gdkDrawLine
Draws a line, using the foreground color and other attributes of 
the GdkGC.
gdkDrawLine(object, gc, x1, y1, x2, y2)
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 a   | 
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 a   | 
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 the x coordinate of the start point.  | 
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 the y coordinate of the start point.  | 
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 the x coordinate of the end point.  | 
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 the y coordinate of the end point.  | 
Derived by RGtkGen from GTK+ documentation
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