Pixel-Composer/scripts/area_function/area_function.gml
2024-08-30 16:08:30 +07:00

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enum AREA_DISTRIBUTION {
area,
border
}
enum AREA_SCATTER {
uniform,
random
}
function area_get_bbox(area) {
return [ area[0] - area[2], area[1] - area[3], area[0] + area[2], area[1] + area[3] ];
}
function area_get_random_point(area, distrib = AREA_DISTRIBUTION.area, scatter = AREA_SCATTER.random, index = 0, total = 1) {
if(total == 0) return [0, 0];
var _area_x = array_safe_get_fast(area, 0);
var _area_y = array_safe_get_fast(area, 1);
var _area_w = array_safe_get_fast(area, 2);
var _area_h = array_safe_get_fast(area, 3);
var _area_t = array_safe_get_fast(area, 4);
var xx = 0, yy = 0;
index = safe_mod(index, total);
switch(distrib) {
case AREA_DISTRIBUTION.area :
if(scatter == AREA_SCATTER.uniform) {
if(_area_t == AREA_SHAPE.rectangle) {
var _col = ceil(sqrt(total));
var _row = ceil(total / _col);
var _iwid = _area_w * 2 / _col;
var _ihig = _area_h * 2 / _row;
var _irow = floor(index / _col);
var _icol = safe_mod(index, _col);
xx = _area_x - _area_w + (_icol + 0.5) * _iwid;
yy = _area_y - _area_h + (_irow + 0.5) * _ihig;
//print($"{yy} = {_area_y} - {_area_h} + ({_irow} + 0.5) * {_ihig}")
} else {
if(index == 0) {
xx = _area_x;
yy = _area_y;
break;
}
var _r = _area_w;
var _a = _area_w / _area_h;
var _tm = floor(total / (2 * pi));
var _tn = ceil(sqrt(2 * _tm + 1 / 2) - 1 / 2);
var _s = _r / _tn;
var _m = floor(index / (2 * pi));
var _n = floor(sqrt(2 * _m + 1 / 2) - 1 / 2);
var _sr = (_n + 1) * _s;
var _tt = floor((_n * (_n + 1)) / 2 * pi * 2);
var _sa = (index - _tt) / (min(total - _tt, floor((_n + 1) * 2 * pi)) - 1) * 360;
xx = _area_x + lengthdir_x(_sr, _sa);
yy = _area_y + lengthdir_y(_sr, _sa) / _a;
}
} else if(scatter == AREA_SCATTER.random) {
if(_area_t == AREA_SHAPE.rectangle) {
xx = _area_x + random_range(-_area_w, _area_w);
yy = _area_y + random_range(-_area_h, _area_h);
} else if(_area_t == AREA_SHAPE.elipse) {
var rr = random(360);
xx = _area_x + lengthdir_x(1, rr) * random(_area_w);
yy = _area_y + lengthdir_y(1, rr) * random(_area_h);
}
}
break;
case AREA_DISTRIBUTION.border :
if(scatter == AREA_SCATTER.uniform) {
if(_area_t == AREA_SHAPE.rectangle) {
var perimeter = _area_w * 4 + _area_h * 4;
var d = perimeter / total;
var l = perimeter * index / total;
if(l <= _area_w * 2) {
xx = _area_x - _area_w + l;
yy = _area_y - _area_h;
break;
} l -= _area_w * 2;
if(l <= _area_h * 2) {
xx = _area_x + _area_w;
yy = _area_y - _area_h + l;
break;
} l -= _area_h * 2;
if(l <= _area_w * 2) {
xx = _area_x + _area_w - l;
yy = _area_y + _area_h;
break;
} l -= _area_w * 2;
if(l <= _area_h * 2) {
xx = _area_x - _area_w;
yy = _area_y + _area_h - l;
break;
} l -= _area_h * 2;
} else if(_area_t == AREA_SHAPE.elipse) {
var rr = 360 * index / total;
xx = _area_x + lengthdir_x(_area_w, rr);
yy = _area_y + lengthdir_y(_area_h, rr);
}
} else if(scatter == AREA_SCATTER.random) {
if(_area_t == AREA_SHAPE.rectangle) {
var perimeter = _area_w * 2 + _area_h * 2;
var i = random(perimeter);
if(i < _area_w) {
xx = _area_x + random_range(-_area_w, _area_w);
yy = _area_y - _area_h;
} else if(i < _area_w + _area_h) {
xx = _area_x - _area_w;
yy = _area_y + random_range(-_area_h, _area_h);
} else if(i < _area_w * 2 + _area_h) {
xx = _area_x + random_range(-_area_w, _area_w);
yy = _area_y + _area_h;
} else {
xx = _area_x + _area_w;
yy = _area_y + random_range(-_area_h, _area_h);
}
} else if(_area_t == AREA_SHAPE.elipse) {
var rr = random(360);
xx = _area_x + lengthdir_x(_area_w, rr);
yy = _area_y + lengthdir_y(_area_h, rr);
}
}
break;
}
return [xx, yy];
}