[reportlab-users] diagonal ShadedRect and Clipping ?

[Dirk Datzert]

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Hi Robin,

based on ShadedPolygon and did the orientation-mode 'diagonalup' and
'diagonaldown' for ShadedRect.

I don't know if it will be made much sense for you to integrate this
really into grids.py since ShadedPolygon is experimental. And second it
is double depended class ShadedRect is used in ShadedPolygon and
ShadedPolygon is used in ShadedRect :-)) ???

Regards,
Dirk
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@@ -334,7 +332,7 @@
         y = AttrMapValue(isNumber, desc="The grid's lower-left y position."),
         width = AttrMapValue(isNumber, desc="The grid's width."),
         height = AttrMapValue(isNumber, desc="The grid's height."),
-        orientation = AttrMapValue(OneOf(('vertical', 'horizontal')), desc='Determines if stripes are vertical or horizontal.'),
+        orientation = AttrMapValue(OneOf(('vertical', 'horizontal', 'diagonalup', 'diagonaldown')), desc='Determines if stripes are vertical or horizontal.'),
         numShades = AttrMapValue(isNumber, desc='The number of interpolating colors.'),
         fillColorStart = AttrMapValue(isColorOrNone, desc='Start value of the color shade.'),
         fillColorEnd = AttrMapValue(isColorOrNone, desc='End value of the color shade.'),
@@ -384,6 +381,27 @@
         return x, y, width, height, fillColorStart, fillColorEnd
 
     def draw(self):
+        # check orientation diagonal !
+        if self.orientation[:8] == 'diagonal':
+            from math import sqrt, acos, pi
+
+            sp = ShadedPolygon()
+
+            for k in 'fillColorStart', 'fillColorEnd', 'strokeColor', 'strokeWidth', 'numShades', 'cylinderMode':
+                setattr(sp,k,getattr(self,k))
+
+            w,h = self.width,self.height
+            d = sqrt(w**2+h**2)
+
+            sp.angle = acos(w/d)/pi*180
+
+            if self.orientation[-4:] == 'down':
+                sp.angle = -sp.angle
+
+            sp.points = [self.x,self.y,self.x+self.width,self.y,self.x+self.width,self.y+self.height,self.x,self.y+self.height]
+
+            return sp.draw()
+
         # general widget bits
         group = Group()
         x, y, w, h, fillColorStart, fillColorEnd = self._flipRectCorners()

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