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barisdinc · 21. Februar 2022

I am developing a plugin to show the Satellite spectrum view (see attached picture)

My plugin is inheriting from Screen class.... I have a render="Canvas" on my skin and I am drawing on that canvas using the fill(), writetext() and line() methods....
But I am not able to find how I can clear the canvas? I found a workaround that I draw a full black rectangle over my drawing which erases everything on canvas. But I didn't like this solution because I cannot make it transparent.

please check https://github.com/barisdinc/q…aw/main/qo100_plugin.jpeg

Can you tell me how I can just erase the canvas.

Thanks

Baris DINC

OH2UDS/TA7W

[Blockierte Grafik: https://github.com/barisdinc/qo100_wb_transponder_plugin/raw/main/qo100_plugin.jpeg]

alpha · 21. Februar 2022

nice work.

i have no idea, but google showed me this:

enigma2: Components.Sources.CanvasSource.CanvasSource Class Reference

there is a clear function... but i don't know whether this is what you are looking for.

barisdinc · 21. Februar 2022

Thanks... I checked the source code for that and I already found that (which clears the list of drawn objects)

But it does not clear the screen... Even I tried "FLUSH"ing after clearing I may be doing something wrong..

Python

class CanvasSource(Source):
    def __init__(self):
        Source.__init__(self)
        self.sequence = 0
        self.clear()

    def clear(self):
        self.sequence += 1
        self._drawlist = (self.sequence, [])

    def get_drawlist(self):  # TODO: getDrawList
        return self._drawlist

    drawlist = property(get_drawlist)  # TODO: drawList

    def fill(self, x, y, width, height, color):
        self.drawlist[1].append((1, x, y, width, height, color))

    def writeText(self, x, y, width, height, fg, bg, font, text, flags=0):
        self.drawlist[1].append((2, x, y, width, height, fg, bg, font, text, flags))

    def line(self, x0, y0, x1, y1, color):
        self.drawlist[1].append((3, x0, y0, x1, y1, color))

    def rline(self, ox, oy, x0, y0, x1, y1, angle, clockwise, color):
        self.drawlist[1].append((4, ox, oy, x0, y0, x1, y1, angle, clockwise, color))

    def flush(self):
        self.changed((self.CHANGED_DEFAULT,))

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