initial draft

OnScreen.py

@@ -0,0 +1,62 @@
+#!/usr/bin/python
+
+'''
+ZetCode PyCairo tutorial 
+
+This code example draws a circle
+using the PyCairo library.
+
+Author: Jan Bodnar
+Website: zetcode.com 
+Last edited: April 2016
+'''
+
+from gi.repository import Gtk
+import cairo
+import math
+
+
+class Example(Gtk.Window):
+
+    def __init__(self):
+        super(Example, self).__init__()
+        
+        self.init_ui()
+        
+        
+    def init_ui(self):    
+
+        darea = Gtk.DrawingArea()
+        darea.connect("draw", self.on_draw)
+        self.add(darea)
+
+        self.set_title("Fill & stroke")
+        self.resize(230, 150)
+        self.set_position(Gtk.WindowPosition.CENTER)
+        self.connect("delete-event", Gtk.main_quit)
+        self.show_all()
+        
+    
+    def on_draw(self, wid, cr):
+
+        cr.set_line_width(9)
+        cr.set_source_rgb(0.7, 0.2, 0.0)
+        
+        w, h = self.get_size()      
+
+        cr.translate(w/2, h/2)
+        cr.arc(0, 0, 50, 0, 2*math.pi)
+        cr.stroke_preserve()
+     
+        cr.set_source_rgb(0.3, 0.4, 0.6)
+        cr.fill()
+        
+    
+def main():
+    
+    app = Example()
+    Gtk.main()
+        
+        
+if __name__ == "__main__":    
+    main()

divergenza.py

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+#!/usr/bin/python
+
+'''
+Schotter pdf reproduction
+
+It design SchotterR 
+Author: Jan Bodnar
+Website: zetcode.com 
+Last edited: April 2016
+'''
+
+import math,cairo,random
+
+def plotSquares(ctx):
+    global rsum
+    for i in xrange(1,w):
+	
+	rsum += i*rs # add to the random value
+	
+        ctx.translate(s*i, 0)
+	for j in xrange(1,h):
+		
+		rv = random.uniform(-rsum, rsum)
+		# here comes the box :-)
+		#box = shapes.square(s)
+		
+		# box position
+		#curr_cx = - w*s/2 + i*s + rv*dp ;	curr_cy = - h*s/2 + j*s + rv*dp
+		#   transforms.center_at(box, [curr_cx, curr_cy])
+		#
+		#  # rotate the box of rv degrees around its center
+		#  transforms.rotate(box, rv, pivot=(curr_cx, curr_cy))
+                #
+		# draw the damn box	
+		#  plotter.write(box)
+                #
+                ctx.translate(0, s*j)
+                #ctx.rotate(math.pi * 1 / 4)
+                ctx.rotate(rv)
+                ctx.rectangle(0,0, s, s)
+                ctx.stroke()
+
+
+
+#float RGB touple
+FG_RGB_COLOR=(0,0,0)
+#A4 in 300 DPI
+width, height = 3508,2480
+w = 1 # width (how many squares - es. 22)
+h = 12 # height (how many squares - es. 12)
+s = 100 # square size  (es. 15)
+
+rs = 0.015 # random step (rotation increment in degrees)
+dp = 2.25 # dampen (soften random effect for position)
+rsum = 0 # dummy initial value for rsum
+
+
+
+
+surface = cairo.PDFSurface ("/tmp/circle.pdf",width,height)
+ctx = cairo.Context (surface)
+
+ctx.set_source_rgb(FG_RGB_COLOR[0],FG_RGB_COLOR[1],FG_RGB_COLOR[2])
+ctx.set_line_width(1)
+ctx.translate(100, 500)
+plotSquares(ctx)
+
+
+
+
+ctx.show_page()
+
+
+
+