54 lines
1.8 KiB
Python
54 lines
1.8 KiB
Python
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import PySimpleGUI as sg
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"""
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Demo - Drag a rectangle to draw it
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This demo shows how to use a Graph Element to (optionally) display an image and then use the
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mouse to "drag a rectangle". This is sometimes called a rubber band and is an operation you
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see in things like editors
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"""
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# image_file = r'Color-names.png'
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image_file = None # image is optional
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layout = [[sg.Graph(
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canvas_size=(400, 400),
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graph_bottom_left=(0, 400),
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graph_top_right=(400, 0),
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key="-GRAPH-",
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change_submits=True, # mouse click events
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drag_submits=True),],
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[sg.Text("", key="info", size=(60, 1))]]
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window = sg.Window("draw rect on image", layout, finalize=True)
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# get the graph element for ease of use later
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graph = window["-GRAPH-"] # type: sg.Graph
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graph.DrawImage(image_file, location=(0,0)) if image_file else None
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dragging = False
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start_point = end_point = prior_rect = None
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while True:
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event, values = window.Read()
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if event is None:
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break # exit
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if event == "-GRAPH-": # if there's a "Graph" event, then it's a mouse
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x, y = values["-GRAPH-"]
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if not dragging:
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start_point = (x, y)
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dragging = True
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else:
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end_point = (x, y)
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if prior_rect:
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graph.DeleteFigure(prior_rect)
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if None not in (start_point, end_point):
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prior_rect = graph.DrawRectangle(start_point, end_point, line_color='red')
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elif event.endswith('+UP'): # The drawing has ended because mouse up
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info = window.Element("info")
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info.Update(value=f"grabbed rectangle from {start_point} to {end_point}")
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start_point, end_point = None, None # enable grabbing a new rect
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dragging = False
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else:
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print("unhandled event", event, values)
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