EffectDemo/app/src/main/java/com/xunao/effectdemo/view/MyView.java

package com.xunao.effectdemo.view;

/**
 * author : 程中强
 * e-mail : 740479946@qq.com
 * date : 2022/8/911:43
 * desc :
 * version: 1.0
 */

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);

	}

}