Changeset 1552

Timestamp:

07/02/07 11:44:46 (1 year ago)

Author:

wrobe..@pld-linux.org

Message:

- added another custom item example - a circle

Files:

• gaphas/branches/hw/demo.py (modified) (2 diffs)
• gaphas/branches/hw/gaphas/examples.py (modified) (2 diffs)

gaphas/branches/hw/demo.py

@@ -25 +25 @@
-import cairo
-from gaphas import Canvas, GtkView, View
-
+Circle, 
-from gaphas.item import Line, NW, SE
-from gaphas.tool import PlacementTool, HandleTool
@@ -310 +310 @@
-    h1.y = 50
-    fl.matrix.translate(50, 50)
+    fl.height = 50
-    c.add(fl)
-
-
+
+
+
+
+
+
+
+
+
+
+
-
-#   bb=Box()

gaphas/branches/hw/gaphas/examples.py

@@ -13 +13 @@
-from constraint import BalanceConstraint, LessThanConstraint, EqualsConstraint
-from geometry import point_on_rectangle, distance_rectangle_point
-
+, path_ellipse
-
-class Box(Element):
@@ -117 +117 @@
-        cr.move_to(0, 0)
-        cr.line_to(0, self.height)
+        cr.stroke()
+
+
+
+class Circle(Item):
+    def __init__(self):
+        super(Circle, self).__init__()
+        self._handles.extend((Handle(), Handle()))
+
+
+    def _set_radius(self, height):
+        h1, h2 = self._handles
+        return h1.y + height
+
+
+    def _get_radius(self):
+        h1, h2 = self._handles
+        return ((h2.x - h1.x) ** 2 + (h2.y - h1.y) ** 2) ** 0.5
+
+
+    radius = property(_get_radius, _set_radius)
+
+
+    def _get_pos(self):
+        h1, h2 = self._handles
+        x, y = h2.x - h1.x, h2.y - h1.y
+        if x > 0:
+            x = 0
+        if y > 0:
+            y = 0
+        return abs(x), abs(y)
+
+
+    pos = property(_get_pos)
+
+
+    def setup_canvas(self):
+        super(Circle, self).setup_canvas()
+        h1, h2 = self._handles
+        h1.movable = False
+
+
+    def draw(self, context):
+        cr = context.cairo
+        x, y = self.pos
+        path_ellipse(cr, x, y, 2 * self.radius, 2 * self.radius)
-        cr.stroke()
-