Existing shape routines have been reimplemented

artist/shapes/doc.go

@@ -1,6 +1,6 @@
 // Package shapes provides some basic shape drawing routines.
 //
-// A word about patterns:
+// A word about using patterns with shape routines:
 //
 // Most drawing routines have a version that samples from other canvases, and a
 // version that samples from a solid color. None of these routines can use

artist/shapes/ellipse.go

@@ -3,19 +3,25 @@ package shapes
 import "math"
 import "image"
 import "image/color"
-import "git.tebibyte.media/sashakoshka/tomo/artist"
+// import "git.tebibyte.media/sashakoshka/tomo/artist"
 import "git.tebibyte.media/sashakoshka/tomo/canvas"
 
-// FillEllipse draws a filled ellipse with the specified pattern.
+// FillEllipse draws the content of one canvas onto another, clipped by an
+// ellipse stretched to the bounds of the source canvas. The offset point
+// defines where the origin point of the source canvas is positioned in relation
+// to the origin point of the destination canvas. To prevent the entire source
+// canvas's bounds from being used, it must be cut with canvas.Cut().
 func FillEllipse (
 	destination canvas.Canvas,
-	source artist.Pattern,
+	source      canvas.Canvas,
-	bounds image.Rectangle,
+	offset      image.Point,
 ) (
 	updatedRegion image.Rectangle,
 ) {
-	bounds = bounds.Canon()
+	dstData, dstStride := destination.Buffer()
-	data, stride := destination.Buffer()
+	srcData, srcStride := source.Buffer()
+	
+	bounds := source.Bounds()
 	realWidth, realHeight := bounds.Dx(), bounds.Dy()
 	bounds = bounds.Intersect(destination.Bounds()).Canon()
 	if bounds.Empty() { return }