩形框数组
    private rectf[] movals;
    // 上面较大的矩形框
    private rectf mbigoval;
    // 画圆弧起点
    private float mstart;
    // 画圆弧角度
    private float msweep;
    // 画大图形对应角标index
    private int mbigindex;
    // 角度变化增量
    private static final float angle_step = 3;
    // 初始角度
    private static final float start_angle = 15;
    public sampleview(context context) {
      super(context);
      mpaints = new paint[4];
      musecenters = new boolean[4];
      movals = new rectf[4];
      mpaints[0] = new paint();
      mpaints[0].setantialias(true);// 设置抗紧钜齿
      mpaints[0].setstyle(paint.style.fill);// 设置画笔填充风格
      mpaints[0].setcolor(0x88ff0000);// 设置颜色
      musecenters[0] = false;
      mpaints[1] = new paint(mpaints[0]);
      mpaints[1].setcolor(0x8800ff00);
      musecenters[1] = true;
      mpaints[2] = new paint(mpaints[0]);
      mpaints[2].setstyle(paint.style.stroke);// 设置画笔空心风格
      mpaints[2].setstrokewidth(4);// 设置画笔宽度
      mpaints[2].setcolor(0x880000ff);// 设置颜色
      musecenters[2] = false;
      mpaints[3] = new paint(mpaints[2]);
      mpaints[3].setcolor(0x88888888);
      musecenters[3] = true;
      mbigoval = new rectf(40, 10, 280, 250);// 初始化较大的矩形
      movals[0] = new rectf(10, 270, 70, 330);// 初始化4个较小矩形
      movals[1] = new rectf(90, 270, 150, 330);
      movals[2] = new rectf(170, 270, 230, 330);
      movals[3] = new rectf(250, 270, 310, 330);
      mframepaint = new paint();
      mframepaint.setantialias(true);
      mframepaint.setstyle(paint.style.stroke);
      mframepaint.setstrokewidth(0);
    }
    @override
    protected void ondraw(canvas canvas) {
      canvas.drawcolor(color.white);
      // 画大矩形
      canvas.drawrect(mbigoval, mframepaint);
      // 在大矩形分别 画4个圆弧图形
      canvas.drawarc(mbigoval, mstart, msweep, musecenters[mbigindex],
          mpaints[mbigindex]);
      for (int i = 0; i < 4; i++) {
        canvas.drawrect(movals[i], mframepaint);// 画四个小矩形
        canvas.drawarc(movals[i], mstart, msweep, musecenters[i],// 在四个小矩形中分别画圆弧
            mpaints[i]);
      }
      msweep += angle_step;// 弧度改变
      if (msweep > 360) {// 弧度控制
        msweep -= 360;
        mstart += start_angle;
        if (mstart >= 360) {
          mstart -= 360;
        }
        mbigindex = (mbigindex + 1) % movals.length;
      }
      invalidate();
    }
  }
}

静态效果如图：

更多关于android相关内容感兴趣的读者可查看本站专题：《android图形与图像处理技巧总结》、《android开发入门与进阶教程》、《android调试技巧与常见问题解决方法汇总》、《android基本组件用法总结》、《android视图view技巧总结》、《android布局layout技巧总结》及《android控件用法总结》

希望本文所述对大家android程序设计有所帮助。