GML Drawing multiple lines within a certain area.

[darijs1]

Basically, im trying to make very simple grass, from single lines (draw_line). The problem is, i have 1 piece of grass ready to go, but i want as many as an "ammount" variable would say.

To explain more simply and easy to understand, i have the draw event saying "draw_line(x,y,xx,yy)"
now how do i draw as many as i want without rewriting the code 50 times. each "draw_line" would have their own randomized position within a range (32 in this case.)

ive copy/pasted scripts that do something like this with "i += blablabla" but ive never done this myself and have no idea how to do it or what it means.

my appologies if i havent been very clear or do not know what im talking about.

 

[JON213]

I would do something like this to draw the grass 50 times

repeat(50)
{
draw_line(x,y,xx,yy);
}

 

[darijs1]

I would do something like this to draw the grass 50 times

repeat(50)
{
draw_line(x,y,xx,yy);
}

I thought so too, but thats not what this is about (atleast i think). The problem is i want each drawn line to have their own unique random variable (x,y+random(32))
But i cant just do that because it would randomize each line every step.

 

[Slyddar]

This will do what you want, but not sure if it's a good use of resources.

//create
for (var i = 0; i < 50; i++) {
  x1[i] = random(32);
  x2[i] = random(32);
  y1[i] = random(32);
  y2[i] = random(32);
}

//draw
for (var i = 0; i < 50; i++) draw_line(x1[i], y1[i], x2[i], y2[i]);

A better method might be something like this:

global.asset_layer = layer_create(-10000);     //create asset layer, choose your depth
var gridsize = 32,
    w = room_width/32,
    h = room_height/32,
    spr_id,
    spr = s_grass;
for (var i = 0; i < w; ++i) {
    for (var j = 0; j < h; ++j) {
        spr_id = layer_sprite_create(global.asset_layer, i * gridsize, j * gridsize, spr);
        layer_sprite_index(spr_id, irandom(sprite_get_number(spr)));
        layer_sprite_speed(spr_id, 0);
    }
}

 

[darijs1]

This will do what you want, but not sure if it's a good use of resources.

//create
for (var i = 0; i < 50; i++) {
  x1[i] = random(32);
  x2[i] = random(32);
  y1[i] = random(32);
  y2[i] = random(32);
}

//draw
for (var i = 0; i < 50; i++) draw_line(x1[i], y1[i], x2[i], y2[i]);

A better method might be something like this:

global.asset_layer = layer_create(-10000);     //create asset layer, choose your depth
var gridsize = 32,
    w = room_width/32,
    h = room_height/32,
    spr_id,
    spr = s_grass;
for (var i = 0; i < w; ++i) {
    for (var j = 0; j < h; ++j) {
        spr_id = layer_sprite_create(global.asset_layer, i * gridsize, j * gridsize, spr);
        layer_sprite_index(spr_id, irandom(sprite_get_number(spr)));
        layer_sprite_speed(spr_id, 0);
    }
}

It is indeed a terrible tax on resources. i was more interested on how this was done.This seems to be what i was looking for. thanks for the help.

 

[TheouAegis]

Don't use Studio2, so not sure how efficient sprite layers are. I know they're more "permanent" than surfaces and you wouldn't need to check each step if the layer got destroyed like you would with a surface, but sprite layers seem to me like they would have to maintain a list of every grass sprite drawn to them, which would be a massive list in large rooms. Using pre-rendered grass sprites is still a lot better than drawing 10,000 lines, though.