在Canvas中利用Path绘制基本图形

来源：互联网发布：苹果mac下载哪些软件编辑：程序博客网时间：2024/06/05 00:30

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。

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);      }      // 绘图    @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(多了一个椭圆哭)
这里写图片描述

0 0