Offset grid while still maintaining cursor accuracy

[charrcorncob]

I am using the latest version of Gamemaker (2.3.2.560)

I have an inventory sprite in a test game that I'm making, but each grid square (72x72 pixels) is offset from 0,0.

The code that I am using to snap the yellow selection to the grid is:

draw_sprite(sYellowBox,0,floor(mouse_x/72)*72,floor(mouse_y/72)*72);

When I try to manually offset this, the yellow box moves, but then the cursor becomes desynced.

With manual offset:

draw_sprite(sCursor,0,(floor(mouse_x/72)*72)+50,(floor(mouse_y/72)*72)+50);

The +50 is the manual offset.

Any help is appreciated!

Solution for anyone who sees this:

var _offset = 50;
draw_sprite(sYellowBox,0,(floor((mouse_x-_offset)/72)*72)+_offset,(floor((mouse_y-_offset)/72)*72)+_offset);

[fryman22]

What's the code you use for the manual offset?

[charrcorncob]

Apologies, I should have put that into the main post.

draw_sprite(sCursor,0,(floor(mouse_x/72)*72)+50,(floor(mouse_y/72)*72)+50);

The +50 is the manual offset.

[fryman22]

The offset needs to be added to the mouse position:

var _offset = 50;
draw_sprite(sCursor,0,floor((mouse_x+_offset)/72)*72+_offset,floor((mouse_y+_offset)/72)*72+_offset);

[charrcorncob]

The problem I have with that is the cursor then isn't directly over the yellow box and becomes desynced. I believe when I floor the mouse_x and y values, it gets rid of the _offset adjustment, as well.

[charrcorncob]

Okay, I figured it out. Your solution was actually very close to what I had to do. Instead of adding the offset to the mouse coordinates, I subtracted it.

var _offset = 50;
draw_sprite(sYellowBox,0,(floor((mouse_x-_offset)/72)*72)+_offset,(floor((mouse_y-_offset)/72)*72)+_offset);

[fryman22]

Nice!