Added printing requirements

reportlab/pdfgen/pdfgeom.py

@@ -0,0 +1,77 @@
+#Copyright ReportLab Europe Ltd. 2000-2012
+#see license.txt for license details
+#history http://www.reportlab.co.uk/cgi-bin/viewcvs.cgi/public/reportlab/trunk/reportlab/pdfgen/pdfgeom.py
+__version__=''' $Id$ '''
+__doc__="""
+This module includes any mathematical methods needed for PIDDLE.
+It should have no dependencies beyond the Python library.
+
+So far, just Robert Kern's bezierArc.
+"""
+
+from math import sin, cos, pi, ceil
+
+
+def bezierArc(x1,y1, x2,y2, startAng=0, extent=90):
+    """bezierArc(x1,y1, x2,y2, startAng=0, extent=90) --> List of Bezier
+curve control points.
+
+(x1, y1) and (x2, y2) are the corners of the enclosing rectangle.  The
+coordinate system has coordinates that increase to the right and down.
+Angles, measured in degress, start with 0 to the right (the positive X
+axis) and increase counter-clockwise.  The arc extends from startAng
+to startAng+extent.  I.e. startAng=0 and extent=180 yields an openside-down
+semi-circle.
+
+The resulting coordinates are of the form (x1,y1, x2,y2, x3,y3, x4,y4)
+such that the curve goes from (x1, y1) to (x4, y4) with (x2, y2) and
+(x3, y3) as their respective Bezier control points."""
+
+    x1,y1, x2,y2 = min(x1,x2), max(y1,y2), max(x1,x2), min(y1,y2)
+
+    if abs(extent) <= 90:
+        arcList = [startAng]
+        fragAngle = float(extent)
+        Nfrag = 1
+    else:
+        arcList = []
+        Nfrag = int(ceil(abs(extent)/90.))
+        fragAngle = float(extent) / Nfrag
+
+    x_cen = (x1+x2)/2.
+    y_cen = (y1+y2)/2.
+    rx = (x2-x1)/2.
+    ry = (y2-y1)/2.
+    halfAng = fragAngle * pi / 360.
+    kappa = abs(4. / 3. * (1. - cos(halfAng)) / sin(halfAng))
+
+    if fragAngle < 0:
+        sign = -1
+    else:
+        sign = 1
+
+    pointList = []
+
+    for i in range(Nfrag):
+        theta0 = (startAng + i*fragAngle) * pi / 180.
+        theta1 = (startAng + (i+1)*fragAngle) *pi / 180.
+        if fragAngle > 0:
+            pointList.append((x_cen + rx * cos(theta0),
+                              y_cen - ry * sin(theta0),
+                              x_cen + rx * (cos(theta0) - kappa * sin(theta0)),
+                              y_cen - ry * (sin(theta0) + kappa * cos(theta0)),
+                              x_cen + rx * (cos(theta1) + kappa * sin(theta1)),
+                              y_cen - ry * (sin(theta1) - kappa * cos(theta1)),
+                              x_cen + rx * cos(theta1),
+                              y_cen - ry * sin(theta1)))
+        else:
+            pointList.append((x_cen + rx * cos(theta0),
+                              y_cen - ry * sin(theta0),
+                              x_cen + rx * (cos(theta0) + kappa * sin(theta0)),
+                              y_cen - ry * (sin(theta0) - kappa * cos(theta0)),
+                              x_cen + rx * (cos(theta1) - kappa * sin(theta1)),
+                              y_cen - ry * (sin(theta1) + kappa * cos(theta1)),
+                              x_cen + rx * cos(theta1),
+                              y_cen - ry * sin(theta1)))
+
+    return pointList