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)
作者:chenguang79 时间:2021-11-16 03:28:09
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:
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):
希望本文所述对大家Android程序设计有所帮助。
标签:Android,Canvas,绘制,图形
![](/images/zang.png)
![](/images/jiucuo.png)
猜你喜欢
springboot验证码生成以及验证功能举例详解
2023-11-19 03:14:23
![](https://img.aspxhome.com/file/2023/5/87195_0s.png)
C#使用round函数四舍五入的方法
2022-01-19 04:33:57
学习Java设计模式之观察者模式
2023-07-03 05:17:46
![](https://img.aspxhome.com/file/2023/1/66541_0s.jpg)
基于JavaMail API收发邮件的方法
2022-03-10 09:34:24
Spring Boot插件spring tool suite安装及使用详解
2021-12-15 03:29:23
![](https://img.aspxhome.com/file/2023/4/71844_0s.png)
C#实现DVD借出归还管理系统
2021-07-02 06:55:38
Android实现文字上下滚动效果
2023-02-02 07:40:00
Java利用过滤器实现完善登录功能
2021-07-20 15:07:05
![](https://img.aspxhome.com/file/2023/8/79868_0s.png)
Springboot整合Freemarker的实现详细过程
2023-01-23 22:09:57
![](https://img.aspxhome.com/file/2023/4/84164_0s.jpg)
c#连接excel示例分享
2023-08-10 07:42:04
Java实战在线选课系统的实现流程
2022-12-19 10:34:30
![](https://img.aspxhome.com/file/2023/4/86724_0s.png)
Java文本文件操作方法实例详解
2021-12-14 10:03:21
Java擦除和转换实例分析
2022-03-30 02:19:45
Spring Boot+Mybatis+Druid+PageHelper实现多数据源并分页的方法
2023-09-06 19:53:30
![](https://img.aspxhome.com/file/2023/9/65269_0s.png)
IDEA 2020.1 版自动导入MAVEN依赖的方法(新版MAVEN无法自动导入/更新POM依赖、MAVEN设置自动更新、自动更新快捷键)
2022-08-27 09:31:22
![](https://img.aspxhome.com/file/2023/4/88504_0s.png)
详细解读Java Spring AOP
2022-10-09 11:06:06
![](https://img.aspxhome.com/file/2023/5/83455_0s.jpg)
Spring之动态注册bean的实现方法
2023-09-26 14:01:17
![](https://img.aspxhome.com/file/2023/8/79888_0s.jpg)
详解java中BigDecimal精度问题
2021-08-17 10:24:59
![](https://img.aspxhome.com/file/2023/9/64039_0s.jpg)
基于java SSM springboot实现抗疫物质信息管理系统
2021-12-01 13:46:34
![](https://img.aspxhome.com/file/2023/2/72312_0s.png)
详解基于MVC的数据查询模块进行模糊查询
2022-02-13 19:26:49