Android UI效果之绘图篇（二）

/**
  * 绘制弧形
  * @param oval 绘制区域
  * @param startAngle 开始绘制的角度
  * @param sweepAngle 结束绘制的角度
  * @param useCenter 是否使用中心
  * @param paint 画笔
  */
 public void drawArc(RectF oval, float startAngle, float sweepAngle,boolean useCenter, Paint paint)

mPaint.setStyle(Paint.Style.STROKE);
  mPaint.setStrokeWidth(3);
  Path path = new Path();
  path.moveTo(5, 10);
  path.lineTo(120, 30);
  path.lineTo(44, 66);
  path.lineTo(77, 231);
  canvas.drawPath(path, mPaint);

 mPaint.setStyle(Paint.Style.STROKE);
  mPaint.setStrokeWidth(3);
  Path path = new Path();
  path.moveTo(50, 50);
  path.lineTo(200, 250);
  path.lineTo(300, 450);
  path.lineTo(300, 650);
  mPaint.setTextSize(46);
  canvas.drawTextOnPath("Hi_xiaoyu_bolg_in_android", path, 0, 0, mPaint);

/**
  * 画圆
  * @param cx  圆心X坐标
  * @param cy  圆心Y坐标
  * @param radius 圆的半径
  * @param paint 
  */
 public void drawCircle(float cx, float cy, float radius, Paint paint) {
 } 

  // 画圆
  canvas.drawCircle(50, 50, 50, mPaint);
  RectF r = new RectF(150, 0, 270, 110);
  // 画矩形
  canvas.drawRect(r, mPaint);
  RectF oval = new RectF(0, 120, 50, 270);
  // 画椭圆
  canvas.drawOval(oval, mPaint);
  RectF rect = new RectF(100, 120, 170, 200);
  // 画圆角矩形
  canvas.drawRoundRect(rect, 30, 20, mPaint);
  // 画线
  canvas.drawLine(200, 120, 300, 300, mPaint);

canvas.save();
canvas.restore();
canvas.translate(dx, dy);
canvas.rotate(degrees);
canvas.saveLayer(bounds, paint, saveFlags);

paint.setColor(0xff00ccff);
  paint.setAntiAlias(true);
  paint.setStyle(Style.STROKE);
  canvas.translate(canvas.getWidth() / 2, 200); // 将位置移动画纸的坐标点,不用每次都从坐标原点计算
  canvas.drawCircle(0, 0, 100, paint); 
  Paint tmpPaint = new Paint(paint); 
  tmpPaint.setStrokeWidth(1);
  float y = 100;
  int count = 60; // 总刻度数
  for (int i = 0; i < count; i++) {
   if (i % 5 == 0) {
    canvas.drawLine(0f, y, 0, y + 12f, paint);
    canvas.drawText(String.valueOf(i / 5 + 1), -4f, y + 25f,
      tmpPaint);
   } else {
    canvas.drawLine(0f, y, 0f, y + 5f, tmpPaint);
   }
   canvas.rotate(360 / count, 0f, 0f); // 旋转画纸
  }
  // 绘制指针
  paint.setStrokeWidth(2);
  canvas.drawLine(0, 10, 0, -65, paint);
  paint.setStrokeWidth(4);
  canvas.drawLine(0, 10, 20, -35, paint);