leif/lexys-labyrinth
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Add a little noise to the rewind effect

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This commit is contained in:
Eevee (Evelyn Woods) 2024-05-05 14:55:24 -06:00
parent d54ba0a191
commit 4527eb972e
1 changed files with 18 additions and 2 deletions
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20
js/renderer-canvas.js
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@ -1,5 +1,5 @@
import { DIRECTIONS, LAYERS } from './defs.js';
import { mk } from './util.js';
import * as util from './util.js';
import { DrawPacket } from './tileset.js';
import TILE_TYPES from './tiletypes.js';
@ -73,7 +73,7 @@ export class CanvasRenderer {
// This is here so command-line Node stuff can swap it out for the canvas package
static make_canvas(w, h) {
return mk('canvas', {width: w, height: h});
return util.mk('canvas', {width: w, height: h});
}
// Draw a single tile, or even the name of a tile type. Either a canvas or a context may be given.
@ -380,6 +380,8 @@ export class CanvasRenderer {
draw_rewind_effect(clock) {
// Shift several rows over in a recurring pattern, like a VHS, whatever that is
let rewind_start = clock / 20 % 1;
// Draw noisy white stripes in there too
this.ctx.save();
for (let chunk = 0; chunk < 4; chunk++) {
let y = Math.floor(this.canvas.height * (chunk + rewind_start) / 4);
for (let dy = 1; dy < 5; dy++) {
@ -387,8 +389,22 @@ export class CanvasRenderer {
this.canvas,
0, y + dy, this.canvas.width, 1,
-dy * dy, y + dy, this.canvas.width, 1);
this.ctx.beginPath();
this.ctx.moveTo(0, y + dy + 0.5);
this.ctx.lineTo(this.canvas.width, y + dy + 0.5);
let alpha = (0.9 - y / this.canvas.height * 0.25) * ((dy - 1) / 3);
this.ctx.strokeStyle = `rgba(100%, 100%, 100%, ${alpha})`;
this.ctx.setLineDash([
util.random_range(4, 20),
util.random_range(2, 6),
util.random_range(4, 20),
util.random_range(2, 6),
]);
this.ctx.stroke();
}
}
this.ctx.restore();
}
// Used by the editor and map previews. Draws a region of the level (probably a StoredLevel),