133 lines
3.7 KiB
Python
133 lines
3.7 KiB
Python
#
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# BlobEdit - A totally silly application for showing
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# ======== off the GUI framework and providing an example
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# of its use.
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#
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# Blobs are red squares that you place on a Blob Document
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# by clicking and move around by dragging. You can save
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# your blob arrangement in a file and load it back later
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# to impress your friends (or send them away screaming).
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#
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# News flash: Got a blob you don't want? Now you can
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# get rid of it by shift-clicking it! Isn't that useful!
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#
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import pickle
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from GUI import Application, ScrollableView, Document, Window, Cursor, rgb
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from GUI.Files import FileType
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from GUI.Geometry import pt_in_rect, offset_rect, rects_intersect
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from GUI.StdColors import black, red
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class BlobApp(Application):
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def __init__(self):
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Application.__init__(self)
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self.blob_type = FileType(name = "Blob Document", suffix = "blob",
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#mac_creator = "BLBE", mac_type = "BLOB", # These are optional
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)
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self.file_type = self.blob_type
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self.blob_cursor = Cursor("blob.tiff")
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def open_app(self):
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self.new_cmd()
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def make_document(self, fileref):
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return BlobDoc(file_type = self.blob_type)
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def make_window(self, document):
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win = Window(size = (400, 400), document = document)
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view = BlobView(model = document, extent = (1000, 1000), scrolling = 'hv',
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cursor = self.blob_cursor)
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win.place(view, left = 0, top = 0, right = 0, bottom = 0, sticky = 'nsew')
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win.show()
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class BlobView(ScrollableView):
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def draw(self, canvas, update_rect):
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canvas.erase_rect(update_rect)
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canvas.fillcolor = red
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canvas.pencolor = black
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for blob in self.model.blobs:
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if blob.intersects(update_rect):
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blob.draw(canvas)
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def mouse_down(self, event):
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x, y = event.position
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blob = self.model.find_blob(x, y)
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if blob:
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if not event.shift:
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self.drag_blob(blob, x, y)
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else:
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self.model.delete_blob(blob)
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else:
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self.model.add_blob(Blob(x, y))
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def drag_blob(self, blob, x0, y0):
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for event in self.track_mouse():
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x, y = event.position
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self.model.move_blob(blob, x - x0, y - y0)
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x0 = x
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y0 = y
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def blob_changed(self, model, blob):
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self.invalidate_rect((0,0,self.extent[0],self.extent[1]))
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class BlobDoc(Document):
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blobs = None
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def new_contents(self):
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self.blobs = []
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def read_contents(self, file):
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self.blobs = pickle.load(file)
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def write_contents(self, file):
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pickle.dump(self.blobs, file)
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def add_blob(self, blob):
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self.blobs.append(blob)
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self.changed()
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self.notify_views('blob_changed', blob)
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def find_blob(self, x, y):
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for blob in self.blobs:
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if blob.contains(x, y):
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return blob
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return None
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def move_blob(self, blob, dx, dy):
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self.notify_views('blob_changed', blob)
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blob.move(dx, dy)
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self.changed()
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self.notify_views('blob_changed', blob)
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def delete_blob(self, blob):
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self.notify_views('blob_changed', blob)
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self.blobs.remove(blob)
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self.changed()
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class Blob:
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def __init__(self, x, y):
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self.rect = (x - 20, y - 20, x + 20, y + 20)
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def contains(self, x, y):
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return pt_in_rect((x, y), self.rect)
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def intersects(self, rect):
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return rects_intersect(rect, self.rect)
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def move(self, dx, dy):
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self.rect = offset_rect(self.rect, (dx, dy))
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def draw(self, canvas):
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canvas.fill_frame_rect(self.rect)
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BlobApp().run()
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