X-Git-Url: https://git.r.bdr.sh/rbdr/canvas/blobdiff_plain/d7cea96940ddeb764c7343e05526f611863019d8..e4e4b5202bf0039127f591941fddc1ff5ca09897:/src/lib/components/widget.svelte

diff --git a/src/lib/components/widget.svelte b/src/lib/components/widget.svelte
index 7d587b5..907a016 100644
--- a/src/lib/components/widget.svelte
+++ b/src/lib/components/widget.svelte
@@ -7,24 +7,74 @@
   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 - $bottomRight.y);
+
+    const pWidget = widget.box.left;
+    const qWidget = widget.box.top;
+
+    xWidget = pWidget - pCanvas;
+    yWidget = qWidget - qCanvas;
+
+    // Case 1: Boundary jump happens inside the box
+    if (pWidget < pCanvas
+        && pBoundary > maxSize
+        && pWidget < pBoundary - maxSize) {
+      xWidget = xWidget + maxSize;
+    }
+    // Case 2: Boundary jump happens to the left of the box
+    else if (pWidget > pCanvas
+        && pBoundary < maxSize
+        && pWidget > pBoundary) {
+      xWidget = xWidget - maxSize;
+    }
+
+    // Case 1: Boundary jump happens inside the box
+    if (qWidget < qCanvas
+        && qBoundary > maxSize
+        && qWidget < qBoundary - maxSize) {
+      yWidget = yWidget + maxSize;
+    }
+    // Case 2: Boundary jump happens above the top of the box
+    else if (qWidget > qCanvas
+        && qBoundary < maxSize
+        && qWidget > qBoundary) {
+      yWidget = yWidget - maxSize;
+    }
+
+
+    console.log('Max', maxSize,
+                'Widget Actual', widget.box.left, widget.box.top,
+                'Canvas WH', Math.abs($topLeft.x - $bottomRight.x), Math.abs($topLeft.y - $bottomRight.y),
+                'Canvas XY', $topLeft.x, $topLeft.y,
+                'Canvas PQ', pCanvas, qCanvas,
+                'Boundary XY', $bottomRight.x, $bottomRight.y,
+                'Boundary PQ', pBoundary, qBoundary,
+                'Widget Rendered', xWidget, yWidget,
+                'Calculated',
+                modulo(pWidget - pCanvas, maxSize),
+                modulo(qWidget - qCanvas, maxSize))
+
+  }
 
 </script>
 
 <div class="widget"
   style:width="{width}px"
   style:height="{height}px"
-  style:left="{renderX}px"
-  style:top="{renderY}px"
+  style:left="{xWidget}px"
+  style:top="{yWidget}px"
 >
   {widget.type}
 </div>