浪漫表白心形花瓣动图

创建工具类MyUtil
public class MyUtil {public static float circle = (float) (2 * Math.PI);public static int rgba(int r, int g, int b, int a) {return Color.argb(a, r, g, b);}public static int randomInt(int min, int max) {return (int) Math.floor(Math.random() * (max - min + 1)) + min;}public static float random(float min, float max) {return (float) (Math.random() * (max - min) + min);}//产生随机的argb颜色public static int randomrgba(int rmin, int rmax, int gmin, int gmax, int bmin, int bmax, int a) {int r = Math.round(random(rmin, rmax));int g = Math.round(random(gmin, gmax));int b = Math.round(random(bmin, bmax));int limit = 5;if (Math.abs(r - g) <= limit && Math.abs(g - b) <= limit && Math.abs(b - r) <= limit) {return rgba(rmin, rmax, gmin, gmax);} else {return rgba(r, g, b, a);}}//角度转弧度public static float degrad(float angle) {return circle / 360 * angle;}}

创建工具类Point
public class Point {public int x;public int y;public Point(int x, int y) {this.x = x;this.y = y;}//旋转public Point rotate(float theta) {int x = this.x;int y = this.y;this.x = (int) (Math.cos(theta) * x - Math.sin(theta) * y);this.y = (int) (Math.sin(theta) * x + Math.cos(theta) * y);return this;}//乘以一个常数public Point mult(float f) {this.x *= f;this.y *= f;return this;}//复制public Point clone() {return new Point(this.x, this.y);}//该点与圆心距离public float length() {return (float) Math.sqrt(this.x * this.x + this.y * this.y);}//向量相减public Point subtract(Point p) {this.x -= p.x;this.y -= p.y;return this;}//向量相加public Point add(Point p) {this.x += p.x;this.y += p.y;return this;}public Point set(int x, int y) {this.x = x;this.y = y;return this;}}

public class Petal {private float stretchA;//第一个控制点延长线倍数private float stretchB;//第二个控制点延长线倍数private float startAngle;//起始旋转角，用于确定第一个端点private float angle;//两条线之间夹角，由起始旋转角和夹角可以确定第二个端点private int radius = 2;//花芯的半径private float growFactor;//增长因子，花瓣是有开放的动画效果，这个参数决定花瓣展开速度private int color;//花瓣颜色private boolean isFinished = false;//花瓣是否绽放完成private Path path = new Path();//用于保存三次贝塞尔曲线private Paint paint = new Paint();//画笔//构造函数，由花朵类调用public Petal(float stretchA, float stretchB, float startAngle, float angle, int color, float growFactor) {this.stretchA = stretchA;this.stretchB = stretchB;this.startAngle = startAngle;this.angle = angle;this.color = color;this.growFactor = growFactor;paint.setColor(color);}//用于渲染花瓣，通过不断更改半径使得花瓣越来越大public void render(Point p, int radius, Canvas canvas) {if (this.radius <= radius) {this.radius += growFactor; // / 10;} else {isFinished = true;}this.draw(p, canvas);}//绘制花瓣，参数p是花芯的圆心的坐标private void draw(Point p, Canvas canvas) {if (!isFinished) {path = new Path();//将向量（0，radius）旋转起始角度，第一个控制点根据这个旋转后的向量计算Point t = new Point(0, this.radius).rotate(MyUtil.degrad(this.startAngle));//第一个端点，为了保证圆心不会随着radius增大而变大这里固定为3Point v1 = new Point(0, 3).rotate(MyUtil.degrad(this.startAngle));//第二个端点Point v2 = t.clone().rotate(MyUtil.degrad(this.angle));//延长线，分别确定两个控制点Point v3 = t.clone().mult(this.stretchA);Point v4 = v2.clone().mult(this.stretchB);//由于圆心在p点，因此，每个点要加圆心坐标点v1.add(p);v2.add(p);v3.add(p);v4.add(p);path.moveTo(v1.x, v1.y);//参数分别是：第一个控制点，第二个控制点，终点path.cubicTo(v3.x, v3.y, v4.x, v4.y, v2.x, v2.y);}canvas.drawPath(path, paint);}
}

public class Garden {//创建一个随机的花朵public Bloom createRandomBloom(int x, int y) {//创建一个随机的花朵半径int radius = MyUtil.randomInt(Options.minBloomRadius, Options.maxBloomRadius);//创建一个随机的花朵颜色int color = MyUtil.randomrgba(Options.minRedColor, Options.maxRedColor, Options.minGreenColor, Options.maxGreenColor, Options.minBlueColor, Options.maxBlueColor, Options.opacity);//创建随机的花朵中花瓣个数int petalCount = MyUtil.randomInt(Options.minPetalCount, Options.maxPetalCount);return createBloom(x, y, radius, color, petalCount);}//创建花朵public Bloom createBloom(int x, int y, int radius, int color, int petalCount) {return new Bloom(new Point(x, y), radius, color, petalCount);}static class Options {//用于控制产生随机花瓣个数范围public static int minPetalCount = 8;public static int maxPetalCount = 15;//用于控制产生延长线倍数范围public static float minPetalStretch = 2f;public static float maxPetalStretch = 3.5f;//用于控制产生随机增长因子范围,增长因子决定花瓣绽放速度public static float minGrowFactor = 1f;public static float maxGrowFactor = 1.1f;//用于控制产生花朵半径随机数范围public static int minBloomRadius = 8;public static int maxBloomRadius = 10;//用于产生随机颜色public static int minRedColor = 128;public static int maxRedColor = 255;public static int minGreenColor = 0;public static int maxGreenColor = 128;public static int minBlueColor = 0;public static int maxBlueColor = 128;//花瓣的透明度public static int opacity = 50;//0.1}
}

public class Bloom {private int color;//整个花朵的颜色private Point point;//花芯圆心private int radius; //花芯半径private ArrayList<Petal> petals;//用于保存花瓣public Point getPoint() {return point;}public Bloom(Point point, int radius, int color, int petalCount) {this.point = point;this.radius = radius;this.color = color;petals = new ArrayList<>(petalCount);float angle = 360f / petalCount;int startAngle = MyUtil.randomInt(0, 90);for (int i = 0; i < petalCount; i++) {//随机产生第一个控制点的拉伸倍数float stretchA = MyUtil.random(Garden.Options.minPetalStretch, Garden.Options.maxPetalStretch);//随机产生第二个控制地的拉伸倍数float stretchB = MyUtil.random(Garden.Options.minPetalStretch, Garden.Options.maxPetalStretch);//计算每个花瓣的起始角度int beginAngle = startAngle + (int) (i * angle);//随机产生每个花瓣的增长因子（即绽放速度）float growFactor = MyUtil.random(Garden.Options.minGrowFactor, Garden.Options.maxGrowFactor);//创建一个花瓣，并添加到花瓣列表中this.petals.add(new Petal(stretchA, stretchB, beginAngle, angle, color, growFactor));}}//绘制花朵public void draw(Canvas canvas) {Petal p;for (int i = 0; i < this.petals.size(); i++) {p = petals.get(i);//渲染每朵花朵p.render(point, this.radius, canvas);}}public int getColor() {return color;}}自定义view
public class HeartView extends SurfaceView implements SurfaceHolder.Callback {SurfaceHolder surfaceHolder;int offsetX;int offsetY;private Garden garden;private int width;private int height;private Paint backgroundPaint;private boolean isDrawing = false;private Bitmap bm;private Canvas canvas;private int heartRadio = 1;public HeartView(Context context) {super(context);init();}public HeartView(Context context, AttributeSet attrs) {super(context, attrs);init();}private void init() {surfaceHolder = getHolder();surfaceHolder.addCallback(this);garden = new Garden();backgroundPaint = new Paint();backgroundPaint.setColor(Color.rgb(0xff, 0xff, 0xe0));}ArrayList<Bloom> blooms = new ArrayList<>();public Point getHeartPoint(float angle) {float t = (float) (angle / Math.PI);float x = (float) (heartRadio * (16 * Math.pow(Math.sin(t), 3)));float y = (float) (-heartRadio * (13 * Math.cos(t) - 5 * Math.cos(2 * t) - 2 * Math.cos(3 * t) - Math.cos(4 * t)));return new Point(offsetX + (int) x, offsetY + (int) y);}//绘制列表里所有的花朵private void drawHeart() {canvas.drawRect(0, 0, width, height, backgroundPaint);for (Bloom b : blooms) {b.draw(canvas);}Canvas c = surfaceHolder.lockCanvas();try {c.drawBitmap(bm, 0, 0, null);}catch (Exception e){e.printStackTrace();}surfaceHolder.unlockCanvasAndPost(c);}public void reDraw() {blooms.clear();drawOnNewThread();}@Overridepublic void draw(Canvas canvas) {super.draw(canvas);}//开启一个新线程绘制private void drawOnNewThread() {new Thread() {@Overridepublic void run() {if (isDrawing) return;isDrawing = true;float angle = 10;while (true) {Bloom bloom = getBloom(angle);if (bloom != null) {blooms.add(bloom);}if (angle >= 30) {break;} else {angle += 0.2;}drawHeart();try {sleep(20);} catch (InterruptedException e) {e.printStackTrace();}}isDrawing = false;}}.start();}private Bloom getBloom(float angle) {Point p = getHeartPoint(angle);boolean draw = true;/**循环比较新的坐标位置是否可以创建花朵,* 为了防止花朵太密集* */for (int i = 0; i < blooms.size(); i++) {Bloom b = blooms.get(i);Point bp = b.getPoint();float distance = (float) Math.sqrt(Math.pow(p.x - bp.x, 2) + Math.pow(p.y - bp.y, 2));if (distance < Garden.Options.maxBloomRadius * 1.5) {draw = false;break;}}//如果位置间距满足要求，就在该位置创建花朵并将花朵放入列表if (draw) {Bloom bloom = garden.createRandomBloom(p.x, p.y);return bloom;}return null;}@Overridepublic void surfaceCreated(SurfaceHolder holder) {}@Overridepublic void surfaceChanged(SurfaceHolder holder, int format, int width, int height) {this.width = width;this.height = height;//我的手机宽度像素是1080，发现参数设置为30比较合适，这里根据不同的宽度动态调整参数heartRadio = width * 30 / 1080;offsetX = width / 2;offsetY = height / 2 - 55;bm = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);canvas = new Canvas(bm);drawOnNewThread();}@Overridepublic void surfaceDestroyed(SurfaceHolder holder) {}
}

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