leif/lexys-labyrinth
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Round to the pixel grid when drawing

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This commit is contained in:
Eevee (Evelyn Woods) 2020-09-03 09:44:49 -06:00
parent 13dc5f73b1
commit 44978490ed
1 changed files with 6 additions and 2 deletions
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8
js/renderer-canvas.js
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@ -42,13 +42,14 @@ export class CanvasRenderer {
let [px, py] = this.level.player.visual_position(tic_offset);
let x0 = Math.max(0, Math.min(this.level.width - this.viewport_size_x, px - xmargin));
let y0 = Math.max(0, Math.min(this.level.height - this.viewport_size_y, py - xmargin));
// Round to the pixel grid
x0 = Math.floor(x0 * this.tileset.size_x + 0.5) / this.tileset.size_x;
y0 = Math.floor(y0 * this.tileset.size_y + 0.5) / this.tileset.size_y;
this.viewport_x = x0;
this.viewport_y = y0;
// The viewport might not be aligned to the grid, so split off any fraction
let xf0 = Math.floor(x0);
let yf0 = Math.floor(y0);
let xoff = xf0 - x0;
let yoff = yf0 - y0;
let x1 = Math.ceil(x0 + this.viewport_size_x - 1);
let y1 = Math.ceil(y0 + this.viewport_size_y - 1);
// Draw in layers, so animated objects aren't overdrawn by neighboring terrain
@ -67,6 +68,9 @@ export class CanvasRenderer {
if (tile.type.is_actor) {
// Handle smooth scrolling
let [vx, vy] = tile.visual_position(tic_offset);
// Round this to the pixel grid too!
vx = Math.floor(vx * this.tileset.size_x + 0.5) / this.tileset.size_x;
vy = Math.floor(vy * this.tileset.size_y + 0.5) / this.tileset.size_y;
this.tileset.draw(tile, this.level, ctx, vx - x0, vy - y0);
}
else {