Java|java教程
Android,Canvas,Path,绘制图形
Java-java教程在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。
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直接上代码：
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1.自定义的View组件代码：
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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 stubsuper.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 stubsuper.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)：
