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Android编程开发之在Canvas中利用Path绘制基本图形(圆形,矩形,椭圆,三角形等)

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这篇CFSDN的博客文章Android编程开发之在Canvas中利用Path绘制基本图形(圆形,矩形,椭圆,三角形等)由作者收集整理,如果你对这篇文章有兴趣,记得点赞哟.

本文实例讲述了Android编程开发之在Canvas中利用Path绘制基本图形的方法。分享给大家供大家参考,具体如下:

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:

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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 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:

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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):

  。

希望本文所述对大家Android程序设计有所帮助.

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