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/**
* Copyright: Mike Wey 2011
* License: zlib (See accompanying LICENSE file)
* Authors: Mike Wey
*/
module dmagick.DrawingContext;
import dmagick.Image;
import dmagick.c.geometry;
class DrawingContext
{
private void delegate(Image)[] actions;
//Image property changes that need undoing.
private void delegate(Image)[string] undo;
/**
* Apply the drawing context to the image.
*/
void draw(Image image)
{
undo = null;
foreach ( action; actions )
action(image);
foreach ( u; undo )
u(image);
}
/**
* Specify a transformation matrix to adjust scaling, rotation, and
* translation (coordinate transformation) for subsequently drawn
* objects in the drawing context.
*/
void affine(AffineMatrix affine)
{
AffineMatrix oldAffine;
actions ~= (Image image)
{
if ( "affine" !in undo )
{
oldAffine = image.options.affine;
undo["affine"] = (Image image)
{
image.options.affine = oldAffine;
};
}
image.options.affine = affine;
};
}
/**
* Transforms the image as specified by the affine matrix.
*/
void affineTransform(AffineMatrix affine)
{
actions ~= (Image image)
{
image.affineTransform(affine);
};
}
}
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