5 replies to this topic

[epicCreations]

I've made it so that every step each object draws itself to the surface to create a trail. Unfortunately this trail doesn't ever fade, so I'm asking: How can I fade everything in a surface by an alpha? I've tried using bm_subtract in conjunction with clearing the screen in black (with an alpha), but that doesn't work, and since that doesn't work, I'm not sure what to try. Can anyone help me out?

epic Creations

[Steve III]

How about having a xprevious and yprevious like set of values that note where the object was, say, 3 seconds ago and draw, say, 5 images from oldest position to newest position with equal (or decreasing mabye?) spacing and increasing alpha value? Assuming you can draw the background to the surface at the beginning of each draw event then draw these images over the top of that. Anyway, doing this your trail will follow you and disappear after 3 seconds of being stationary.

[Obj_Control]

draw_clear_alpha(color,alpha);

That is, only if you only have the trail on the surface.

Edited by Obj_Control, 16 January 2010 - 05:11 AM.

[epicCreations]

draw_clear_alpha(color,alpha);

I've tried using bm_subtract in conjunction with clearing the screen in black (with an alpha), but that doesn't work, and since that doesn't work, I'm not sure what to try.

[Obj_Control]

draw a rectangle?

[A saurus1]

It won't work. Alpha is only ever added and multiplied as long as you keep multiplying the alpha by say .9999, it's never ever going to reach zero.