From d207f1da2c8a6f95be25119c41f8660f25029c88 Mon Sep 17 00:00:00 2001
From: Yaro Kasear <git@kasear.net>
Date: Fri, 5 Dec 2025 09:29:50 -0600
Subject: [PATCH] More features added to our draw widget.

---
 inventory/templates/testing.html | 508 +++++++++++++++++--------------
 1 file changed, 285 insertions(+), 223 deletions(-)

diff --git a/inventory/templates/testing.html b/inventory/templates/testing.html
index 3134152..fab20b9 100644
--- a/inventory/templates/testing.html
+++ b/inventory/templates/testing.html
@@ -8,10 +8,10 @@
 
 #grid {
     background-image:
-    linear-gradient(to right, #ccc 1px, transparent 1px),
-    linear-gradient(to bottom, #ccc 1px, transparent 1px);
+        linear-gradient(to right, #ccc 1px, transparent 1px),
+        linear-gradient(to bottom, #ccc 1px, transparent 1px);
     background-size: var(--grid) var(--grid);
-    cursor: none;
+    cursor: crosshair;
     height: 80vh;
     width: 100%;
     height: calc(round(nearest, 80vh, var(--grid)) + 1px);
@@ -65,272 +65,334 @@
                 </label>
 
                 <input type="radio" class="btn-check" id="line" name="tool">
-                <label for="line" class="btn btn-sm btn-light border d-inline-flex align-items-center justify-content-center">
+                <label for="line"
+                    class="btn btn-sm btn-light border d-inline-flex align-items-center justify-content-center">
                     ⎯
                 </label>
             </div>
+            <div class="vr mx-1"></div>
+            <div class="btn-group">
+                <button type="button"
+                    class="btn btn-sm btn-light border d-inline-flex align-items-center justify-content-center"
+                    id="export">
+                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor"
+                        class="bi bi-floppy" viewBox="0 0 16 16">
+                        <path d="M11 2H9v3h2z" />
+                        <path
+                            d="M1.5 0h11.586a1.5 1.5 0 0 1 1.06.44l1.415 1.414A1.5 1.5 0 0 1 16 2.914V14.5a1.5 1.5 0 0 1-1.5 1.5h-13A1.5 1.5 0 0 1 0 14.5v-13A1.5 1.5 0 0 1 1.5 0M1 1.5v13a.5.5 0 0 0 .5.5H2v-4.5A1.5 1.5 0 0 1 3.5 9h9a1.5 1.5 0 0 1 1.5 1.5V15h.5a.5.5 0 0 0 .5-.5V2.914a.5.5 0 0 0-.146-.353l-1.415-1.415A.5.5 0 0 0 13.086 1H13v4.5A1.5 1.5 0 0 1 11.5 7h-7A1.5 1.5 0 0 1 3 5.5V1H1.5a.5.5 0 0 0-.5.5m3 4a.5.5 0 0 0 .5.5h7a.5.5 0 0 0 .5-.5V1H4zM3 15h10v-4.5a.5.5 0 0 0-.5-.5h-9a.5.5 0 0 0-.5.5z" />
+                    </svg>
+                </button>
+                <button type="button"
+                    class="btn btn-sm btn-danger border d-inline-flex align-items-center justify-content-center"
+                    id="clear">
+                    <svg xmlns="http://www.w3.org/2000/svg" width="16" height="16" fill="currentColor"
+                        class="bi bi-x-lg" viewBox="0 0 16 16">
+                        <path
+                            d="M2.146 2.854a.5.5 0 1 1 .708-.708L8 7.293l5.146-5.147a.5.5 0 0 1 .708.708L8.707 8l5.147 5.146a.5.5 0 0 1-.708.708L8 8.707l-5.146 5.147a.5.5 0 0 1-.708-.708L7.293 8z" />
+                    </svg>
+                </button>
+            </div>
         </div>
         <span id="dot" class="position-absolute p-0 m-0 d-none">
-            <svg xmlns="http://www.w3.org/2000/svg" width="{{ dot_size }}"
-                height="{{ dot_size }}" viewBox="0 0 32 32" id="dotSVG">
+            <svg xmlns="http://www.w3.org/2000/svg" width="{{ dot_size }}" height="{{ dot_size }}" viewBox="0 0 32 32"
+                id="dotSVG">
                 <circle cx="16" cy="16" r="4" fill="black" />
             </svg>
         </span>
-        <div id="coords" class="border border-black position-absolute d-none bg-warning-subtle px-1 py-0 user-select-none"></div>
+        <div id="coords"
+            class="border border-black position-absolute d-none bg-warning-subtle px-1 py-0 user-select-none"></div>
         <canvas id="overlay" class="w-100 h-100"></canvas>
     </div>
 </div>
 {% endblock %}
 
 {% block script %}
-    const canvasEl = document.getElementById('overlay');
-    const colorEl = document.getElementById('color');
-    const coordsEl = document.getElementById('coords');
-    const dotEl = document.getElementById('dot');
-    const dotSVGEl = document.getElementById('dotSVG');
-    const gridEl = document.getElementById('grid');
+const canvasEl = document.getElementById('overlay');
+const clearEl = document.getElementById('clear');
+const colorEl = document.getElementById('color');
+const coordsEl = document.getElementById('coords');
+const dotEl = document.getElementById('dot');
+const dotSVGEl = document.getElementById('dotSVG');
+const exportEl = document.getElementById('export');
+const gridEl = document.getElementById('grid');
 
-    let ctx;
-    let dpr = 1;
-    let selectedColor = '#000000';
+let ctx;
+let dpr = 1;
+let selectedColor;
 
-    let currentShape = null;
-    let shapes = [];
+let currentShape = null;
+let shapes = JSON.parse(localStorage.getItem('gridShapes')) || [];
 
-    resizeAndSetupCanvas();
-    window.addEventListener('resize', resizeAndSetupCanvas);
+resizeAndSetupCanvas();
+window.addEventListener('resize', resizeAndSetupCanvas);
 
-    function getActiveTool() {
-        const checked = document.querySelector('input[name="tool"]:checked');
-        return checked ? checked.id : 'outline';
+function getActiveTool() {
+    const checked = document.querySelector('input[name="tool"]:checked');
+    return checked ? checked.id : 'outline';
+}
+
+function snapToGrid(x, y) {
+    const rect = gridEl.getBoundingClientRect();
+    const clampedX = Math.min(Math.max(x, rect.left), rect.right);
+    const clampedY = Math.min(Math.max(y, rect.top), rect.bottom);
+
+    const localX = clampedX - rect.left;
+    const localY = clampedY - rect.top;
+
+    const maxIx = Math.floor(rect.width / {{ grid_size }});
+    const maxIy = Math.floor(rect.height / {{ grid_size }});
+
+    const ix = Math.min(Math.max(Math.round(localX / {{ grid_size }}), 0), maxIx);
+    const iy = Math.min(Math.max(Math.round(localY / {{ grid_size }}), 0), maxIy);
+
+    return {
+        ix,
+        iy,
+        x: ix * {{ grid_size }},
+        y: iy * {{ grid_size }}
+    };
+}
+
+function normalizeRect(shape) {
+    const x = Math.min(shape.x1, shape.x2);
+    const y = Math.min(shape.y1, shape.y2);
+    const w = Math.abs(shape.x2 - shape.x1);
+    const h = Math.abs(shape.y2 - shape.y1);
+
+    return {
+        type: 'rect',
+        x,
+        y,
+        w,
+        h,
+        color: shape.color,
+        fill: shape.fill
+    };
+}
+
+function normalizeLine(shape) {
+    return {
+        type: 'line',
+        x1: shape.x1,
+        y1: shape.y1,
+        x2: shape.x2,
+        y2: shape.y2,
+        color: shape.color
+    };
+}
+
+function resizeAndSetupCanvas() {
+    dpr = window.devicePixelRatio || 1;
+    const rect = canvasEl.getBoundingClientRect();
+
+    canvasEl.width = rect.width * dpr;
+    canvasEl.height = rect.height * dpr;
+
+    ctx = canvasEl.getContext('2d');
+    ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
+
+    selectedColor = colorEl.value || '#000000';
+    const circle = dotSVGEl.querySelector('circle');
+    if (circle) {
+        circle.setAttribute('fill', selectedColor);
     }
 
-    function snapToGrid(x, y) {
-        const rect = gridEl.getBoundingClientRect();
-        const clampedX = Math.min(Math.max(x, rect.left), rect.right);
-        const clampedY = Math.min(Math.max(y, rect.top), rect.bottom);
+    redrawAll();
+}
 
-        const localX = clampedX - rect.left;
-        const localY = clampedY - rect.top;
+function redrawAll() {
+    if (!ctx) return;
 
-        const ix = Math.round(localX / {{ grid_size }});
-        const iy = Math.round(localY / {{ grid_size }});
-        return {
-            ix,
-            iy,
-            x: ix * {{ grid_size }},
-            y: iy * {{ grid_size }}
-        };
+    clearCanvas();
+    shapes.forEach(drawShape);
+}
+
+function drawShape(shape) {
+    if (!ctx) return;
+
+    ctx.save();
+    ctx.strokeStyle = shape.color || '#000000';
+
+    if (shape.type === 'rect') {
+        ctx.strokeRect(shape.x, shape.y, shape.w, shape.h);
+
+        if (shape.fill) {
+            ctx.globalAlpha = 0.15;
+            ctx.fillStyle = shape.color;
+            ctx.fillRect(shape.x, shape.y, shape.w, shape.h);
+            ctx.globalAlpha = 1;
+        }
+    } else if (shape.type === 'line') {
+        ctx.beginPath();
+        ctx.moveTo(shape.x1, shape.y1);
+        ctx.lineTo(shape.x2, shape.y2);
+        ctx.stroke();
     }
 
-    function normalizeRect(shape) {
-        const x = Math.min(shape.x1, shape.x2);
-        const y = Math.min(shape.y1, shape.y2);
-        const w = Math.abs(shape.x2 - shape.x1);
-        const h = Math.abs(shape.y2 - shape.y1);
+    ctx.restore();
+}
 
-        return {
-            type: 'rect',
-            x,
-            y,
-            w,
-            h,
-            color: shape.color,
-            fill: shape.fill
-        };
+function clearCanvas() {
+    if (!ctx) return;
+    const rect = canvasEl.getBoundingClientRect();
+    ctx.clearRect(0, 0, rect.width, rect.height);
+}
+
+exportEl.addEventListener('click', () => {
+    const blob = new Blob([JSON.stringify(shapes, null,2)], {type: 'application/json'});
+    const url = URL.createObjectURL(blob);
+    const a = document.createElement('a');
+    a.href = url;
+    a.download = 'grid-shapes.json';
+    a.click();
+    URL.revokeObjectURL(url);
+});
+
+clearEl.addEventListener('click', () => {
+    shapes = [];
+    localStorage.removeItem('gridShapes');
+    redrawAll();
+});
+
+colorEl.addEventListener('input', () => {
+    selectedColor = document.getElementById('color').value;
+    const circle = dotSVGEl.querySelector('circle');
+    if (circle) {
+        circle.setAttribute('fill', selectedColor);
+    }
+});
+
+document.addEventListener('keydown', (e) => {
+    const key = e.key.toLowerCase();
+
+    if ((e.ctrlKey || e.metaKey) && key === 'z') {
+        e.preventDefault();
+        if (shapes.length > 0) {
+            shapes.pop();
+            localStorage.setItem('gridShapes', JSON.stringify(shapes));
+            redrawAll();
+        }
     }
 
-    function resizeAndSetupCanvas() {
-        dpr = window.devicePixelRatio || 1;
-        const rect = canvasEl.getBoundingClientRect();
-
-        canvasEl.width = rect.width * dpr;
-        canvasEl.height = rect.height * dpr;
-
-        ctx = canvasEl.getContext('2d');
-        ctx.setTransform(dpr, 0, 0, dpr, 0, 0);
-
+    if (key === 'escape' && currentShape) {
+        currentShape = null;
         redrawAll();
     }
+});
 
-    function redrawAll() {
-        if (!ctx) return;
+gridEl.addEventListener('mousemove', (e) => {
+    const { ix, iy, x: snapX, y: snapY } = snapToGrid(e.clientX, e.clientY);
+
+    coordsEl.innerText = `(${ix}, ${iy})`;
+
+    const renderX = snapX - {{ dot_size }} / 2;
+    const renderY = snapY - {{ dot_size }} / 2;
+
+    coordsEl.classList.remove('d-none');
+
+    dotEl.classList.remove('d-none');
+    dotEl.style.top = `${renderY}px`;
+    dotEl.style.left = `${renderX}px`;
+
+    if (currentShape) {
+        const tool = currentShape.tool;
 
         clearCanvas();
         shapes.forEach(drawShape);
-    }
-
-    function drawShape(shape) {
-        if (!ctx) return;
 
         ctx.save();
-        ctx.strokeStyle = shape.color || '#000000';
-
-        if (shape.type === 'rect') {
-            ctx.strokeRect(shape.x, shape.y, shape.w, shape.h);
-
-            if (shape.fill) {
-                ctx.globalAlpha = 0.15;
-                ctx.fillStyle = shape.color;
-                ctx.fillRect(shape.x, shape.y, shape.w, shape.h);
-                ctx.globalAlpha = 1;
-            }
-        } else if ( shape.type === 'line' ) {
-            ctx.beginPath();
-            ctx.moveTo(shape.x1, shape.y1);
-            ctx.lineTo(shape.x2, shape.y2);
-            ctx.stroke();
-        }
-
-        ctx.restore();
-    }
-
-    function clearCanvas() {
-        ctx.clearRect(0, 0, canvasEl.width / dpr, canvasEl.height / dpr);
-    }
-
-    colorEl.addEventListener('input', () => {
-        selectedColor = document.getElementById('color').value;
-        const circle = dotSVGEl.querySelector('circle');
-        if (circle) {
-            circle.setAttribute('fill', selectedColor);
-        }
-    });
-
-    document.addEventListener('keydown', (e) => {
-        const key = e.key.toLowerCase();
-
-        if ((e.ctrlKey || e.metaKey) && key === 'z') {
-            e.preventDefault();
-            shapes.pop();
-            redrawAll();
-        }
-
-        if (key === 'escape' && currentShape) {
-            currentShape = null;
-            redrawAll();
-        }
-    });
-
-    gridEl.addEventListener('mousemove', (e) => {
-        const { ix, iy, x: snapX, y: snapY } = snapToGrid(e.clientX, e.clientY);
-
-        coordsEl.innerText = `(${ix}, ${iy})`;
-
-        const renderX = snapX - {{ dot_size }} / 2;
-        const renderY = snapY - {{ dot_size }} / 2;
-
-        coordsEl.classList.remove('d-none');
-
-        dotEl.classList.remove('d-none');
-        dotEl.style.top = `${renderY}px`;
-        dotEl.style.left = `${renderX}px`;
-
-        if (currentShape) {
-            const tool = currentShape.tool;
-
-            clearCanvas();
-            shapes.forEach(drawShape);
-
-            ctx.save();
-            ctx.setLineDash([5, 3]);
-
-            if (tool === 'line') {
-                const previewLine = {
-                    type: 'line',
-                    x1: currentShape.x1,
-                    y1: currentShape.y1,
-                    x2: snapX,
-                    y2: snapY,
-                    color: currentShape.color
-                };
-                drawShape(previewLine);
-            } else {
-                const previewRect = normalizeRect({
-                    ...currentShape,
-                    x2: snapX,
-                    y2: snapY
-                });
-                drawShape(previewRect);
-            }
-
-            ctx.setLineDash([]);
-            ctx.restore();
-        }
-    });
-
-    gridEl.addEventListener('mouseleave', (e) => {
-        coordsEl.classList.add('d-none');
-        dotEl.classList.add('d-none');
-    });
-
-    gridEl.addEventListener('mousedown', (e) => {
-        if (e.button !== 0) return;
-
-        e.preventDefault();
-
-        if (e.target.closest('#toolBar')) return;
-
-        const {x: snapX, y: snapY} = snapToGrid(e.clientX, e.clientY);
-        const tool = getActiveTool();
+        ctx.setLineDash([5, 3]);
 
         if (tool === 'line') {
-            currentShape = {
-                tool,
-                type: 'line',
-                x1: snapX,
-                y1: snapY,
-                x2: snapX,
-                y2: snapY,
-                color: selectedColor
-            };
-        } else {
-            currentShape = {
-                tool,
-                x1: snapX,
-                y1: snapY,
-                x2: snapX,
-                y2: snapY,
-                color: selectedColor,
-                fill: document.getElementById('filled').checked
-            };
-        }
-    });
-
-    window.addEventListener('mouseup', (e) => {
-        if (!currentShape) return;
-
-        const { x: snapX, y: snapY } = snapToGrid(e.clientX, e.clientY);
-
-        currentShape.x2 = snapX;
-        currentShape.y2 = snapY;
-
-        let finalShape = null;
-
-        if (currentShape.tool === 'line') {
-            finalShape = {
+            const previewLine = {
                 type: 'line',
                 x1: currentShape.x1,
                 y1: currentShape.y1,
-                x2: currentShape.x2,
-                y2: currentShape.y2,
+                x2: snapX,
+                y2: snapY,
                 color: currentShape.color
             };
+            drawShape(previewLine);
         } else {
-            const rect = normalizeRect(currentShape);
-
-            if (rect.w > 0 && rect.h > 0) {
-                finalShape = rect;
-            }
+            const previewRect = normalizeRect({
+                ...currentShape,
+                x2: snapX,
+                y2: snapY
+            });
+            drawShape(previewRect);
         }
 
-        if (finalShape) {
-            shapes.push(finalShape);
+        ctx.setLineDash([]);
+        ctx.restore();
+    }
+});
+
+gridEl.addEventListener('mouseleave', (e) => {
+    coordsEl.classList.add('d-none');
+    dotEl.classList.add('d-none');
+});
+
+gridEl.addEventListener('mousedown', (e) => {
+    if (e.button !== 0) return;
+
+    e.preventDefault();
+
+    if (e.target.closest('#toolBar')) return;
+
+    const { x: snapX, y: snapY } = snapToGrid(e.clientX, e.clientY);
+    const tool = getActiveTool();
+
+    if (tool === 'line') {
+        currentShape = {
+            tool,
+            type: 'line',
+            x1: snapX,
+            y1: snapY,
+            x2: snapX,
+            y2: snapY,
+            color: selectedColor
+        };
+    } else {
+        currentShape = {
+            tool,
+            x1: snapX,
+            y1: snapY,
+            x2: snapX,
+            y2: snapY,
+            color: selectedColor,
+            fill: document.getElementById('filled').checked
+        };
+    }
+});
+
+window.addEventListener('mouseup', (e) => {
+    if (!currentShape) return;
+
+    const { x: snapX, y: snapY } = snapToGrid(e.clientX, e.clientY);
+
+    currentShape.x2 = snapX;
+    currentShape.y2 = snapY;
+
+    let finalShape = null;
+
+    if (currentShape.tool === 'line') {
+        finalShape = normalizeLine(currentShape);
+    } else {
+        const rect = normalizeRect(currentShape);
+
+        if (rect.w > 0 && rect.h > 0) {
+            finalShape = rect;
         }
+    }
 
-        clearCanvas();
-        shapes.forEach(drawShape);
+    if (finalShape) {
+        shapes.push(finalShape);
+        localStorage.setItem('gridShapes', JSON.stringify(shapes));
+    }
 
-        currentShape = null;
-    });
+    clearCanvas();
+    shapes.forEach(drawShape);
+
+    currentShape = null;
+});
 {% endblock %}
\ No newline at end of file