1 files changed, 71 insertions, 0 deletions
diff --git a/lib/elements/svg_objects.py b/lib/elements/svg_objects.py
new file mode 100644
index 00000000..e597f7c1
--- /dev/null
+++ b/lib/elements/svg_objects.py
@@ -0,0 +1,71 @@
+def rect_to_path(node):
+    x = float(node.get('x', '0'))
+    y = float(node.get('y', '0'))
+    width = float(node.get('width', '0'))
+    height = float(node.get('height', '0'))
+    rx = None
+    ry = None
+
+    # rounded corners
+    # the following rules apply for radius calculations:
+    #   if rx or ry is missing it has to take the value of the other one
+    #   the radius cannot be bigger than half of the corresponding side
+    #   (otherwise we receive an invalid path)
+    if node.get('rx') or node.get('ry'):
+        if node.get('rx'):
+            rx = float(node.get('rx', '0'))
+            ry = rx
+        if node.get('ry'):
+            ry = float(node.get('ry', '0'))
+            if not ry:
+                ry = rx
+
+        rx = min(width/2, rx)
+        ry = min(height/2, ry)
+
+        path = 'M %(startx)f,%(y)f ' \
+               'h %(width)f ' \
+               'q %(rx)f,0 %(rx)f,%(ry)f ' \
+               'v %(height)f ' \
+               'q 0,%(ry)f -%(rx)f,%(ry)f ' \
+               'h -%(width)f ' \
+               'q -%(rx)f,0 -%(rx)f,-%(ry)f ' \
+               'v -%(height)f ' \
+               'q 0,-%(ry)f %(rx)f,-%(ry)f ' \
+               'Z' \
+               % dict(startx=x+rx, x=x, y=y, width=width-(2*rx), height=height-(2*ry), rx=rx, ry=ry)
+
+    else:
+        path = "M %f,%f H %f V %f H %f Z" % (x, y, width+x, height+y, x)
+
+    return path
+
+
+def ellipse_to_path(node):
+    rx = float(node.get('rx', "0")) or float(node.get('r', "0"))
+    ry = float(node.get('ry', "0")) or float(node.get('r', "0"))
+    cx = float(node.get('cx'))
+    cy = float(node.get('cy'))
+
+    path = 'M %(cx_r)f,%(cy)f' \
+           'C %(cx_r)f,%(cy_r)f %(cx)f,%(cy_r)f %(cx)f,%(cy_r)f ' \
+           '%(cxr)f,%(cy_r)f %(cxr)f,%(cy)f %(cxr)f,%(cy)f ' \
+           '%(cxr)f,%(cyr)f %(cx)f,%(cyr)f %(cx)f,%(cyr)f ' \
+           '%(cx_r)f,%(cyr)f %(cx_r)f,%(cy)f %(cx_r)f,%(cy)f ' \
+           'Z' \
+           % dict(cx=cx, cx_r=cx-rx, cxr=cx+rx, cy=cy, cyr=cy+ry, cy_r=cy-ry)
+
+    return path
+
+
+def circle_to_path(node):
+    cx = float(node.get('cx'))
+    cy = float(node.get('cy'))
+    r = float(node.get('r'))
+
+    path = 'M %(xstart)f, %(cy)f ' \
+           'a %(r)f,%(r)f 0 1,0 %(rr)f,0 ' \
+           'a %(r)f,%(r)f 0 1,0 -%(rr)f,0 ' \
+           % dict(xstart=(cx-r), cy=cy, r=r, rr=(r*2))
+
+    return path