/// <summary>
/// findShape searches through all the shapes on the current slide and checks to see if the
/// given x and y value falls within any of the shapes. If so, it returns that shape, if not,
/// it returns null
/// </summary>
/// <param name="x">x coordinate</param>
/// <param name="y">y coordinate</param>
/// <returns>the shape that the mouse falls on, if any</returns>
public PowerPoint.Shape findShape(int x, int y)
{
BasicForm.fPoint curPoint = new BasicForm.fPoint(x, y);
List <PowerPoint.Shape> range = allShapes(); // need to check through all shapes on the slide
// iterate through range from latest to earliest
for (int i = range.Count - 1; i >= 0; --i)
{
// once we get a hit, return it
if (pointOnShape(curPoint, range[i]))
{
return(range[i]);
}
}
//didn't find any shapes
return(null);
}
/// <summary>
/// Checks whether the input fPoint is "on" the passed shape, with error SHAPEMARGIN (should we pass in margin?)
/// </summary>
/// <param name="curPoint">a fPoint with the x and y values in PowerPoint coordinates</param>
/// <param name="shape">the PowerPoint shape. May be rotated (but not yet flipped)/</param>
/// <returns>true if the point and shape coincide, false else</returns>
internal bool pointOnShape(BasicForm.fPoint curPoint, PowerPoint.Shape shape)
{
BasicForm.fPoint p = BasicForm.rotatePointWithShape(curPoint, shape);
return(shape.Left - SHAPEMARGIN < p.x && p.x < shape.Width + shape.Left + SHAPEMARGIN &&
shape.Top - SHAPEMARGIN < p.y && p.y < shape.Top + shape.Height + SHAPEMARGIN);
}
