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https://github.com/Apress/foundations-of-pygtk-development.git
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122 lines
3.4 KiB
Python
122 lines
3.4 KiB
Python
#!/usr/bin/python3
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import sys
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import cairo
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import gi
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gi.require_version('Gtk', '3.0')
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from gi.repository import Gtk, Gdk
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SIZE = 30
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class AppWindow(Gtk.ApplicationWindow):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, **kwargs)
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self.set_size_request(450, 550)
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drawingarea = Gtk.DrawingArea()
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self.add(drawingarea)
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drawingarea.connect('draw', self.draw)
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def triangle(self, ctx):
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ctx.move_to(SIZE, 0)
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ctx.rel_line_to(SIZE, 2 * SIZE)
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ctx.rel_line_to(-2 * SIZE, 0)
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ctx.close_path()
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def square(self, ctx):
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ctx.move_to(0, 0)
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ctx.rel_line_to(2 * SIZE, 0)
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ctx.rel_line_to(0, 2 * SIZE)
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ctx.rel_line_to(-2 * SIZE, 0)
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ctx.close_path()
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def bowtie(self, ctx):
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ctx.move_to(0, 0)
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ctx.rel_line_to(2 * SIZE, 2 * SIZE)
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ctx.rel_line_to(-2 * SIZE, 0)
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ctx.rel_line_to(2 * SIZE, -2 * SIZE)
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ctx.close_path()
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def inf(self, ctx):
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ctx.move_to(0, SIZE)
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ctx.rel_curve_to(0, SIZE, SIZE, SIZE, 2 * SIZE, 0)
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ctx.rel_curve_to(SIZE, -SIZE, 2 * SIZE, -SIZE, 2 * SIZE, 0)
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ctx.rel_curve_to(0, SIZE, -SIZE, SIZE, -2 * SIZE, 0)
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ctx.rel_curve_to(-SIZE, -SIZE, -2 * SIZE, -SIZE, -2 * SIZE, 0)
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ctx.close_path()
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def draw_shapes(self, ctx, x, y, fill):
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ctx.save()
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ctx.new_path()
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ctx.translate(x + SIZE, y + SIZE)
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self.bowtie(ctx)
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if fill:
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ctx.fill()
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else:
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ctx.stroke()
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ctx.new_path()
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ctx.translate(3 * SIZE, 0)
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self.square(ctx)
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if fill:
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ctx.fill()
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else:
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ctx.stroke()
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ctx.new_path()
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ctx.translate(3 * SIZE, 0)
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self.triangle(ctx)
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if fill:
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ctx.fill()
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else:
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ctx.stroke()
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ctx.new_path()
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ctx.translate(3 * SIZE, 0)
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self.inf(ctx)
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if fill:
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ctx.fill()
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else:
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ctx.stroke()
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ctx.restore()
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def fill_shapes(self, ctx, x, y):
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self.draw_shapes(ctx, x, y, True)
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def stroke_shapes(self, ctx, x, y):
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self.draw_shapes(ctx, x, y, False)
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def draw(self, da, ctx):
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ctx.set_source_rgb(0, 0, 0)
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ctx.set_line_width(SIZE / 4)
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ctx.set_tolerance(0.1)
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ctx.set_line_join(cairo.LINE_JOIN_ROUND)
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ctx.set_dash([SIZE / 4.0, SIZE / 4.0], 0)
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self.stroke_shapes(ctx, 0, 0)
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ctx.set_dash([], 0)
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self.stroke_shapes(ctx, 0, 3 * SIZE)
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ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
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self.stroke_shapes(ctx, 0, 6 * SIZE)
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ctx.set_line_join(cairo.LINE_JOIN_MITER)
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self.stroke_shapes(ctx, 0, 9 * SIZE)
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self.fill_shapes(ctx, 0, 12 * SIZE)
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ctx.set_line_join(cairo.LINE_JOIN_BEVEL)
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self.fill_shapes(ctx, 0, 15 * SIZE)
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ctx.set_source_rgb(1, 0, 0)
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self.stroke_shapes(ctx, 0, 15 * SIZE)
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class Application(Gtk.Application):
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def __init__(self, *args, **kwargs):
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super().__init__(*args, application_id="org.example.myapp",
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**kwargs)
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self.window = None
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def do_activate(self):
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if not self.window:
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self.window = AppWindow(application=self,
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title="Drawing Areas")
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self.window.show_all()
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self.window.present()
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if __name__ == "__main__":
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app = Application()
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app.run(sys.argv)
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