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Improve loop for Turtle#update

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This commit is contained in:
Sebastian Serth
2023-03-03 14:09:30 +01:00
parent 9508369b98
commit 025fa355d2
1 changed files with 6 additions and 8 deletions
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14
app/assets/javascripts/turtle.js
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@ -79,20 +79,18 @@ function Turtle(unused_pipe_reference, canvas) {
} }
Turtle.prototype.update = function () { Turtle.prototype.update = function () {
var i, k, canvas, ctx, dx, dy, item, c, length; let k, c;
canvas = this.canvas[0]; const canvas = this.canvas[0];
canvas.width = this.get_width() * devicePixelRatio; canvas.width = this.get_width() * devicePixelRatio;
canvas.height = this.get_height() * devicePixelRatio; canvas.height = this.get_height() * devicePixelRatio;
canvas.style.width = `${this.get_width()}px`; canvas.style.width = `${this.get_width()}px`;
canvas.style.height = `${this.get_height()}px`; canvas.style.height = `${this.get_height()}px`;
ctx = canvas.getContext('2d'); const ctx = canvas.getContext('2d');
ctx.clearRect(0, 0, this.get_width(), this.get_height()); ctx.clearRect(0, 0, this.get_width(), this.get_height());
ctx.scale(devicePixelRatio, devicePixelRatio); ctx.scale(devicePixelRatio, devicePixelRatio);
length = this.items.length; const dx = canvas.width / (2 * devicePixelRatio);
dx = canvas.width / (2 * devicePixelRatio); const dy = canvas.height / (2 * devicePixelRatio);
dy = canvas.height / (2 * devicePixelRatio); for (let item of this.items) {
for (i = 0; i < length; i += 1) {
item = this.items[i];
c = item.coords; c = item.coords;
switch (item.type) { switch (item.type) {
case 'line': case 'line':