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How can I: put pixel, define it's colour, draw line and determine line's colour ?

There is no way to check a pixels color, there is a getpixel example on the forums, but you can't do this without creating an array. To put a pixel, you use the function putpixel.

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putpixel(x,y);

To draw a line, use lineto. It will draw a line from the current position (the pen) to the specified (x,y).

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lineto(x,y);

To move where the pen of the actor is, use moveto.

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moveto(x,y);

To set the color of the pixel, or the line, use setpen.

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setpen(r,g,b,transparency,size);

Your advices were very usefull. I've managed to create the game with a line. Thanks to you, the game is completed http://game-editor.com/forum/viewtopic.php?f=6&t=9437