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lineto(0,0);

a function used to draw lines in a canvas from one point to another... helpful in many ways including images.
heres how it works::

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setpen(255,200,250,0,1);

this turns the canvas into.. a canvas of art
255:red
200:green
250:blue
0:transparency
1:line thickness

moveto(0,0);
moves the starting point of your shape/line to this point.
(bare in mind the points are now relevant to the canvas, 0,0 is the top left corner of the canvas.)

lineto(20,20);
this will draw a line from point 0,0 to point 20,20 on the canvas.
the next lineto will draw a line from the above 20,20 to the new point.

for example: a box,

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setpen(255,0,0,0,1);
moveto(0,0);
lineto(0,10);
lineto(10,10);
lineto(10,0);

simple 10x10 pixel box.

can also make the canvas itself a box by replacing the x 10s with width and the y 10s with height.

throughout a canvas you can make the pen colour change, if you want to outline the canvas in blue then draw a box in red. just simply write
setpen with another colour value before your box.

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setpen(0,0,255,0,1);
moveto(0,0);
lineto(width,0);
lineto(width,height);
lineto(0,height);

setpen(255,0,0,0,1);
moveto(10,10);
lineto(10,20);
lineto(20,20);
lineto(20,10);


there is also erase(0,0,0,0);
this is used to remove any unwanted lines/pixels. put this at the top of a script. (below any variable declarations (int i = 0;))

then putpixel(0,0);
this places 1 pixel in the position indecated.

hope this was helpful its how many minimaps are made on GE and many games in general, experiment with it and enjoy.

savvy

Love this tutorial!! It's awesome.
well done xxx

Nice
(I'd give you a point but I just gave one to Hblade)

lol, cheers mate

Never mind, you've got a point now^^

Nice

Interesting...
I tried to draw a rectangle with the mouse, but it always shows the previous draws on the screen. What is wrong? Here is the code of my canvas actor:

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int w,h;

setpen(0,0,255,0.0,1);
screen_to_actor(&xmouse, &ymouse);
w=x-xmouse;
h=y-ymouse;
moveto(0,0);
lineto(0,h);
lineto(w,h);
lineto(w,0);