Android使用贝塞尔曲线画心形

一开始我只是想画个圆，可画着画着就成了心形，那就将错就错

1. 创建一个Activity

RelativeLayout container = findViewById(R.id.download_container);    DisplayMetrics metrics = new DisplayMetrics();    getWindowManager().getDefaultDisplay().getMetrics(metrics);    deviceWidth = metrics.widthPixels;    deviceHeight = metrics.heightPixels;    Circle circle = new Circle(this, deviceWidth / 2, deviceHeight / 2, deviceWidth / 8);    Line line = new Line(this, deviceWidth / 2, deviceHeight / 2, deviceWidth / 8);    container.addView(line);

2. 创建一个自定义的View

import android.content.Context;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.PointF;import android.view.View;public class Line extends View {    private Paint mPaint;    private PointF startPointF;    private PointF endPointF;    private PointF controlPointF1, controlPointF2;    private PointF startPointF2;    private PointF endPointF2;    private PointF controlPointF3, controlPointF4;    public Line(Context context, float x, float y, float radius) {        super(context);        double d = (2 * Math.sqrt(2) - 1);        this.startPointF = new PointF(x, y - radius);        this.endPointF = new PointF(x, y + radius / 10);        this.controlPointF1 = new PointF(x, (float) (y - d * radius));        this.controlPointF2 = new PointF((float) (x + d * radius), (float) (y - d * radius));        this.startPointF2 = new PointF(x, y - radius);        this.endPointF2 = new PointF(x, y + radius / 10);        this.controlPointF3 = new PointF(x, (float) (y - d * radius));        this.controlPointF4 = new PointF((float) (x - d * radius), (float) (y - d * radius));        this.mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        this.mPaint.setColor(Color.WHITE);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);        //绘制贝塞尔曲线        Path path = new Path();        path.moveTo(startPointF.x, startPointF.y);        path.cubicTo(controlPointF1.x, controlPointF1.y, controlPointF2.x, controlPointF2.y, endPointF.x, endPointF.y);        canvas.drawPath(path, mPaint);        path.moveTo(startPointF2.x, startPointF2.y);        path.cubicTo(controlPointF3.x, controlPointF3.y, controlPointF4.x, controlPointF4.y, endPointF2.x, endPointF2.y);        canvas.drawPath(path, mPaint);    }}

运行效果

Android使用贝塞尔曲线画心形_第1张图片

Android使用贝塞尔曲线画心形

Android使用贝塞尔曲线画心形

1. 创建一个Activity

2. 创建一个自定义的View

运行效果

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