further improvements for the HTML parser

lib/devel/graphics.nim

@@ -0,0 +1,67 @@
+#
+#
+#            Nimrod's Runtime Library
+#        (c) Copyright 2010 Andreas Rumpf
+#
+#    See the file "copying.txt", included in this
+#    distribution, for details about the copyright.
+#
+
+## This module implements graphical output for Nimrod; the current
+## implementation uses Cairo under the surface. 
+
+type
+  PSurface* = ref TSurface
+  TSurface {.pure, final.} = object
+    ... # internal data
+  
+  
+  TRect* = tuple[x, y, width, height: int]
+  TPoint* = tuple[x, y: int]
+  
+  TColor* = distinct int ## a color stored as RGB
+
+proc `==` (a, b: TColor): bool {.borrow.}
+# XXX maybe other operations for colors? What about saturated artithmetic?
+
+
+const
+  colRed* = TColor(0x00ff0000) # RGB
+  colGreen* = ...
+  colBlue* = ...
+  colOrange* = ...
+  
+proc newSurface*(width, height: int): PSurface
+  
+proc color*(name: string): TColor
+proc isColor*(name: string): bool
+
+proc rgb*(r, g, b: range[0..255]): TColor
+
+
+proc drawRect*(sur: PSurface, r: TRect, col: TColor)
+proc fillRect*(sur: PSurface, r: TRect, col: TColor)
+
+proc drawCircle*(sur: PSurface, mid: TPoint, radius: int)
+proc drawCircle*(sur: PSurface, r: TRect)
+
+proc fillCircle*(sur: PSurface, mid: TPoint, radius: int)
+proc fillCircle*(sur: PSurface, r: TRect)
+
+proc drawElipse*(sur: PSurface, r: TRect)
+proc fillElipse*(sur: PSurface, r: TRect)
+
+
+proc textBounds*(text: string): tuple[len, height: int]
+proc drawText*(sur: PSurface, p: TPoint, text: string)
+
+proc drawLine*(sur: PSurface, a, b: TPoint)
+
+proc `[]`*(sur: PSurface, p: TPoint): TColor
+proc `[,]`*(sur: PSurface, x, y: int): TColor
+proc `[]=`*(sur: PSurface, p: TPoint, col: TColor)
+proc `[,]=`*(sur: PSurface, x, y: int, col: TColor)
+
+proc writeToPNG*(sur: PSurface, filename: string)
+
+