/// <summary>
/// 检查矩形与圆形是否发生了碰撞
/// </summary>
///
/// <param name="rect1"></param>
/// <param name="rect2"></param>
/// <returns></returns>
public static bool IsRectToCirc(RectBox rect1, RectBox rect2)
{
float radius = rect2.GetWidth() / 2;
Point middle = GetMiddlePoint(rect2);
Point upperLeft = new Point(rect1.GetMinX(), rect1.GetMinY());
Point upperRight = new Point(rect1.GetMaxX(), rect1.GetMinY());
Point downLeft = new Point(rect1.GetMinX(), rect1.GetMaxY());
Point downRight = new Point(rect1.GetMaxX(), rect1.GetMaxY());
bool collided = true;
if (!IsPointToLine(upperLeft, upperRight, middle, radius))
{
if (!IsPointToLine(upperRight, downRight, middle, radius))
{
if (!IsPointToLine(upperLeft, downLeft, middle, radius))
{
if (!IsPointToLine(downLeft, downRight, middle, radius))
{
collided = false;
}
}
}
}
return(collided);
}
public int GetScroll(RectBox visibleRect, int orientation, int direction)
{
int cellSize = this.GetCellSize();
double scrollPos = 0.0D;
if (orientation == 0)
{
if (direction < 0)
{
scrollPos = visibleRect.GetMinX();
}
else if (direction > 0)
{
scrollPos = visibleRect.GetMaxX();
}
}
else if (direction < 0)
{
scrollPos = visibleRect.GetMinY();
}
else if (direction > 0)
{
scrollPos = visibleRect.GetMaxY();
}
int increment = MathUtils.Abs((int)Math.IEEERemainder(scrollPos, cellSize));
if (increment == 0)
{
increment = cellSize;
}
return(increment);
}