public static void BoundRectTransform(RectTransform bounded,
RectTransform bounds,
RectTransform extent=null)
{
extent = extent ?? bounded; // allow you to bound less than the whole assembly
// work in world space because it's easier
var extentRect = extent.GetWorldRect();
var boundsRect = bounds.GetWorldRect();
// push the tooltip rect into the division
float pushR = Mathf.Max(0f, boundsRect.xMin - extentRect.xMin);
float pushU = Mathf.Max(0f, boundsRect.yMin - extentRect.yMin);
float pushL = Mathf.Min(0f, boundsRect.xMax - extentRect.xMax);
float pushD = Mathf.Min(0f, boundsRect.yMax - extentRect.yMax);
var push = new Vector2(pushL + pushR, pushU + pushD);
bounded.position += (Vector3) push;
}
/// <summary>
/// Reposition the tooltip so that it is within the bounds but not within
/// the source
/// </summary>
public static void RepositionTooltip(RectTransform tooltip,
RectTransform source,
RectTransform bounds,
RectTransform extent=null,
TooltipBias bias=TooltipBias.Down)
{
Vector3 position = source.GetWorldRect().center;
position.z = tooltip.position.z;
tooltip.position = position;
extent = extent ?? tooltip; // allow you to bound less than the whole assembly
// work in world space because it's easier
var extentRect = extent.GetWorldRect();
var sourceRect = source.GetWorldRect();
var boundsRect = bounds.GetWorldRect();
// divide the bounds into four overlapping rectangles on each side of
// the source rect
var xMinRect = Rect.MinMaxRect(boundsRect.xMin, boundsRect.yMin,
sourceRect.xMin, boundsRect.yMax);
var yMinRect = Rect.MinMaxRect(boundsRect.xMin, boundsRect.yMin,
boundsRect.xMax, sourceRect.yMin);
var xMaxRect = Rect.MinMaxRect(sourceRect.xMax, boundsRect.yMin,
boundsRect.xMax, boundsRect.yMax);
var yMaxRect = Rect.MinMaxRect(boundsRect.xMin, sourceRect.yMax,
boundsRect.xMax, boundsRect.yMax);
Rect[] rects;
if (bias == TooltipBias.Down)
{
rects = new[] { yMinRect, yMaxRect, xMinRect, xMaxRect };
}
else if (bias == TooltipBias.Up)
{
rects = new[] { yMaxRect, yMinRect, xMinRect, xMaxRect };
}
else if (bias == TooltipBias.Left)
{
rects = new[] { xMinRect, xMaxRect, yMinRect, yMaxRect };
}
else
{
rects = new[] { xMaxRect, xMinRect, yMinRect, yMaxRect };
}
// bounds bounds
//+------------------------+ +--------+--------+------+
//| | | | | |
//| | | | | |
//| yMax | | xMin | | xMax |
//| | | | | |
//| | | | | |
//+--------+--------+------+ | +--------+ |
//| | | | | | | |
//| | source | | | | source | |
//| | | | | | | |
//+--------+--------+------+ | +--------+ |
//| yMin | | | | |
//| | | | | |
//+------------------------+ +--------+--------+------+
// find the first division in which the tooltip rect will fit
for (int i = 0; i < rects.Length; ++i)
{
Rect rect = rects[i];
if (extentRect.width <= rect.width
&& extentRect.height <= rect.height)
{
// push the tooltip rect into the division
float pushR = Mathf.Max(0f, rect.xMin - extentRect.xMin);
float pushU = Mathf.Max(0f, rect.yMin - extentRect.yMin);
float pushL = Mathf.Min(0f, rect.xMax - extentRect.xMax);
float pushD = Mathf.Min(0f, rect.yMax - extentRect.yMax);
var push = new Vector2(pushL + pushR, pushU + pushD);
tooltip.position += (Vector3) push;
break;
}
}
}