Android Canvas绘制丘比特之箭

来源：互联网发布：js 视频加载完成后执行编辑：程序博客网时间：2024/05/17 04:45

画心形

学习Android图形绘制过程中，随随便便的作品。
随便看看就好~~~

package com.zdl.gift.custom;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.RectF;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;/** * Created by zdl on 2017/8/30. */public class Heart extends View {    private Paint heartPaint;    private RectF rectFTopLeft;    private RectF rectFTopRight;    private RectF rectFBottom;    private int width;    private int height;    private Paint whitePaint1;    private Paint whitePaint2;    private RectF rectFLeft;    private RectF rectFRight;    public Heart(Context context) {        super(context);    }    public Heart(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init();    }    public Heart(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        width = 3*getMeasuredWidth()/4;//取宽的3/4来绘制，让旋转图形过后，心形能够完全展示        height = 3*getMeasuredHeight()/4;//取高的3/4来绘制，让旋转图形过后，心形能够完全展示    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(Color.TRANSPARENT);//设置背景透明        canvas.rotate(45, getMeasuredWidth()/2, getMeasuredHeight()/2);//旋转45°，使心形变正        rectFTopLeft.set(2, height/3+2, 2*width/3-2, height-2);//心形的左上部绘制位置        rectFTopRight.set(width/3+2, 2, width-2, 2*height/3-2);//心形的右上部绘制位置        rectFBottom.set(width/3, height/3, width-4, height-4);//心形的下部绘制位置        rectFLeft.set(width/3, height-4, width, height);//心形左边描边位置        rectFRight.set(width-4, height/3, width, height);//心形右边描边位置        canvas.drawRect(rectFBottom, heartPaint);//心下部        canvas.drawRect(rectFLeft, whitePaint2);//心下部左边描边        canvas.drawRect(rectFRight, whitePaint2);//心下部右边描边        /*        先画心的下部正方形，再画心的左上角、右上角，是为了覆盖正方形的左上角的点        这里给心左上角、右上角描边，修改起始角度和经过角度，是为了将上面正方形的左上角红色覆盖         */        canvas.drawArc(rectFTopLeft, 90, 180, true, heartPaint);//心左上角        canvas.drawArc(rectFTopLeft, 90, 185, false, whitePaint1);//心左上角描边        canvas.drawArc(rectFTopRight, 180, 180, true, heartPaint);//心右上角        canvas.drawArc(rectFTopRight, 175, 186, false, whitePaint1);//心右上角描边    }    private void init() {        heartPaint = new Paint();//画心的红色画笔        heartPaint.setAntiAlias(true);//抗锯齿        heartPaint.setColor(Color.RED);        whitePaint1 = new Paint();//给心形描边的白色画笔        whitePaint1.setAntiAlias(true);        whitePaint1.setColor(Color.WHITE);        whitePaint1.setStrokeWidth(4.0f);//画笔的宽度        whitePaint1.setStyle(Paint.Style.STROKE);//FILL:实心     STROKE:空心        whitePaint2 = new Paint();//给心形描边的白色画笔        whitePaint2.setAntiAlias(true);        whitePaint2.setColor(Color.WHITE);        rectFTopLeft = new RectF();//心左上角位置        rectFTopRight = new RectF();//心右上角位置        rectFBottom = new RectF();//心下部位置        rectFLeft = new RectF();//心下部左边描边位置        rectFRight = new RectF();//心下部右边描边位置    }}

来张效果图：

就是简简单单的一个心（#手动滑稽）

这里要说一下，为什么心周围要描白边呢，你猜~~

当然是做这个啦

一箭穿心（#斜眼），当然，这里还差箭

接下来就是箭了：

画箭头

package com.zdl.gift.custom;import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.support.annotation.Nullable;import android.util.AttributeSet;import android.view.View;/** * Created by zdl on 2017/8/30. */public class Arrow extends View {    private int width;    private int height;    private Paint arrowPaint;    private Path arrowPath;    public Arrow(Context context) {        super(context);    }    public Arrow(Context context, @Nullable AttributeSet attrs) {        super(context, attrs);        init();    }    public Arrow(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        init();    }    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        super.onMeasure(widthMeasureSpec, heightMeasureSpec);        width = getMeasuredWidth();        height = getMeasuredHeight();    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        canvas.drawColor(Color.TRANSPARENT);        canvas.rotate(165, width/2, height/2);        //箭头主体        arrowPath.moveTo(20, height/2-3);        arrowPath.lineTo(width-30, height/2-3);        arrowPath.lineTo(width-30, height/2-12);        arrowPath.lineTo(width, height/2);        arrowPath.lineTo(width-30, height/2+12);        arrowPath.lineTo(width-30, height/2+3);        arrowPath.lineTo(20, height/2+3);        arrowPath.close();        canvas.drawPath(arrowPath, arrowPaint);        //上部尾翼        for (int i = 0; i < 3; i++) {            arrowPath.moveTo(20+20*i, height/2-3);            arrowPath.lineTo(0+20*i, height/2-23);            arrowPath.lineTo(12+20*i, height/2-23);            arrowPath.lineTo(32+20*i, height/2-3);            arrowPath.close();            canvas.drawPath(arrowPath, arrowPaint);        }        //下部尾翼        for (int i = 0; i < 3; i++) {            arrowPath.moveTo(20+20*i, height/2+3);            arrowPath.lineTo(0+20*i, height/2+23);            arrowPath.lineTo(12+20*i, height/2+23);            arrowPath.lineTo(32+20*i, height/2+3);            arrowPath.close();            canvas.drawPath(arrowPath, arrowPaint);        }    }    private void init() {        arrowPaint = new Paint();//箭头的画笔        arrowPaint.setAntiAlias(true);//抗锯齿        arrowPaint.setColor(Color.parseColor("#33ffff"));        arrowPaint.setStyle(Paint.Style.FILL);//FILL:实心     STROKE:空心        arrowPath = new Path();    }}

箭Get：

一只穿云箭~~~

丘比特之箭，咻~~~

组合后：

丘比特之箭~~~

然并卵，里面有个问题（没发现的请忽视），现在并没有解决，啥时候想起来了，再议~
为什么这么做呢？当然是逼死强迫症啦~~
其实，主要是还没想好怎么解决（#斜眼）

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