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"""
This demo is a canvas that showcases some of the drawing primitives in Enable.
"""
from enable.example_support import DemoFrame, demo_main
from enable.api import Window
from enable.drawing.api import DragLine, DragPolygon, DragSegment, \
DrawingTool, PointLine, PointPolygon, DrawingCanvas, ToolbarButton, \
DrawingCanvasToolbar
from traits.api import Instance
class ResetButton(ToolbarButton):
def perform(self, event):
if self.canvas and self.canvas.active_tool:
self.canvas.active_tool.reset()
self.canvas.request_redraw()
return
class ActivateButton(ToolbarButton):
tool = Instance(DrawingTool)
def perform(self, event):
if not self.canvas or not self.tool:
return
else:
self.canvas.activate(self.tool)
self.canvas.request_redraw()
return
def _tool_changed(self, old, new):
if new:
new.reset()
return
class MyFrame(DemoFrame):
def _create_window(self):
canvas = DrawingCanvas(bounds=[500,500])
toolbar = DrawingCanvasToolbar(width=500, height=32, fit_window=False,
bgcolor="lightgrey")
canvas.toolbar = toolbar
toolbar.canvas = canvas
button1 = ResetButton(label="Reset", toolbar=toolbar, bounds=[50,24])
button2 = ActivateButton(tool=DragLine(container=canvas), label="Path",
toolbar=toolbar, bounds=[50,24])
button3 = ActivateButton(tool=DragPolygon(background_color=(0,0,0.8,1),
container=canvas),
label="Poly", toolbar=toolbar, bounds=[50,24])
button4 = ActivateButton(tool=PointLine(container=canvas),
label="Polyline",
toolbar=toolbar, bounds=[70,24])
button5 = ActivateButton(tool=DragSegment(container=canvas),
label="Line", toolbar=toolbar, bounds=[50,24])
button6 = ActivateButton(tool=PointPolygon(container=canvas),
label="PointPoly", toolbar=toolbar,
bounds=[80,24])
toolbar.add_button(button1)
toolbar.add_button(button2)
toolbar.add_button(button3)
toolbar.add_button(button4)
toolbar.add_button(button5)
toolbar.add_button(button6)
return Window(self, -1, component=canvas)
if __name__ == "__main__":
# Save demo so that it doesn't get garbage collected when run within
# existing event loop (i.e. from ipython).
demo = demo_main(MyFrame, size=[700,600])
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