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[AuntEggma]

This is my first game. I'm working on a small platformer which consists of four static levels.  Each level has either a sun or moon object that moves slowly in a parabola across the width of the screen until it hits the end of the screen, and then moves to the next level.

I am trying to achieve a sort of really basic 'sunset/sunrise' effect where the background changes gradually depending on the position of the oSky (moon/sun) object.  I've been looking at what I have access to and it seems to me that changing the background's intensity is my best bet when it comes to generally 'lightening' or 'darkening' the background.

I can change the saturation to make my sky's colors more intense, and the value to make the background more light/dark.

Since I have a more-or-less static background image, I was wondering what the best way to change how light/dark/intense the background is over time.  Or in my case, not over time, but depending on the position of the oSky object along it's path.

To give more detail, I want to change my background's color properties(intensity) depending on where the oSky object is along its respective path.

If I'm not being clear enough, let me know and I'll find a way to distribute the code I've got so far.

[emptyfortress]

(assuming I understood correctly and you're working with plain backgrounds, not images) You can set the variable background_colour to the colour you want, combining this with the function make_colour_hsv() should get you the effect you want.

[AuntEggma]

(assuming I understood correctly and you're working with plain backgrounds, not images) You can set the variable background_colour to the colour you want, combining this with the function make_colour_hsv() should get you the effect you want.

I have a feeling a solution like this is probably what I'll wind up working with.

I'll use the oSkyObj's step event to change the background color depending on where it is along its path.

I was just wondering if there were any other ways of doing it gradually.

[AuntEggma]

I found a pretty cool answer by asking this elsewhere.  Here's how Hotline Miami did their title screen (which has all the elements of my changing background)

https://youtu.be/Z_WtTC-Kd_E?t=16s

In CREATION CODE of ObjBackground

Code:

dir = 0;
lastbonus = 0;
Bcolor1=$d800cd;   //change this colors to the value you want
Bcolor2=$0100fc;

DRAW EVENT of ObjBackground

Code:

//Adds direction .25
dir+=0.25

//Back color
color2=merge_color(c_white,c_gray,0.30)

//Front color             ,                                                                                                                   ,
color1=merge_color(c_black,merge_color(merge_color(Bcolor1,c_purple,0.5+lengthdir_x(0.5,dir*3.12)),c_fuchsia,0.125+lengthdir_y(0.125,dir*1.73)),0.75+lengthdir_y(0.25,dir*1.73))
draw_rectangle_color(view_xview[0]-60,view_yview[0]-60,view_xview[0]+view_wview[0]+60,view_yview[0]+view_hview[0]+60

[emptyfortress]

Oooh, that's clever.

I also didn't know the GML colour functions had both UK and US English spelling, cool.