X-Git-Url: https://git.r.bdr.sh/rbdr/canvas/blobdiff_plain/3717f7fbf9ec110b51fe002cdced5d73ebd6136b..587d8fe65d61b8f7217b4e8850b44e43159c16fb:/src/lib/components/sensor.svelte

diff --git a/src/lib/components/sensor.svelte b/src/lib/components/sensor.svelte
index e69de29..9458705 100644
--- a/src/lib/components/sensor.svelte
+++ b/src/lib/components/sensor.svelte
@@ -0,0 +1,33 @@
+<script>
+	import { browser } from '$app/environment';
+	import { maxSize } from '$lib/config';
+	import { modulo } from '$lib/math';
+	import { canvas } from '$lib/stores/canvas';
+	import { sensor } from '$lib/stores/widgets';
+
+	const kSensorSize = 2;
+
+	let left;
+	let right;
+	let top;
+	let bottom;
+
+	let timer;
+	const fetchItems = function fetchItems(left, top, right, bottom) {
+		clearTimeout(timer);
+		timer = setTimeout(() => {
+			sensor.set({ left, top, right, bottom });
+		}, 50);
+	};
+
+	$: {
+		if (browser) {
+			left = modulo($canvas.x - window.screen.width * kSensorSize, maxSize);
+			top = modulo($canvas.y - window.screen.height * kSensorSize, maxSize);
+			right = left + 2 * window.screen.width * kSensorSize;
+			bottom = top + 2 * window.screen.height * kSensorSize;
+
+			fetchItems(left, top, right, bottom);
+		}
+	}
+</script>
