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<script>
import { browser } from '$app/env';
import Background from '$lib/components/background.svelte';
import Palette from '$lib/components/palette.svelte';
import Hud from '$lib/components/hud.svelte';
const kCoordinateLength = 6;
const kMaxSize = Math.pow(16, kCoordinateLength);
$: x = 0;
$: y = 0;
$: shouldShowPalette = false;
let dragging = false;
const modulo = function modulo (number, base) {
return ((number % base) + base) % base
};
const moveCanvas = function moveCanvas(event) {
if (dragging) {
let deltaX = event.x - dragging.x;
let deltaY = event.y - dragging.y;
x = modulo(x - deltaX, kMaxSize);
y = modulo(y - deltaY, kMaxSize);
dragging.x = event.x;
dragging.y = event.y;
}
}
const startDragging = function startDragging(event) {
dragging = {
x: event.x,
y: event.y
};
}
const stopDragging = function startDragging() {
dragging = null;
}
const showPalette = function showPalette(event) {
event.preventDefault();
dragging = null;
document.documentElement.style.setProperty('--palette-x', event.clientX + 'px');
document.documentElement.style.setProperty('--palette-y', event.clientY + 'px');
shouldShowPalette = true;
}
const hidePalette = function hidePalette() {
event.preventDefault();
shouldShowPalette = false;
}
</script>
<div
class="canvas"
on:click={hidePalette}
on:contextmenu={showPalette}
on:mousedown={startDragging}
on:mouseup={stopDragging}
on:mousemove={moveCanvas}>
>
<Background x={x} y={y}/>
<Hud x={x} y={y} />
{#if shouldShowPalette }
<Palette/>
{/if}
</div>
<style>
.canvas {
user-select: none;
padding: 0;
margin: 0;
width: 100vw;
height: 100vh;
}
</style>
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