private static bool GetRectAndInvertMatrix(ref P3D_Matrix matrix, ref P3D_Rect rect, int canvasW, int canvasH)
{
// Grab transformed corners
var a = matrix.MultiplyPoint(0.0f, 0.0f);
var b = matrix.MultiplyPoint(1.0f, 0.0f);
var c = matrix.MultiplyPoint(0.0f, 1.0f);
var d = matrix.MultiplyPoint(1.0f, 1.0f);
// Find min/max x/y
var xMin = Mathf.Min(Mathf.Min(a.x, b.x), Mathf.Min(c.x, d.x));
var xMax = Mathf.Max(Mathf.Max(a.x, b.x), Mathf.Max(c.x, d.x));
var yMin = Mathf.Min(Mathf.Min(a.y, b.y), Mathf.Min(c.y, d.y));
var yMax = Mathf.Max(Mathf.Max(a.y, b.y), Mathf.Max(c.y, d.y));
// Has volume?
if (xMin < xMax && yMin < yMax)
{
// Make sure rect doesn't go outside canvas
rect.XMin = Mathf.Clamp(Mathf.FloorToInt(xMin), 0, canvasW);
rect.XMax = Mathf.Clamp(Mathf.CeilToInt(xMax), 0, canvasW);
rect.YMin = Mathf.Clamp(Mathf.FloorToInt(yMin), 0, canvasH);
rect.YMax = Mathf.Clamp(Mathf.CeilToInt(yMax), 0, canvasH);
matrix = matrix.Inverse;
return(true);
}
return(false);
}
private static bool IsInsideShape(P3D_Matrix inverseMatrix, int x, int y, ref Vector2 shapeCoord)
{
shapeCoord = inverseMatrix.MultiplyPoint(x, y);
if (shapeCoord.x >= 0.0f && shapeCoord.x < 1.0f)
{
if (shapeCoord.y >= 0.0f && shapeCoord.y < 1.0f)
{
return(true);
}
}
return(false);
}
private static bool IsInsideShape(P3D_Matrix inverseMatrix, int x, int y, ref Vector2 shapeCoord)
{
shapeCoord = inverseMatrix.MultiplyPoint((float)x, (float)y);
return((shapeCoord.x >= 0f) && ((shapeCoord.x < 1f) && ((shapeCoord.y >= 0f) && (shapeCoord.y < 1f))));
}