Pixel-Composer/scripts/node_onion_skin/node_onion_skin.gml

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function Node_Onion_Skin(_x, _y, _group = noone) : Node(_x, _y, _group) constructor {
name = "Onion Skin";
use_cache = CACHE_USE.manual;
clearCacheOnChange = false;
inputs[| 0] = nodeValue("Surface in", self, JUNCTION_CONNECT.input, VALUE_TYPE.surface, noone);
inputs[| 1] = nodeValue("Range", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, [-1, 1])
.setDisplay(VALUE_DISPLAY.slider_range, { range: [ -16, 16, 0.1 ] });
inputs[| 2] = nodeValue("Alpha", self, JUNCTION_CONNECT.input, VALUE_TYPE.float, 0.5)
.setDisplay(VALUE_DISPLAY.slider);
inputs[| 3] = nodeValue("Color pre", self, JUNCTION_CONNECT.input, VALUE_TYPE.color, c_red)
inputs[| 4] = nodeValue("Color post", self, JUNCTION_CONNECT.input, VALUE_TYPE.color, c_blue)
inputs[| 5] = nodeValue("Step", self, JUNCTION_CONNECT.input, VALUE_TYPE.integer, 1)
inputs[| 6] = nodeValue("On top", self, JUNCTION_CONNECT.input, VALUE_TYPE.boolean, true, "Render current frame on top of all frames.")
outputs[| 0] = nodeValue("Output", self, JUNCTION_CONNECT.output, VALUE_TYPE.surface, noone);
input_display_list = [
["Surface", false], 0, 1, 5,
["Render", false], 2, 3, 4, 6,
];
insp2UpdateTooltip = "Clear cache";
insp2UpdateIcon = [ THEME.cache, 0, COLORS._main_icon ];
static onInspector2Update = function() { clearCache(); }
static update = function() {
if(!inputs[| 0].value_from) return;
var _surf = getInputData(0);
var _rang = getInputData(1);
var _alph = getInputData(2);
var _cpre = getInputData(3);
var _cpos = getInputData(4);
var _step = getInputData(5);
var _top = getInputData(6);
cacheCurrentFrame(_surf);
var _outSurf = outputs[| 0].getValue();
_outSurf = surface_verify(_outSurf, surface_get_width_safe(_surf), surface_get_height_safe(_surf));
outputs[| 0].setValue(_outSurf);
surface_set_target(_outSurf);
DRAW_CLEAR
var fr = CURRENT_FRAME;
var st = min(_rang[0], _rang[1]);
var ed = max(_rang[0], _rang[1]);
st = sign(st) * floor(abs(st) / _step) * _step;
ed = sign(ed) * floor(abs(ed) / _step) * _step;
st += fr;
ed += fr;
for( var i = st; i <= ed; i += _step ) {
var surf = getCacheFrame(i);
if(!is_surface(surf)) continue;
var aa = power(_alph, abs(i - fr));
var cc = c_white;
if(i < fr) cc = _cpre;
else if(i > fr) cc = _cpos;
draw_surface_ext_safe(surf, 0, 0, 1, 1, 0, cc, aa);
}
if(_top) draw_surface_safe(_surf);
surface_reset_target();
}
}