怎么在android中绘制一个几何图形
本篇文章为大家展示了怎么在android中绘制一个几何图形，内容简明扼要并且容易理解，绝对能使你眼前一亮，通过这篇文章的详细介绍希望你能有所收获。
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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 path2 = new Path();
path2.moveTo(10, 340);//将路径点设置到10，340位置
path2.lineTo(70, 340);//将起始路径点连接都70,340位置
path2.lineTo(40, 290);//将第二连接点连接到40,290位置
path2.close();//关闭路径的绘制
// 根据Path进行绘制，绘制三角形
canvas.drawPath(path2, paint);
// 定义一个Path对象，封闭成一个五角形。
Path path3 = new Path();
path3.moveTo(26, 360);
path3.lineTo(54, 360);
path3.lineTo(70, 392);
path3.lineTo(40, 420);
path3.lineTo(10, 392);
path3.close();
// 根据Path进行绘制，绘制五角形
canvas.drawPath(path3, 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 path4 = new Path();
path4.moveTo(90, 340);
path4.lineTo(150, 340);
path4.lineTo(120, 290);
path4.close();
//绘制三角形
canvas.drawPath(path4, paint);
Path path5 = new Path();
path5.moveTo(106, 360);
path5.lineTo(134, 360);
path5.lineTo(150, 392);
path5.lineTo(120, 420);
path5.lineTo(90, 392);
path5.close();
//绘制五角形
canvas.drawPath(path5, 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 path6 = new Path();
path6.moveTo(170, 340);
path6.lineTo(230, 340);
path6.lineTo(200, 290);
path6.close();
// 根据Path进行绘制，绘制三角形
canvas.drawPath(path6, paint);
Path path7 = new Path();
path7.moveTo(186, 360);
path7.lineTo(214, 360);
path7.lineTo(230, 392);
path7.lineTo(200, 420);
path7.lineTo(170, 392);
path7.close();
// 根据Path进行绘制，绘制五角形
canvas.drawPath(path7, 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);
}
}上述内容就是怎么在android中绘制一个几何图形，你们学到知识或技能了吗？如果还想学到更多技能或者丰富自己的知识储备，欢迎关注创新互联行业资讯频道。
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