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[Trystin]

Curious as to how you would go about getting scan lines in gm studio correctly?

Such as in Maldita Castilla

Or Lone Survivor

Im thinking its probably just a nifty transparent png file that you apply to a surface with a blend mode or something. Not completely sure how to go about it the right way so it doesn't obscure the image below too much.

Thanks

[Trystin]

any takers?

[indie11]

You are right! it actually is a transparent image with effects(for example a gradient)
I am not sure how its done in GM but normally you can put it on the HUD or the top layer of entities and move it with respect to the camera

[Trystin]

Thanks! Although I'm still fishing for a game maker based answer this points me in the right direction.

[fraxcell]

My preferred method would be using surfaces (much more flexible), although you could also use sprites.
In the create event of some object, you can use a script like this to create a surface consisting of horizontal lines.

Code:

//create scan lines surface
surf_scanlines = surface_create(view_wview[0],view_hview[0]);
surface_set_target(surf_scanlines);
draw_clear_alpha(c_white, 0);
    
for(i=0; i<view_hview[0]; i+=2)
     draw_line(0, i, view_wview[0], i);

Then to draw the surface, just use this:

Code:

draw_surface_ext(surf_scanlines, 0, 0, 1, 1, 0, -1, 0.4);

For best results, combine the scanlines with a noise effect. This can be created in a similar manner, this time drawing dots rather than lines.

Code:

//create noise surface 
surf_noise = surface_create(view_wview[0],view_hview[0]);
surface_set_target(surf_noise);
draw_clear_alpha(c_white, 0);
    
for(i=0; i<view_wview[0]; i+=1)
    for(j=0; j<view_hview[0]; j+=1)
        if floor(random(3))=0
            draw_point(i,j);

And then draw the noise with this:

Code:

draw_surface_ext(surf_noise, 0, 0, choose(0,1), choose(0,1), 0, -1, 0.3);

 

[Trystin]

Thanks so much! I will try this right now.