creating new project for Ruler

1 files changed, 118 insertions, 0 deletions

diff --git a/show_angles.py b/show_angles.py
new file mode 100644
index 0000000..07c685f
--- /dev/null
+++ b/show_angles.py
@@ -0,0 +1,118 @@
+# Copyright 2007 Mitchell N. Charity
+#
+# This file is part of Ruler.
+#
+# Ruler is free software: you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# Ruler is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with Ruler.  If not, see <http://www.gnu.org/licenses/>
+
+from __future__ import division
+import paper
+import cairo
+from util import mm
+from math import pi,sin,cos
+
+from colorsys import * #XXX
+
+def d2r(d):
+    return d/180*pi
+
+def subactivity_init(api):
+    api.declare_subactivity('angles-360', Angles360())
+    api.declare_subactivity('angles-90', Angles90())
+    #api.declare_subactivity('angles-180', Angles90())
+
+class Angles90(paper.Drawing):
+    def draw(self,c):
+        self.set_background_color('white')
+
+        c.set_antialias(True)
+
+        ox = mm(0)
+        oy = mm(99)
+        d = mm(90)
+        def xy(angle,m=d):
+            return cos(-angle)*m+ox,sin(-angle)*m+oy
+        def ray(angle,r0=0,r1=d):
+            c.move_to(*xy(angle,r0))
+            c.line_to(*xy(angle,r1))
+
+        lw = 6
+        c.set_line_width(lw)
+        c.move_to(ox,oy+lw/2)
+        c.line_to(*xy(pi/2))
+        ray(0)
+        c.stroke()
+
+        c.save()
+        c.set_line_width(3)
+        c.set_dash([mm(5)])
+        ray(pi/4)
+        c.stroke()
+        c.restore()
+
+        c.set_line_width(4)
+        for a in range(10,81,10):
+            ray(d2r(a),mm(10),mm(85))
+        c.stroke()
+        c.set_line_width(2)
+        for a in range(10,81,10):
+            ray(d2r(a),mm(3),mm(20))
+        c.stroke()
+
+        c.set_line_width(2)
+        for a in range(1,90,1):
+            ray(d2r(a),mm(70),mm(80))
+        c.stroke()
+        c.set_line_width(2)
+        for a in range(0,90,5):
+            ray(d2r(a),mm(20),mm(81))
+        c.stroke()
+
+class Angles360(paper.Drawing):
+    def draw(self,c):
+        self.set_background_color('white')
+        c.set_antialias(True)
+
+        ox = mm(75)
+        oy = mm(50)
+        d = mm(44)
+        def xy(angle,m=d):
+            return cos(-angle)*m+ox,sin(-angle)*m+oy
+        def ray(angle,r0=0,r1=d):
+            c.move_to(*xy(angle,r0))
+            c.line_to(*xy(angle,r1))
+        def annulus(a0,a1,r0,r1):
+            c.move_to(*xy(a0,r0))
+            c.arc_to(ox,oy,r0,a0,a1)
+            c.rel_line_to(*xy(a1,r1))
+            c.arc_to(ox,oy,r1,a1,a0)
+            c.close_path()
+
+        def rays(step,r0=0,r1=d,w=1):
+            c.save()
+            c.set_line_width(w)
+            for a in range(0,360,step):
+                ray(d2r(a),r0,r1)
+            c.stroke()
+            c.restore()
+
+        rays(1,mm(35),w=2,r1=mm(43))
+        rays(5,mm(10),w=2)
+        rays(10,mm(10),w=4)
+#        rays(10,mm(3),mm(20),w=2)
+        c.save()
+        #c.set_dash([mm(5)])
+        self.set_color('dark gray')
+        rays(45,0,mm(45),w=6)
+        c.restore()
+        rays(90,0,mm(45),w=6)