android绘制几何图形的实例代码

public class MyView extends View {   public MyView(Context context, AttributeSet set)   {     super(context, set);   }   @Override   // 重写该方法，进行绘图   protected void onDraw(Canvas canvas)   {     super.onDraw(canvas);     // 把整张画布绘制成白色     canvas.drawColor(Color.WHITE);     Paint paint = new Paint();//创建一个画笔对象     // 去锯齿     paint.setAntiAlias(true);     paint.setColor(Color.BLUE);//设置画笔颜色为蓝色     paint.setStyle(Paint.Style.STROKE);//设置样式     paint.setStrokeWidth(3);//设置样式的宽度     // 绘制圆形     canvas.drawCircle(40, 40, 30, paint);     // 绘制正方形     canvas.drawRect(10, 80, 70, 140, paint);     // 绘制矩形     canvas.drawRect(10, 150, 70, 190, paint);     RectF re1 = new RectF(10, 200, 70, 230);     // 绘制圆角矩形     canvas.drawRoundRect(re1, 15, 15, paint);     RectF re11 = new RectF(10, 240, 70, 270);     // 绘制椭圆     canvas.drawOval(re11, paint);         // 定义一个Path对象，封闭成一个三角形。     Path path1 = new Path();     path1.moveTo(10, 340);//将路径点设置到10，340位置     path1.lineTo(70, 340);//将起始路径点连接都70,340位置     path1.lineTo(40, 290);//将第二连接点连接到40,290位置     path1.close();//关闭路径的绘制     // 根据Path进行绘制，绘制三角形     canvas.drawPath(path1, paint);     // 定义一个Path对象，封闭成一个五角形。     Path path2 = new Path();     path2.moveTo(26, 360);     path2.lineTo(54, 360);     path2.lineTo(70, 392);     path2.lineTo(40, 420);     path2.lineTo(10, 392);     path2.close();     // 根据Path进行绘制，绘制五角形     canvas.drawPath(path2, paint);     // ----------设置填充风格后绘制----------     paint.setStyle(Paint.Style.FILL);     paint.setColor(Color.RED);     canvas.drawCircle(120, 40, 30, paint);     //绘制正方形     canvas.drawRect(90, 80, 150, 140, paint);     //绘制矩形     canvas.drawRect(90, 150, 150, 190, paint);     RectF re2 = new RectF(90, 200, 150, 230);     //绘制圆角矩形     canvas.drawRoundRect(re2, 15, 15, paint);     RectF re21 = new RectF(90, 240, 150, 270);     // 绘制椭圆     canvas.drawOval(re21, paint);         Path path3 = new Path();     path3.moveTo(90, 340);     path3.lineTo(150, 340);     path3.lineTo(120, 290);     path3.close();     //绘制三角形     canvas.drawPath(path3, paint);     Path path4 = new Path();     path4.moveTo(106, 360);     path4.lineTo(134, 360);     path4.lineTo(150, 392);     path4.lineTo(120, 420);     path4.lineTo(90, 392);     path4.close();     //绘制五角形     canvas.drawPath(path4, paint);     // ----------设置渐变器后绘制----------     // 为Paint设置渐变器     Shader mShader = new LinearGradient(0, 0, 40, 60       , new int[] {       Color.RED, Color.GREEN, Color.BLUE, Color.YELLOW }       , null , Shader.TileMode.REPEAT);     paint.setShader(mShader);     //设置阴影     paint.setShadowLayer(45 , 10 , 10 , Color.GRAY);     // 绘制圆形     canvas.drawCircle(200, 40, 30, paint);     // 绘制正方形     canvas.drawRect(170, 80, 230, 140, paint);     // 绘制矩形     canvas.drawRect(170, 150, 230, 190, paint);     RectF re3 = new RectF(170, 200, 230, 230);     // 绘制圆角矩形     canvas.drawRoundRect(re3, 15, 15, paint);     RectF re31 = new RectF(170, 240, 230, 270);     // 绘制椭圆     canvas.drawOval(re31, paint);         Path path5 = new Path();     path5.moveTo(170, 340);     path5.lineTo(230, 340);     path5.lineTo(200, 290);     path5.close();     // 根据Path进行绘制，绘制三角形     canvas.drawPath(path5, paint);     Path path6 = new Path();     path6.moveTo(186, 360);     path6.lineTo(214, 360);     path6.lineTo(230, 392);     path6.lineTo(200, 420);     path6.lineTo(170, 392);     path6.close();     // 根据Path进行绘制，绘制五角形     canvas.drawPath(path6, paint);     // ----------设置字符大小后绘制----------     paint.setTextSize(24);     paint.setShader(null);     // 绘制7个字符串     canvas.drawText(getResources().getString(R.string.circle), 240, 50,       paint);     canvas.drawText(getResources().getString(R.string.square), 240, 120,       paint);     canvas.drawText(getResources().getString(R.string.rect), 240, 175,       paint);     canvas.drawText(getResources().getString(R.string.round_rect), 230,       220, paint);     canvas.drawText(getResources().getString(R.string.oval), 240,       260, paint);         canvas.drawText(getResources().getString(R.string.triangle), 240, 325,       paint);     canvas.drawText(getResources().getString(R.string.pentagon), 240, 390,       paint);   } }