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do lineto and pixel drawing operations only work within canvas actors?
cant i just create a normal actor and let him draw a line??

i tried this within a normal actor:

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(Draw Actor:)

moveto(xscreen,yscreen); // or just x, y??
setpen(255,255,255,0,2);
lineto(0,128);


Shouldn´t this draw a line from the actor position down 128 pixels?
I cant see any line

You can only use canvas actors.
The coordinates are relative to the actor, so, if you need to draw something in screen coordinate, like the mouse position, use the screen_to_actor function:

Draw a vertical white line:

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setpen(255,255,255,0,2);
moveto(0, 0); //Left up corner
lineto(0,128);

Draw a white point at mouse coordinates:

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setpen(255,255,255,0,2);
screen_to_actor(&xmouse,&ymouse); //get mouse coordinates
moveto(xmouse,ymouse); //move pen to mouse coordinates
lineto(xmouse, ymouse);

and again : thank you very much!