drawRect()画矩形
- drawRect(float left, float top, float right, float bottom, @NonNull Paint paint)
- drawRect(@NonNull Rect r, @NonNull Paint paint)
- drawRect(@NonNull RectF r, @NonNull Paint paint)
两者差别就是：Rect 坐标为integer 而RectF 坐标为float
drawCricle() 画圆形
- drawCircle(float cx, float cy, float radius, @NonNull Paint paint)
radius:圆的半径
cx:圆心的x坐标
cy:圆心的y坐标
drawArc()画扇形
- drawArc(@NonNull RectF oval, float startAngle, float sweepAngle, boolean useCenter, @NonNull Paint paint)
startAngle:开始绘制的角度
sweepAngle:扇形扫过的角度,并不是停止的角度,停止的角度=startAngle+sweepAngle
userCenter:true有焦点圆形;false没有焦点圆心
drawBitmap()画Bitmap
- drawBitmap(@NonNull Bitmap bitmap, float left, float top, @Nullable Paint paint)
left:左上角横坐标
top:左上角纵坐标
drawText()画文字
- drawText(@NonNull String text, float x, float y, @NonNull Paint paint)
drawLine()画线
- drawLine(float startX, float startY, float stopX, float stopY, @NonNull Paint paint)
