Android软件开发：在Canvas中利用Path绘制基本图形

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在Android中绘制基本的集合图形，本程序就是自定义一个View组件，程序重写该View组件的onDraw(Canvase)方法，然后在该Canvas上绘制大量的基本的集合图形。

直接上代码：
1.自定义的View组件代码：
    package com.infy.configuration;            import android.content.Context;      import android.graphics.Canvas;      import android.graphics.Color;      import android.graphics.LinearGradient;      import android.graphics.Paint;      import android.graphics.Path;      import android.graphics.RectF;      import android.graphics.Shader;      import android.util.AttributeSet;      import android.view.View;            public class MyView extends View{                public MyView(Context context, AttributeSet attrs) {              super(context, attrs);          }                @Override          protected void onDraw(Canvas canvas) {              // TODO Auto-generated method stub               super.onDraw(canvas);                            //把整张画布绘制成白色               canvas.drawColor(Color.WHITE);              Paint paint = new Paint();                            //去锯齿               paint.setAntiAlias(true);              paint.setColor(Color.BLUE);              paint.setStyle(Paint.Style.STROKE);              paint.setStrokeWidth(3);                            //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 rel = new RectF(10,240,70,270);              //绘制椭圆               canvas.drawOval(rel, paint);              //定义一个Path对象，封闭一个三角形               Path path1 = new Path();              path1.moveTo(10, 340);              path1.lineTo(70, 340);              path1.lineTo(40, 290);              path1.close();              //根据Path进行绘制，绘制三角形               canvas.drawPath(path1, paint);                            //定义一个Path对象，封闭一个五角星               Path path2 = new Path();              path2.moveTo(27, 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，绘制五角星               canvas.drawPath(path2, paint);                            //设置填丛风格后进行绘制               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);                            //绘制圆角矩形               RectF re2 = new RectF(90,200,150,230);              canvas.drawRoundRect(re2, 15, 15, paint);              //绘制椭圆               RectF re21 = new RectF(90, 240, 150, 270);              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);                            //绘制五角形               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();              canvas.drawPath(path4, paint);                            //设置渐变器后绘制               //为Paint设置渐变器               Shader mShasder = new LinearGradient(0, 0, 40, 60, new int[]{Color.RED,Color.GREEN,Color.BLUE,Color.YELLOW}, null, Shader.TileMode.REPEAT);              paint.setShader(mShasder);              //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);                            //绘制圆角的矩形               RectF re31 = new RectF();              canvas.drawRoundRect(re31, 15, 15, paint);                            //绘制椭圆               RectF re32 =new RectF();              canvas.drawOval(re32, paint);                            //根据Path,绘制三角形               Path path5 = new Path();              path5.moveTo(170, 340);              path5.lineTo(230, 340);              path5.lineTo(200, 290);              path5.close();              canvas.drawPath(path5, paint);                            //根据PAth,进行绘制五角形               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();              canvas.drawPath(path6, paint);                       }            }  2. 使用一个基本的Activity来实现自定义的MyView组件，定义一个ZiDingYiViewTes的Activity：    package com.infy.configuration;            import android.app.Activity;      import android.os.Bundle;            public class ZiDingYiViewTes extends Activity{                    private MyView myView =null;                @Override          protected void onCreate(Bundle savedInstanceState) {              // TODO Auto-generated method stub               super.onCreate(savedInstanceState);                            myView = new MyView(this, null);                            setContentView(myView);                        }      }
Android的Canvas既可以绘制简单的集合图形，也可以直接将一个Bitmap绘制到画布上。
最后附上效果图(多了一个椭圆)：
转自：http://www.linuxidc.com/Linux/2012-05/61204.htm
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