X-Git-Url: https://git.r.bdr.sh/rbdr/canvas/blobdiff_plain/d7cea96940ddeb764c7343e05526f611863019d8..HEAD:/src/lib/components/widget.svelte

diff --git a/src/lib/components/widget.svelte b/src/lib/components/widget.svelte
index 7d587b5..87a3ee5 100644
--- a/src/lib/components/widget.svelte
+++ b/src/lib/components/widget.svelte
@@ -1,39 +1,66 @@
 <script>
-  import { bottomRight, topLeft } from '$lib/stores/canvas';
-  import { modulo } from '$lib/math';
-  import { maxSize } from '$lib/config';
-  export let widget;
+	import { bottomRight, topLeft } from '$lib/stores/canvas';
+	import { modulo } from '$lib/math';
+	import { maxSize } from '$lib/config';
+	export let widget;
 
-  const width = widget.box.right - widget.box.left;
-  const height = widget.box.bottom - widget.box.top;
+	const width = widget.box.right - widget.box.left;
+	const height = widget.box.bottom - widget.box.top;
 
-  $: renderX = widget.box.left - modulo($topLeft.x, maxSize);
-  $: renderY = widget.box.top - modulo($topLeft.y, maxSize);
+	// Coordinates in canvas space are (p,q)
+	// Coordinates in screen space are (x,y)
 
-  console.log('Max', maxSize,
-              'Widget Actual', widget.box.left, widget.box.top,
-              'Top Left', $topLeft.x, $topLeft.y,
-              'Mod Top Left', modulo($topLeft.x, maxSize), modulo($topLeft.y, maxSize),
-              'Calculated',
-              modulo(widget.box.left - modulo($topLeft.x, maxSize), maxSize),
-              modulo(widget.box.top - modulo($topLeft.y, maxSize), maxSize))
+	$: xWidget = 0;
+	$: yWidget = 0;
 
+	$: {
+		const pCanvas = modulo($topLeft.x, maxSize);
+		const qCanvas = modulo($topLeft.y, maxSize);
+
+		const pBoundary = pCanvas + Math.abs($topLeft.x - $bottomRight.x);
+		const qBoundary = qCanvas + Math.abs($topLeft.y - $bottomRight.y);
+
+		const pWidget = widget.box.left;
+		const qWidget = widget.box.top;
+
+		xWidget = pWidget - pCanvas;
+		yWidget = qWidget - qCanvas;
+
+		// Case 1: Boundary jump happens inside the box
+		if (pWidget < pCanvas && pBoundary > maxSize && pWidget < pBoundary - maxSize) {
+			xWidget = xWidget + maxSize;
+		}
+		// Case 2: Boundary jump happens to the left of the box
+		else if (pWidget > pCanvas && pBoundary < maxSize && pWidget > pBoundary) {
+			xWidget = xWidget - maxSize;
+		}
+
+		// Case 1: Boundary jump happens inside the box
+		if (qWidget < qCanvas && qBoundary > maxSize && qWidget < qBoundary - maxSize) {
+			yWidget = yWidget + maxSize;
+		}
+		// Case 2: Boundary jump happens above the top of the box
+		else if (qWidget > qCanvas && qBoundary < maxSize && qWidget > qBoundary) {
+			yWidget = yWidget - maxSize;
+		}
+	}
 </script>
 
-<div class="widget"
-  style:width="{width}px"
-  style:height="{height}px"
-  style:left="{renderX}px"
-  style:top="{renderY}px"
+<div
+	class="widget"
+	style:width="{width}px"
+	style:height="{height}px"
+	style:left="{xWidget}px"
+	style:top="{yWidget}px"
 >
-  {widget.type}
+	{widget.type}
 </div>
 
 <style>
-  .widget {
-    position: fixed;
-    background-color: #f0f;
-    border: 1px solid black;
-    opacity: 0.5;
-  }
+	.widget {
+		position: fixed;
+		background-color: #f0f;
+		border: 1px solid black;
+		opacity: 0.5;
+	}
 </style>