next »

[Doctor Universe]

Hello all! I've got a question that probably has a rather complex answer! Anyway. I need help getting units to move based on tiles (or a grid, what have you). I need this to be in real time for the concept to work. Likewise, I Would prefer the units to not pass through each other, assuming a criss-cross is requires during one of the movements. ( Basically I want them to move around each other, instead of through). If this is too vague, just let me know and I'll clarify, thanks.

[ChevyRay]

Just set a destination position. For example, if you want them to walk to where you click the mouse, you'd go:

Code:

walkto_x = ((mouse_x / grid_w) div 1) * grid_w;
walkto_y = ((mouse_y / grid_h) div 1) * grid_h;

grid_w and grid_h would be the width and height of your grid squares.

If you already have the correct position, just set walkto_x and walkto_y to where you want it to go.

Anyways, have them move towards that position, avoiding collision with other units while doing so. You could always just have them stop moving while a unit occupies the next position, so if they "criss-cross", one will always stop and let the other pass first.

I'm not 100% clear on what it is you need exactly, but if you can't get it to work, I'll write up an example for you.

EDIT: also, there is a "game maker" message icon you can specify for your post, to let you know you are working with GML. Derek just added these recently, I believe.

[Mikademus]

Is this a 2D plane viewed from above? If so, and if we ignore terrain and consider the arena a perfect plane, then you could relatively easily solve this my bounding spheres and simple vector math.

Each unit has a bounding sphere around it of radius r. Each unit move along their ideal vector toward their goal. If two bounding spheres intersect each move one step along the right axis to the vector between the units' positions [right = crossp(other->pos - this->pos, vector(0,1,0));]. If that too is a collision, let that unit wait, and on a plane any pile-up will sort itself out from the edges.