[reportlab-users] ShadedCircle

[Dirk Datzert]

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Hi,

out of ShadedRect and my code snippet from yesterday I made a new shaded
shape class I called ShadedCircle. It is much like ShadedRect but has
the form of circle instead.

But I don't know if grids.py would be the right place to put into
reportlab.

Regards,
Dirk
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--- grids.py.orig	Sun Aug 11 19:27:44 2002
+++ grids.py	Tue Aug 13 19:12:26 2002
@@ -320,6 +318,81 @@
         return group
 
 
+class ShadedCircle(Widget):
+    """This makes a circle with shaded colors between two colors.
+
+    Colors are interpolated linearly between 'fillColorStart'
+    and 'fillColorEnd', both of which appear at the margins.
+    If 'numShades' is set to one, though, only 'fillColorStart'
+    is used.
+    """
+
+    _attrMap = AttrMap(
+        cx = AttrMapValue(isNumber, desc="The circle's center x position."),
+        cy = AttrMapValue(isNumber, desc="The circle's center y position."),
+        radius = AttrMapValue(isNumber, desc="The circle's radius."),
+        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.'),
+        strokeColor = AttrMapValue(isColorOrNone, desc='Color used for border line.'),
+        strokeWidth = AttrMapValue(isNumber, desc='Width used for lines.'),
+        cylinderMode = AttrMapValue(isBoolean, desc='True if shading reverses in middle.'),
+        )
+
+    def __init__(self,**kw):
+        self.cx = 0
+        self.cy = 0
+        self.radius = 100
+        self.numShades = 20
+        self.fillColorStart = colors.pink
+        self.fillColorEnd = colors.black
+        self.strokeColor = colors.black
+        self.strokeWidth = 2
+        self.cylinderMode = 0
+        self.setProperties(kw)
+
+    def demo(self):
+        D = Drawing(100, 100)
+        g = ShadedCircle()
+        D.add(g)
+
+        return D
+
+    def draw(self):
+        # general widget bits
+        group = Group()
+        c0, c1 = self.fillColorStart, self.fillColorEnd
+        numShades = self.numShades
+        if self.cylinderMode:
+            if not numShades%2: numShades = numShades+1
+            halfNumShades = (numShades-1)/2 + 1
+        num = float(numShades) # must make it float!
+        if numShades == 1:
+            V = [self.radius]
+        else:
+            V = frange(self.radius, 0, -self.radius/num)
+
+        for v in V:
+            circle = Circle(self.cx,self.cy,v)
+            if self.cylinderMode:
+                if V.index(v)>=halfNumShades:
+                    col = colors.linearlyInterpolatedColor(c1,c0,V[halfNumShades],V[-1], v)
+                else:
+                    col = colors.linearlyInterpolatedColor(c0,c1,V[0],V[halfNumShades], v)
+            else:
+                col = colors.linearlyInterpolatedColor(c0,c1,V[0],V[-1], v)
+            circle.fillColor = col
+            if v == self.radius:
+                circle.strokeColor = self.strokeColor
+                circle.strokeWidth = self.strokeWidth
+            else:
+                circle.strokeColor = None
+                circle.strokeWidth = 0
+            group.add(circle)
+
+        return group
+
+
 class ShadedRect(Widget):
     """This makes a rectangle with shaded colors between two colors.
 

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