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"""
Demonstrates how clipping of objects occurs with the view_bounds parameter to draw().
"""
from enable.example_support import DemoFrame, demo_main
from enable.api import Container, Component, Scrolled, Window
from enable.base import empty_rectangle, intersect_bounds
class Box(Component):
def _draw_mainlayer(self, gc, view_bounds=None, mode="default"):
with gc:
gc.set_fill_color((1.0, 0.0, 0.0, 1.0))
dx, dy = self.bounds
x, y = self.position
gc.rect(x, y, dx, dy)
gc.fill_path()
return
class VerboseContainer(Container):
"""
By default a container just doesn't draw contained components if they are
outside its view_bounds. This subclass modifies the behavior to report
what components are not being drawn and what their bounds are.
"""
fit_window = False
def _draw_container_mainlayer(self, gc, view_bounds, mode="default"):
with gc:
gc.set_fill_color((1.0, 1.0, 1.0, 1.0))
gc.set_stroke_color((1.0, 1.0, 1.0, 1.0))
gc.rect(self.x, self.y, self.width, self.height)
gc.fill_path()
if view_bounds:
v = view_bounds
new_bounds = (v[0]-self.x, v[1]-self.y, v[2], v[3])
else:
new_bounds = None
with gc:
gc.translate_ctm(*self.position)
gc.set_stroke_color((0.0, 0.0, 0.0, 1.0))
for component in self._components:
# See if the component is visible:
tmp = intersect_bounds(component.position + component.bounds,
new_bounds)
if tmp == empty_rectangle:
print "skipping component:", component.__class__.__name__,
print "\tbounds:", component.position, component.bounds
continue
with gc:
component.draw(gc, new_bounds, mode)
class MyFrame(DemoFrame):
def _create_window(self):
container = VerboseContainer(auto_size=False, bounds = [800,800])
a = Box(bounds=[50.0,50.0], position=[50.0,50.0])
b = Box(bounds=[50.0,50.0], position=[200.0,50.0])
c = Box(bounds=[50.0,50.0], position=[50.0,200.0])
d = Box(bounds=[50.0,50.0], position=[200.0,200.0])
container.add(a)
container.add(b)
container.add(c)
container.add(d)
scr = Scrolled(container, bounds=[300,300], position=[50,50],
fit_window=False)
return Window(self, -1, component=scr)
if __name__ == "__main__":
title = "Use the scroll bars to show and hide components"
# Save demo so that it doesn't get garbage collected when run within
# existing event loop (i.e. from ipython).
demo = demo_main(MyFrame, title=title)
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