moooooon

moon.py

@@ -0,0 +1,57 @@
+#!/usr/bin/env python3
+
+import cairo
+import math
+import random
+from utils import circle_fill
+from utils import draw_crater
+from utils import random_color
+
+WIDTH, HEIGHT = 1000, 1000
+
+def main():
+    
+    surface = cairo.ImageSurface(cairo.FORMAT_ARGB32, WIDTH, HEIGHT)
+    ctx = cairo.Context(surface)
+
+    ctx.scale(WIDTH, HEIGHT)  # Normalizing the canvas
+    ctx.set_source_rgb(0.9, 0.9, 0.9)
+    # draw "full" moon
+    circle_fill(ctx, 0.5, 0.5, 0.5)
+    
+    # make sure we only draw "inside" 
+    ctx.set_operator(cairo.Operator.ATOP)
+    
+
+
+    # draw craters
+    ctx.set_source_rgb(0.5, 0.5, 0.5)
+    for c in range(30):
+        #c_col = random.uniform(0.4, 0.6)
+        #ctx.set_source_rgb(c_col, c_col, c_col)
+        c_x = random.uniform(0.0, 1.0)
+        c_y = random.uniform(0.0, 1.0)
+        c_r = random.uniform(0.01, 0.1)
+        draw_crater(ctx, c_x, c_y, c_r)
+
+    # draw "aura"
+    a_r, a_g, a_b = random_color()
+    p = cairo.RadialGradient(0.5, 0.5, 0.25, 0.5, 0.5, 0.5)
+    #p.add_color_stop_rgba(0.0, 0.9, 0.9, 0.9, 0.0)
+    p.add_color_stop_rgba(0.0, a_r, a_g, a_b, 0.0)
+    p.add_color_stop_rgba(0.3, a_r, a_g, a_b, 0.0)
+    p.add_color_stop_rgba(1.0, a_r, a_g, a_b, 0.8)
+    ctx.set_source(p)
+    ctx.arc(0.5, 0.5, 0.5, 0, math.pi*2)
+    #ctx.arc(0.5, 0.5, 0.3, 0, math.pi*2)
+    ctx.fill()
+
+    # draw "shade" of the phase
+    ctx.set_source_rgba(0.1, 0.1, 0.1, 0.95)
+    phase_pos = random.uniform(-0.5, 1.5)
+    circle_fill(ctx, phase_pos, 0.5, 0.5)
+
+    surface.write_to_png("out/moon.png")  # Output to PNG
+
+if __name__ == '__main__':
+    main()

utils.py

@@ -10,6 +10,14 @@ def circle_fill(ctx,x,y,r):
     ctx.arc(x,y,r,0,math.pi*2.)
     ctx.fill()
 
+def draw_crater(ctx,x,y,r):
+    for n in range(3):
+        off_x = random.uniform(-0.01, 0.01)
+        off_y = random.uniform(-0.01, 0.01)
+        ctx.arc(x + off_x, y + off_y, r, 0, math.pi*2.)
+        ctx.fill()
+
+
 
 def random_color():
     red = random.uniform(0, 1)