public static ScaleFactor Max (ScaleFactor lhs, ScaleFactor rhs)
{
if (lhs > rhs) {
return lhs;
} else {
return lhs;
}
}
public static ScaleFactor Min (ScaleFactor lhs, ScaleFactor rhs)
{
if (lhs < rhs) {
return lhs;
} else {
return rhs;
}
}
public static ScaleFactor UseIfValid (int numerator, int denominator, ScaleFactor lastResort)
{
if (numerator <= 0 || denominator <= 0) {
return lastResort;
} else {
return new ScaleFactor (numerator, denominator);
}
}
public void Initialize(Size sourceSize, Size destinationSize)
{
if (sourceSize == source_size && destinationSize == destination_size)
return;
source_size = sourceSize;
destination_size = destinationSize;
scale_factor = new ScaleFactor (source_size.Width, destination_size.Width);
generated = false;
}
/// <summary>
/// Converts a point from window coordinates to canvas coordinates
/// </summary>
/// <param name='x'>
/// The X coordinate of the window point
/// </param>
/// <param name='y'>
/// The Y coordinate of the window point
/// </param>
public Cairo.PointD WindowPointToCanvas(double x, double y)
{
ScaleFactor sf = new ScaleFactor(PintaCore.Workspace.ImageSize.Width, PintaCore.Workspace.CanvasSize.Width);
Cairo.PointD pt = sf.ScalePoint (new Cairo.PointD(x - Offset.X, y - Offset.Y));
return new Cairo.PointD((int)pt.X, (int)pt.Y);
}
/// <summary>
/// Converts a point from canvas coordinates to window coordinates
/// </summary>
/// <param name='x'>
/// The X coordinate of the canvas point
/// </param>
/// <param name='y'>
/// The Y coordinate of the canvas point
/// </param>
public Cairo.PointD CanvasPointToWindow(double x, double y)
{
ScaleFactor sf = new ScaleFactor(PintaCore.Workspace.ImageSize.Width, PintaCore.Workspace.CanvasSize.Width);
Cairo.PointD pt = sf.UnscalePoint (new Cairo.PointD(x, y));
return new Cairo.PointD((int)(pt.X + Offset.X), (int)(pt.Y + Offset.Y));
}
private int[] CreateS2DLookupY(int srcHeight, int dstHeight, ScaleFactor scaleFactor)
{
var lookup = new int[srcHeight + 1];
for (int y = 0; y < lookup.Length; ++y) {
Gdk.Point pt = new Gdk.Point (0, y);
Gdk.Point clientPt = scaleFactor.UnscalePoint (pt);
// Sometimes the scale factor is slightly different on one axis than
// on another, simply due to accuracy. So we have to clamp this value to
// be within bounds.
lookup[y] = Utility.Clamp (clientPt.Y, 0, dstHeight - 1);
}
return lookup;
}
private int[] CreateS2DLookupX(int srcWidth, int dstWidth, ScaleFactor scaleFactor)
{
var lookup = new int[srcWidth + 1];
for (int x = 0; x < lookup.Length; ++x) {
Gdk.Point pt = new Gdk.Point (x, 0);
Gdk.Point clientPt = scaleFactor.UnscalePoint (pt);
// Sometimes the scale factor is slightly different on one axis than
// on another, simply due to accuracy. So we have to clamp this value to
// be within bounds.
lookup[x] = Utility.Clamp (clientPt.X, 0, dstWidth - 1);
}
return lookup;
}
public static ScaleFactor Max (int n1, int d1, int n2, int d2, ScaleFactor lastResort)
{
ScaleFactor a = UseIfValid (n1, d1, lastResort);
ScaleFactor b = UseIfValid (n2, d2, lastResort);
return ScaleFactor.Max (a, b);
}