Cairo example

1 files changed, 79 insertions, 0 deletions

diff --git a/examples/cairo_zoom_rotate.py b/examples/cairo_zoom_rotate.py
new file mode 100644
index 0000000..ea3940d
--- /dev/null
+++ b/examples/cairo_zoom_rotate.py
@@ -0,0 +1,79 @@
+#!/usr/bin/env python
+
+import cairo
+import math
+
+from gi.repository import Gtk
+
+R_WIDTH = 150
+R_HEIGHT = 100
+
+S_WIDTH = 300
+S_HEIGHT = 250
+
+SCALE = 1.5
+
+
+class TestCairo(Gtk.DrawingArea):
+
+    def __init__(self):
+        super(TestCairo, self).__init__()
+
+        self.surface = None
+
+        self.connect('draw', self.__draw_cb)
+
+    def __draw_cb(self, widget, ctx):
+        print '__draw_cb'
+
+        if self.surface is None:
+            self.surface = ctx.get_target().create_similar(
+                cairo.CONTENT_COLOR_ALPHA, S_WIDTH, S_HEIGHT)
+            ctx_surface = cairo.Context(self.surface)
+            ctx_surface.set_source_rgba(1, 0, 0, 0.7)
+            ctx_surface.rectangle(0, 0, R_WIDTH, R_HEIGHT)
+            ctx_surface.fill()
+
+            ctx_surface.set_source_rgb(0, 0, 0)
+            ctx_surface.rectangle(0, 0, R_WIDTH, R_HEIGHT)
+            ctx_surface.stroke()
+            ctx_surface.set_line_width(5)
+            ctx_surface.rectangle(0, 0, S_WIDTH, S_HEIGHT)
+            ctx_surface.stroke()
+
+        # ROTATE 90
+        ctx.rotate(math.pi / 2)
+        ctx.translate(0, -R_HEIGHT * SCALE)
+
+        # ROTATE 180
+        # ctx.rotate(math.pi)
+        # ctx.translate(-R_WIDTH * SCALE, -R_HEIGHT * SCALE)
+
+        # ROTATE 270
+        # ctx.rotate(math.pi * 3 / 2)
+        # ctx.translate(-R_WIDTH * SCALE, 0)
+
+        # a little cirle at (10, 10)
+        ctx.set_source_rgba(0.3, 0.3, 0.3, 0.7)
+        ctx.arc(10, 10, 10, 0., 2 * math.pi)
+        ctx.fill()
+
+        ctx.scale(SCALE, SCALE)
+
+        ctx.set_source_surface(self.surface, 0, 0)
+        ctx.paint()
+
+
+def main():
+    window = Gtk.Window()
+    test_cairo = TestCairo()
+
+    window.add(test_cairo)
+    window.connect("destroy", Gtk.main_quit)
+    window.show_all()
+    window.set_size_request(S_WIDTH, S_HEIGHT)
+    # window.maximize()
+    Gtk.main()
+
+if __name__ == "__main__":
+    main()