本文主要是介绍彩票View的实现,希望对大家解决编程问题提供一定的参考价值,需要的开发者们随着小编来一起学习吧!
Android 实现Lotto彩票池View的实现
项目地址:https://github.com/Warkey1991/Jackview
最近项目中需要用到一个类似彩票池的效果View
上图看上去还是很简单的,下面我就分析一下实现的原理:
- 绘制黑色背景圆
- 绘制中间的圆弧以及文字
- 绘制内边圆
- 绘制里面的小球(此处比较复杂点)
- 绘制进度圆弧
1.绘制黑色圆背景
就是简单的绘制圆的方法,实心圆只需要将画笔设置为
paint.setStyle(Paint.Style.FILL_AND_STROKE);
即可。
2.绘制中间圆弧
此处需要计算每段圆弧的间距,此处我将每段间距设置为10度,见代码
//绘制圆弧rectF.set(-midRadius, -midRadius, midRadius, midRadius);canvas.drawArc(rectF, -85, 80, false, linePaint); //5canvas.drawArc(rectF, 5, 80, false, linePaint); //10---- 85canvas.drawArc(rectF, 95, 80, false, linePaint);canvas.drawArc(rectF, 185, 80, false, linePaint);
3.绘制文字,
设计绘制文本的时候,需要注意的是确定x,y的值。
canvas.drawText("0", -textPaint.measureText("0") / 2, -midRadius + getTextDiffY(textPaint), textPaint);canvas.drawText("30", midRadius - textPaint.measureText("30") / 2, getTextDiffY(textPaint), textPaint);canvas.drawText("60", -textPaint.measureText("60") / 2, midRadius + getTextDiffY(textPaint), textPaint);canvas.drawText("90", -midRadius - textPaint.measureText("90") / 2, getTextDiffY(textPaint), textPaint);
这里,先确定x的位置,只要将x的坐标减去文本的宽度的一半就OK了;y 的位置稍微复杂点,
Paint.FontMetrics fontMetrics = paint.getFontMetrics();return Math.abs(fontMetrics.descent - fontMetrics.ascent) / 2 - fontMetrics.descent;
确定文本的基线,然后进行绘制就OK了。
4.绘制文本处的短线,
简单粗暴直接代码之
//绘制直线canvas.drawLine(0, -innerRaduis, 0, -midRadius + lineLength, linePaint);canvas.drawLine(innerRaduis, 0, midRadius - lineLength, 0, linePaint);canvas.drawLine(0, innerRaduis, 0, midRadius - lineLength, linePaint);canvas.drawLine(-innerRaduis, 0, -midRadius + lineLength, 0, linePaint);
5.绘制内圆圈
就是绘制圆,将画笔设置为只绘制边框即可
linePaint.setStyle(Paint.Style.STROKE);
6.绘制内部的圆球
以最下面最居中的那个球为基点,先设置球的半径,绘制下面一圈的球,根据球的半径算出每个球所占的角度,涉及到三角函数的知识,(后期补上图做说明)。
float r = dip2px(18);float midBallDiffY = innerRaduis - dip2px(2) - r;float minInnerRadius = midBallDiffY - r * 2;double eachMidArc = Math.toDegrees(Math.asin(r * 1.0d / midBallDiffY)) * 2;double eachInnerArc = Math.toDegrees(Math.asin(r * 1.0d / minInnerRadius)) * 2;
先绘制最下面一圈
for (int i = 5; i > 0; i--) {Ball ballX = new Ball();float x = (float) ((innerRaduis - dip2px(2) - r) * (Math.sin(Math.toRadians(eachMidArc * (5 - i)))));float y = (float) ((innerRaduis - dip2px(2) - r) * (Math.cos(Math.toRadians(eachMidArc * (5 - i)))));ballX.cx = x;ballX.cy = y;ballX.num = String.valueOf(random.nextInt(69) + 1);ballX.rotateDegress = random.nextInt(90) + 10;canvas.drawCircle(ballX.cx, ballX.cy, ballX.radius, dashPaint);canvas.rotate(ballX.rotateDegress, x, y);canvas.drawText(ballX.num, x - textPaint.measureText(ballX.num) / 2, y + getTextDiffY(textPaint), textPaint);canvas.rotate(-ballX.rotateDegress, x, y);}for (int i = 4; i > 0; i--) {Ball ballX = new Ball();float x = -(float) ((innerRaduis - dip2px(2) - r) * (Math.sin(Math.toRadians(eachMidArc * (5 - i)))));float y = (float) ((innerRaduis - dip2px(2) - r) * (Math.cos(Math.toRadians(eachMidArc * (5 - i)))));ballX.cx = x;ballX.cy = y;ballX.num = String.valueOf(random.nextInt(69) + 1);canvas.drawCircle(ballX.cx, ballX.cy, ballX.radius, dashPaint);ballX.rotateDegress = random.nextInt(90) + 10;canvas.rotate(ballX.rotateDegress, x, y);canvas.drawText(ballX.num, x - textPaint.measureText(ballX.num) / 2, y + getTextDiffY(textPaint), textPaint);canvas.rotate(-ballX.rotateDegress, x, y);}
然后绘制上面的一圈
for (int i = 3; i > 0; i--) {Ball ballX = new Ball();float x = (float) (minInnerRadius * (Math.sin(Math.PI * (eachInnerArc * (3 - i) / 180.0f))));float y = (float) (minInnerRadius * (Math.cos(Math.PI * (eachInnerArc * (3 - i) / 180.0f))));ballX.cx = x;ballX.cy = y;ballX.num = String.valueOf(random.nextInt(69) + 1);ballX.rotateDegress = random.nextInt(90) + 10;canvas.drawCircle(ballX.cx, ballX.cy, ballX.radius, dashPaint);canvas.rotate(ballX.rotateDegress, x, y);canvas.drawText(ballX.num, x - textPaint.measureText(ballX.num) / 2, y + getTextDiffY(textPaint), textPaint);canvas.rotate(-ballX.rotateDegress, x, y);}for (int i = 2; i > 0; i--) {Ball ballX = new Ball();float x = -(float) (minInnerRadius * (Math.sin(Math.PI * (eachInnerArc * (3 - i) / 180.0f))));float y = (float) (minInnerRadius * (Math.cos(Math.PI * (eachInnerArc * (3 - i) / 180.0f))));ballX.cx = x;ballX.cy = y;ballX.num = String.valueOf(random.nextInt(69) + 1);ballX.rotateDegress = random.nextInt(90) + 10;canvas.drawCircle(ballX.cx, ballX.cy, ballX.radius, dashPaint);canvas.rotate(ballX.rotateDegress, x, y);canvas.drawText(ballX.num, x - textPaint.measureText(ballX.num) / 2, y + getTextDiffY(textPaint), textPaint);canvas.rotate(-ballX.rotateDegress, x, y);}
看到效果图,每个球的文本都有一个角度的,关键代码将画笔旋转,绘制后再回位。
canvas.rotate(ballX.rotateDegress, x, y);canvas.drawText(ballX.num, x - textPaint.measureText(ballX.num) / 2, y + getTextDiffY(textPaint), textPaint);canvas.rotate(-ballX.rotateDegress, x, y);
7.绘制进度条
public class LottoCircleProgressView extends View {private int innerRaduis = 200;private Paint progressPaint = new Paint(Paint.ANTI_ALIAS_FLAG);private int progress = 0;private RectF arcRectf = new RectF();private Bitmap iconBitmap;private Rect bitmapRect;public LottoCircleProgressView(Context context) {this(context, null);}public LottoCircleProgressView(Context context, AttributeSet attrs) {this(context, attrs, 0);}public LottoCircleProgressView(Context context, AttributeSet attrs, int defStyle) {super(context, attrs, defStyle);progressPaint.setColor(0xFFF7A400);progressPaint.setAntiAlias(true);progressPaint.setStrokeCap(Paint.Cap.ROUND);progressPaint.setStrokeJoin(Paint.Join.ROUND);progressPaint.setStyle(Paint.Style.STROKE);progressPaint.setStrokeWidth(dip2px(4));iconBitmap = BitmapFactory.decodeResource(context.getResources(), R.mipmap.ic_progress_ball);bitmapRect = new Rect();}@Overrideprotected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {super.onMeasure(widthMeasureSpec, heightMeasureSpec);int width = MeasureSpec.getSize(widthMeasureSpec);int height = MeasureSpec.getSize(heightMeasureSpec);int size = Math.min(width, height);setMeasuredDimension(size, size);innerRaduis = size / 2 - dip2px(30);}@Overrideprotected void onDraw(Canvas canvas) {canvas.translate(getWidth() / 2, getHeight() / 2);arcRectf.set(-innerRaduis, -innerRaduis, innerRaduis, innerRaduis);canvas.drawArc(arcRectf, -90, progress, false, progressPaint);int left = (int) (innerRaduis * Math.sin(Math.PI * (double) (progress * 1.0f / 180)) - (iconBitmap.getWidth() + 20) / 2);int top = (int) (-innerRaduis * Math.cos(Math.PI * (double) (progress * 1.0f / 180)) - (iconBitmap.getHeight() + 20) / 2);int right = (int) (innerRaduis * Math.sin(Math.PI * (double) (progress * 1.0f / 180)) + (iconBitmap.getWidth() + 20) / 2);int bottom = (int) (-innerRaduis * Math.cos(Math.PI * (double) (progress * 1.0f / 180)) + (iconBitmap.getHeight() + 20) / 2);bitmapRect.set(left, top, right, bottom);canvas.drawBitmap(iconBitmap, null, bitmapRect, null);super.onDraw(canvas);}public static int dip2px(float dipValue) {final float scale = Resources.getSystem().getDisplayMetrics().density;return (int) (dipValue * scale + 0.5f);}@Overrideprotected void onAttachedToWindow() {super.onAttachedToWindow();startProgressAnim();}@Overrideprotected void onDetachedFromWindow() {super.onDetachedFromWindow();clearAnimation();}private void startProgressAnim() {ValueAnimator valueAnimator = ValueAnimator.ofInt(0, 360);valueAnimator.setDuration(60000);valueAnimator.setInterpolator(new LinearInterpolator());valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {@Overridepublic void onAnimationUpdate(ValueAnimator animation) {progress = ((int) animation.getAnimatedValue());invalidate();}});valueAnimator.setRepeatCount(ValueAnimator.INFINITE);valueAnimator.setRepeatMode(ValueAnimator.RESTART);valueAnimator.start();}}
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