android绘制几何图形

效果图：
android绘制几何图形_第1张图片
代码（仅绘制类，不可直接运行）：
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);}}
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