/// <summary>
/// Create a cursor icon with a shape that visually represents the tool's thickness.
/// </summary>
/// <param name="imgName">A string containing the name of the tool's icon image to use.</param>
/// <param name="shape">The shape to draw.</param>
/// <param name="shapeWidth">The width of the shape.</param>
/// <param name="imgToShapeX">The horizontal distance between the image's top-left corner and the shape center.</param>
/// <param name="imgToShapeY">The verical distance between the image's top-left corner and the shape center.</param>
/// <param name="shapeX">The X position in the returned Pixbuf that will be the center of the shape.</param>
/// <param name="shapeY">The Y position in the returned Pixbuf that will be the center of the shape.</param>
/// <returns>The new cursor icon with an shape that represents the tool's thickness.</returns>
public static Gdk.Pixbuf CreateIconWithShape(string imgName, CursorShape shape, int shapeWidth,
int imgToShapeX, int imgToShapeY,
out int shapeX, out int shapeY)
{
Gdk.Pixbuf img = PintaCore.Resources.GetIcon(imgName);
double zoom = 1d;
if (PintaCore.Workspace.HasOpenDocuments)
{
zoom = Math.Min(30d, PintaCore.Workspace.ActiveDocument.Workspace.Scale);
}
shapeWidth = (int)Math.Min(800d, ((double)shapeWidth) * zoom);
int halfOfShapeWidth = shapeWidth / 2;
// Calculate bounding boxes around the both image and shape
// relative to the image top-left corner.
Gdk.Rectangle imgBBox = new Gdk.Rectangle(0, 0, img.Width, img.Height);
Gdk.Rectangle shapeBBox = new Gdk.Rectangle(
imgToShapeX - halfOfShapeWidth,
imgToShapeY - halfOfShapeWidth,
shapeWidth,
shapeWidth);
// Inflate shape bounding box to allow for anti-aliasing
shapeBBox.Inflate(2, 2);
// To determine required size of icon,
// find union of the image and shape bounding boxes
// (still relative to image top-left corner)
Gdk.Rectangle iconBBox = imgBBox.Union(shapeBBox);
// Image top-left corner in icon co-ordinates
int imgX = imgBBox.Left - iconBBox.Left;
int imgY = imgBBox.Top - iconBBox.Top;
// Shape center point in icon co-ordinates
shapeX = imgToShapeX - iconBBox.Left;
shapeY = imgToShapeY - iconBBox.Top;
using (var i = CairoExtensions.CreateImageSurface(Cairo.Format.ARGB32, iconBBox.Width, iconBBox.Height)) {
using (var g = new Cairo.Context(i)) {
// Don't show shape if shapeWidth less than 3,
if (shapeWidth > 3)
{
int diam = Math.Max(1, shapeWidth - 2);
Cairo.Rectangle shapeRect = new Cairo.Rectangle(shapeX - halfOfShapeWidth,
shapeY - halfOfShapeWidth,
diam,
diam);
Cairo.Color outerColor = new Cairo.Color(255, 255, 255, 0.75);
Cairo.Color innerColor = new Cairo.Color(0, 0, 0);
switch (shape)
{
case CursorShape.Ellipse:
g.DrawEllipse(shapeRect, outerColor, 2);
shapeRect = shapeRect.Inflate(-1, -1);
g.DrawEllipse(shapeRect, innerColor, 1);
break;
case CursorShape.Rectangle:
g.DrawRectangle(shapeRect, outerColor, 1);
shapeRect = shapeRect.Inflate(-1, -1);
g.DrawRectangle(shapeRect, innerColor, 1);
break;
}
}
// Draw the image
g.DrawPixbuf(img, new Cairo.Point(imgX, imgY));
}
return(CairoExtensions.ToPixbuf(i));
}
}
