diff --git a/walkers.js b/walkers.js
index 79c7494..33e6b74 100644
--- a/walkers.js
+++ b/walkers.js
@@ -1,10 +1,3 @@
-var constants = {
- step_time: 200,
- cell_size: 22,
- color: "#FFB000",
-};
-
-
/****************************************************************************
* TODO: CATEOGORIZE THESE BULLSHITS *
****************************************************************************/
@@ -28,10 +21,9 @@ Number.prototype.div = function(divisor) {
****************************************************************************/
function init_walk() {
- // Draw a grid of boxes on the canvas
- setInterval(draw, 20);
- // TODO: it would be cool to have this changable, but I may just ... not
- setInterval(move_walker, constants.step_time);
+ setInterval(update_size, 20);
+ setInterval(update_walkers, 200);
+ setInterval(update_trails, 200);
}
// check if the trails array has a position.
@@ -46,35 +38,49 @@ function trails_find_position(row, col) {
return null;
}
-function move_walker() {
- // leave a trail behind
- var index = trails_find_position(walker.row, walker.col);
- if (index) {
- trails[index].color = walker.color;
- } else {
- trails.push({row: walker.row, col: walker.col, color: walker.color});
- }
-
+function update_trails() {
// for all existing trails, make them darker
for (var i = 0; i < trails.length; i++) {
- var t = trails[i];
- t.color = tweak_color_luminance(t.color, -0.1);
+ var darker = tweak_color_luminance(trails[i].color, -0.1);
+ trails[i].color = darker;
// delete any trails with 0 for first digit of RGB
// (think of them as near-black)
// e.g. #050500
- if (t.color[1] === "0" && t.color[3] == "0" && t.color[5] == "0") {
- // draw black there just to be safe
- draw_grid_square(t.row, t.col, "black");
+ if (darker[1] === "0" && darker[3] == "0" && darker[5] == "0") {
+ // draw black, just so we don't leave behind an almost-black square
+ draw_grid_square(trails[i].row, trails[i].col, "black");
// delete the item from the array
trails.splice(i, 1);
}
}
- console.log(`${trails.length} items in trails array`);
- // move in random dir
- add_random_direction(walker);
+ // after all trails have been darkened/removed, draw the remaining ones
+ for (var i = 0; i < trails.length; i++) {
+ draw_grid_square(trails[i].row, trails[i].col, trails[i].color);
+ }
+}
+
+function update_walkers() {
+ // move all walkers, creating trails behind them
+ for (var i = 0; i < walkers.length; i++) {
+ // leave a trail behind
+ var index = trails_find_position(walkers[i].row, walkers[i].col);
+ if (index) {
+ trails[index].color = walkers[i].color;
+ } else {
+ trails.push({row: walkers[i].row, col: walkers[i].col, color: walkers[i].color});
+ }
+
+ // move in random dir
+ add_random_direction(walkers[i]);
+ }
+
+ // draw a colored square at walker locations
+ for (var i = 0; i < walkers.length; i++) {
+ draw_grid_square(walkers[i].row, walkers[i].col, walkers[i].color);
+ }
}
function add_random_direction(pos) {
@@ -118,49 +124,29 @@ function tweak_color_luminance(hex, lum) {
return rgb;
}
-function draw() {
- // pixel width and height
- var old_width = ctx.canvas.width;
- var old_height = ctx.canvas.height;
- canvas.width = window.innerWidth;
- canvas.height = window.innerHeight;
+function update_size() {
+ if (canvas.width != window.innerWidth || canvas.height != window.innerHeight) {
+ // note: changing width and height clears the canvas, so this will cause a
+ // black screen until the next draw call for each thing.
+ canvas.width = window.innerWidth;
+ canvas.height = window.innerHeight;
- if (old_width !== canvas.width || old_height != canvas.height) {
- var old_n_rows = n_rows;
- var old_n_cols = n_cols;
- n_rows = canvas.height.div(constants.cell_size);
- n_cols = canvas.width.div(constants.cell_size);
- offset_h = (canvas.width - (constants.cell_size * n_cols)).div(2);
- offset_v = (canvas.height - (constants.cell_size * n_rows)).div(2);
- offset = {h: offset_h, v: offset_v};
- // TODO: for every walker and every trail, adjust their position to the new canvas size
- // we wanna just mod it, probably. that way if you shrink it you don't
- // lose anything.
-
- // TODO: HANDLE RESIZE
- console.log(`dimensions changed from ${old_width}x${old_height} to ${ctx.canvas.width}x${ctx.canvas.height}`);
+ // update all the globals we're using to
+ n_rows = canvas.height.div(cell_size);
+ n_cols = canvas.width.div(cell_size);
+ offset_h = (canvas.width - (cell_size * n_cols)).div(2);
+ offset_v = (canvas.height - (cell_size * n_rows)).div(2);
}
-
- // draw a colored square at the walker location
- draw_grid_square(walker.row, walker.col, walker.color);
-
- // for any trails, draw them
- for (var i = 0; i < trails.length; i++) {
- t = trails[i];
- draw_grid_square(t.row, t.col, t.color);
- }
-
- // TODO CODE
}
function draw_grid_square(row, col, color) {
var margin = 2;
ctx.fillStyle = color;
- var pos_h = offset.h + (constants.cell_size * col) + margin;
- var pos_v = offset.v + (constants.cell_size * row) + margin;
+ var pos_h = offset_h + (cell_size * col) + margin;
+ var pos_v = offset_v + (cell_size * row) + margin;
- ctx.fillRect(pos_h, pos_v, constants.cell_size - (2*margin), constants.cell_size - (2*margin));
+ ctx.fillRect(pos_h, pos_v, cell_size - (2*margin), cell_size - (2*margin));
}
/****************************************************************************
@@ -174,13 +160,17 @@ canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
// compute the initial rows and columns
-var n_rows = canvas.height.div(constants.cell_size);
-var n_cols = canvas.width.div(constants.cell_size);
-var offset_h = (canvas.width - (constants.cell_size * n_cols)).div(2);
-var offset_v = (canvas.height - (constants.cell_size * n_rows)).div(2);
-var offset = {h: offset_h, v: offset_v};
+var cell_size = 22;
+var n_rows = canvas.height.div(cell_size);
+var n_cols = canvas.width.div(cell_size);
+var offset_h = (canvas.width - (cell_size * n_cols)).div(2);
+var offset_v = (canvas.height - (cell_size * n_rows)).div(2);
// set start position of walker and start the random walk
-var walker = {row: n_rows.div(2), col: n_cols.div(2), color: constants.color};
+var walkers = [
+ {row: n_rows.div(2), col: n_cols.div(2), color: "#FFB000"},
+ {row: 0, col: 0, color: "#ff0000"},
+ {row: n_rows, col: 0, color: "#00ff00"},
+];
trails = []
init_walk();