public override IDrawableObject GetObjectAt(float x, float y, TransformParams t, ref float dist)
{
Utils.ThrowException(t == null ? new ArgumentNullException("t") : null);
float width = t.Transform(mWidth);
float height = t.Transform(mHeight);
Vector2DF pos = t.Transform(new Vector2DF(mX - mWidth / 2f, mY - mHeight / 2f));
return(VisualizationUtils.PointInsideRect(x, y, new RectangleF(pos.X, pos.Y, width, height)) ? this : null);
}
private static bool LineIntersectRectangle(Vector2DF pt1, Vector2DF pt2, RectangleF rect, ref Vector2DF isectPt1, ref Vector2DF isectPt2)
{
// note that this does not work properly in the case when the line lies on one of the rectangle's vertical edges
// this is not a problem for the partial rendering of lines since the rectangles are inflated prior to determining
// intersections
float y = 0, x = 0;
ArrayList <Vector2DF> points = new ArrayList <Vector2DF>(2);
if (LineIntersectVertical(pt1, pt2, rect.X, ref y))
{
if (y > rect.Y && y < rect.Y + rect.Height)
{
points.Add(new Vector2DF(rect.X, y));
}
}
if (LineIntersectVertical(pt1, pt2, rect.X + rect.Width, ref y))
{
if (y > rect.Y && y < rect.Y + rect.Height)
{
points.Add(new Vector2DF(rect.X + rect.Width, y));
}
}
if (LineIntersectHorizontal(pt1, pt2, rect.Y, ref x))
{
if (x > rect.X && x < rect.X + rect.Width)
{
points.Add(new Vector2DF(x, rect.Y));
}
}
if (LineIntersectHorizontal(pt1, pt2, rect.Y + rect.Height, ref x))
{
if (x > rect.X && x < rect.X + rect.Width)
{
points.Add(new Vector2DF(x, rect.Y + rect.Height));
}
}
if (points.Count == 2)
{
isectPt1 = points[0];
isectPt2 = points[1];
return(true);
}
else if (points.Count == 1)
{
isectPt1 = points[0];
isectPt2 = VisualizationUtils.PointInsideRect(pt1.X, pt1.Y, rect) ? pt1 : pt2;
return(true);
}
else if (VisualizationUtils.PointInsideRect(pt1.X, pt1.Y, rect) && VisualizationUtils.PointInsideRect(pt2.X, pt2.Y, rect))
{
isectPt1 = pt1;
isectPt2 = pt2;
return(true);
}
return(false);
}
public static bool IsObjectAt(Image image, float x, float y, float ptX, float ptY, TransformParams t)
{
Utils.ThrowException(t == null ? new ArgumentNullException("t") : null);
// TODO: other exceptions
float width = t.Transform(image.Width);
float height = t.Transform(image.Height);
Vector2DF pos = t.Transform(new Vector2DF(x, y));
return(VisualizationUtils.PointInsideRect(ptX, ptY, new RectangleF(pos.X, pos.Y, width, height)));
}
private static bool LineIntersectRectangle(Vector2D pt1, Vector2D pt2, RectangleF rect, ref Vector2D isect_pt1, ref Vector2D isect_pt2)
{
float y = 0, x = 0;
ArrayList <Vector2D> points = new ArrayList <Vector2D>(2);
if (LineIntersectVertical(pt1, pt2, rect.X, ref y))
{
if (y > rect.Y && y < rect.Y + rect.Height)
{
points.Add(new Vector2D(rect.X, y));
}
}
if (LineIntersectVertical(pt1, pt2, rect.X + rect.Width, ref y))
{
if (y > rect.Y && y < rect.Y + rect.Height)
{
points.Add(new Vector2D(rect.X + rect.Width, y));
}
}
if (LineIntersectHorizontal(pt1, pt2, rect.Y, ref x))
{
if (x > rect.X && x < rect.X + rect.Width)
{
points.Add(new Vector2D(x, rect.Y));
}
}
if (LineIntersectHorizontal(pt1, pt2, rect.Y + rect.Height, ref x))
{
if (x > rect.X && x < rect.X + rect.Width)
{
points.Add(new Vector2D(x, rect.Y + rect.Height));
}
}
if (points.Count == 2)
{
isect_pt1 = points[0];
isect_pt2 = points[1];
return(true);
}
else if (points.Count == 1)
{
isect_pt1 = points[0];
isect_pt2 = VisualizationUtils.PointInsideRect(pt1.X, pt1.Y, rect) ? pt1 : pt2;
return(true);
}
else if (VisualizationUtils.PointInsideRect(pt1.X, pt1.Y, rect) && VisualizationUtils.PointInsideRect(pt2.X, pt2.Y, rect))
{
isect_pt1 = pt1;
isect_pt2 = pt2;
return(true);
}
return(false);
}