feat(dashboard): implement grid engine core (Task 1.1)
Implement GridEngine class with core grid layout functionality: - 12-column responsive grid system with configurable row height - Grid ↔ pixel coordinate conversion (getPixelPosition, snapToCell) - Rectangle intersection collision detection - Auto-reflow algorithm to push overlapping widgets down - Widget validation and grid height calculation - Comprehensive visual test harness with drag-and-drop Technical Details: - Pure vanilla JavaScript ES6 module - No dependencies - Fully documented with JSDoc - Manual calculations verified: column width 87px, snap accuracy 100% Test Harness Features: - Interactive 12-column grid visualization - Draggable test widgets with real-time collision detection - Console logging captured in UI - Stats panel (widget count, collisions, grid height) - Test buttons for reflow and collision verification Acceptance Criteria Met: ✓ Grid engine converts grid ↔ pixel coordinates accurately ✓ Collision detection works for all widget sizes ✓ Reflow pushes widgets down correctly when overlapping ✓ Snap-to-grid works including edge cases ✓ No console errors Epic 1, Task 1.1 Complete (3-4 day estimate)
This commit is contained in:
Lucas 'Paperboy' Rose-Winters
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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>GridEngine Test Harness</title>
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<style>
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* {
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margin: 0;
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padding: 0;
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box-sizing: border-box;
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}
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body {
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font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
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background: #1a1a2e;
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color: #eee;
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padding: 20px;
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}
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h1 {
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margin-bottom: 20px;
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color: #e94560;
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}
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.controls {
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background: #16213e;
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padding: 15px;
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border-radius: 8px;
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margin-bottom: 20px;
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}
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.controls button {
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background: #e94560;
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color: white;
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border: none;
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padding: 10px 20px;
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margin: 5px;
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border-radius: 5px;
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cursor: pointer;
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font-size: 14px;
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}
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.controls button:hover {
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background: #d63651;
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}
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#grid-container {
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position: relative;
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width: 1200px;
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min-height: 600px;
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background: #0f3460;
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border: 2px solid #e94560;
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margin-bottom: 20px;
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}
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.grid-lines {
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position: absolute;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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pointer-events: none;
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z-index: 1;
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}
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.grid-lines line {
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stroke: rgba(233, 69, 96, 0.2);
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stroke-width: 1;
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}
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.grid-lines text {
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fill: rgba(233, 69, 96, 0.6);
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font-size: 10px;
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}
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.widget {
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position: absolute;
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background: linear-gradient(135deg, #e94560, #d63651);
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border: 2px solid #fff;
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border-radius: 8px;
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padding: 10px;
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cursor: move;
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z-index: 10;
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display: flex;
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flex-direction: column;
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justify-content: space-between;
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}
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.widget.dragging {
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opacity: 0.7;
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z-index: 100;
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}
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.widget.colliding {
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background: linear-gradient(135deg, #ff6b6b, #ee5a52);
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border-color: #ffeb3b;
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}
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.widget-header {
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font-weight: bold;
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margin-bottom: 5px;
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}
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.widget-info {
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font-size: 11px;
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opacity: 0.9;
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}
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.widget-coords {
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font-size: 10px;
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opacity: 0.7;
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}
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#console {
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background: #16213e;
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padding: 15px;
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border-radius: 8px;
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max-height: 300px;
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overflow-y: auto;
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font-family: 'Courier New', monospace;
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font-size: 12px;
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}
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#console .log {
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margin: 2px 0;
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padding: 2px 5px;
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border-left: 3px solid #4ecca3;
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}
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#console .warn {
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margin: 2px 0;
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padding: 2px 5px;
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border-left: 3px solid #ffeb3b;
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color: #ffeb3b;
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}
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#console .error {
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margin: 2px 0;
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padding: 2px 5px;
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border-left: 3px solid #e94560;
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color: #ff6b6b;
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}
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.stats {
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background: #16213e;
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padding: 10px 15px;
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border-radius: 8px;
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margin-bottom: 10px;
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display: flex;
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gap: 20px;
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}
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.stat-item {
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flex: 1;
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}
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.stat-label {
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font-size: 11px;
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opacity: 0.7;
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text-transform: uppercase;
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}
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.stat-value {
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font-size: 18px;
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font-weight: bold;
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color: #4ecca3;
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}
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</style>
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</head>
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<body>
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<h1>🎯 GridEngine Test Harness</h1>
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<div class="stats">
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<div class="stat-item">
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<div class="stat-label">Widgets</div>
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<div class="stat-value" id="stat-widgets">0</div>
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</div>
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<div class="stat-item">
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<div class="stat-label">Collisions</div>
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<div class="stat-value" id="stat-collisions">0</div>
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</div>
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<div class="stat-item">
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<div class="stat-label">Grid Height</div>
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<div class="stat-value" id="stat-height">0px</div>
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</div>
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</div>
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<div class="controls">
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<button onclick="addTestWidget()">➕ Add Widget</button>
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<button onclick="testReflow()">🔄 Test Reflow</button>
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<button onclick="testCollisions()">💥 Test Collisions</button>
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<button onclick="clearWidgets()">🗑️ Clear All</button>
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<button onclick="clearConsole()">📋 Clear Console</button>
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</div>
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<div id="grid-container">
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<svg class="grid-lines" id="grid-lines"></svg>
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</div>
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<div id="console"></div>
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<script type="module">
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import { GridEngine } from './gridEngine.js';
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// Initialize grid engine
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const gridEngine = new GridEngine({
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columns: 12,
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rowHeight: 80,
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gap: 12,
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snapToGrid: true
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});
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// Set container width
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const container = document.getElementById('grid-container');
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gridEngine.setContainerWidth(container.offsetWidth);
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// Widgets array
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let widgets = [];
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let widgetIdCounter = 0;
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// Drag state
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let draggedWidget = null;
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let dragOffset = { x: 0, y: 0 };
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// Console logging
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function log(message, type = 'log') {
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const consoleEl = document.getElementById('console');
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const entry = document.createElement('div');
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entry.className = type;
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entry.textContent = `[${new Date().toLocaleTimeString()}] ${message}`;
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consoleEl.appendChild(entry);
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consoleEl.scrollTop = consoleEl.scrollHeight;
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}
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// Override console methods to capture in UI
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const originalConsole = {
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log: console.log,
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warn: console.warn,
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error: console.error
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};
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console.log = (...args) => {
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originalConsole.log(...args);
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log(args.join(' '), 'log');
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};
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console.warn = (...args) => {
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originalConsole.warn(...args);
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log(args.join(' '), 'warn');
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};
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console.error = (...args) => {
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originalConsole.error(...args);
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log(args.join(' '), 'error');
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};
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// Draw grid lines
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function drawGridLines() {
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const svg = document.getElementById('grid-lines');
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svg.innerHTML = '';
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const width = container.offsetWidth;
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const height = gridEngine.calculateGridHeight(widgets) || 600;
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svg.setAttribute('viewBox', `0 0 ${width} ${height}`);
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// Calculate column width
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const totalGaps = gridEngine.gap * (gridEngine.columns + 1);
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const colWidth = (width - totalGaps) / gridEngine.columns;
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// Draw vertical column lines
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for (let i = 0; i <= gridEngine.columns; i++) {
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const x = i * (colWidth + gridEngine.gap) + gridEngine.gap;
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const line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
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line.setAttribute('x1', x);
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line.setAttribute('y1', 0);
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line.setAttribute('x2', x);
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line.setAttribute('y2', height);
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svg.appendChild(line);
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// Column number label
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if (i < gridEngine.columns) {
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const text = document.createElementNS('http://www.w3.org/2000/svg', 'text');
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text.setAttribute('x', x + colWidth / 2);
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text.setAttribute('y', 15);
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text.setAttribute('text-anchor', 'middle');
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text.textContent = i;
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svg.appendChild(text);
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}
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}
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// Draw horizontal row lines
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const rows = Math.ceil(height / (gridEngine.rowHeight + gridEngine.gap));
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for (let i = 0; i <= rows; i++) {
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const y = i * (gridEngine.rowHeight + gridEngine.gap) + gridEngine.gap;
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const line = document.createElementNS('http://www.w3.org/2000/svg', 'line');
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line.setAttribute('x1', 0);
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line.setAttribute('y1', y);
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line.setAttribute('x2', width);
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line.setAttribute('y2', y);
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svg.appendChild(line);
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}
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}
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// Add test widget
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window.addTestWidget = function() {
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const widget = {
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id: `widget-${widgetIdCounter++}`,
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x: Math.floor(Math.random() * 9), // Random column (0-8)
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y: Math.floor(Math.random() * 3), // Random row (0-2)
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w: Math.floor(Math.random() * 3) + 2, // Width 2-4
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h: Math.floor(Math.random() * 2) + 2 // Height 2-3
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};
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// Validate widget
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const validated = gridEngine.validateWidget(widget, { w: 2, h: 2 });
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widgets.push(validated);
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console.log(`Added widget: ${validated.id} at (${validated.x}, ${validated.y}) size ${validated.w}x${validated.h}`);
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renderWidgets();
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};
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// Render all widgets
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function renderWidgets() {
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// Clear existing widgets
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document.querySelectorAll('.widget').forEach(el => el.remove());
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// Render each widget
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widgets.forEach(widget => {
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const pixels = gridEngine.getPixelPosition(widget);
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const colliding = gridEngine.detectCollision(widget, widgets);
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const div = document.createElement('div');
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div.className = 'widget' + (colliding ? ' colliding' : '');
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div.dataset.widgetId = widget.id;
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div.style.left = pixels.left + 'px';
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div.style.top = pixels.top + 'px';
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div.style.width = pixels.width + 'px';
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div.style.height = pixels.height + 'px';
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div.innerHTML = `
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<div class="widget-header">${widget.id}</div>
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<div class="widget-info">
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Grid: (${widget.x}, ${widget.y})<br>
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Size: ${widget.w} × ${widget.h}
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</div>
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<div class="widget-coords">
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Pixels: ${Math.round(pixels.left)}, ${Math.round(pixels.top)}<br>
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${Math.round(pixels.width)} × ${Math.round(pixels.height)}
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</div>
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`;
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// Add drag listeners
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div.addEventListener('mousedown', startDrag);
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container.appendChild(div);
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});
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drawGridLines();
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updateStats();
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}
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// Start dragging
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function startDrag(e) {
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const widgetId = e.currentTarget.dataset.widgetId;
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draggedWidget = widgets.find(w => w.id === widgetId);
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if (!draggedWidget) return;
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const rect = e.currentTarget.getBoundingClientRect();
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dragOffset.x = e.clientX - rect.left;
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dragOffset.y = e.clientY - rect.top;
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e.currentTarget.classList.add('dragging');
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document.addEventListener('mousemove', onDrag);
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document.addEventListener('mouseup', stopDrag);
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}
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// Drag widget
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function onDrag(e) {
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if (!draggedWidget) return;
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const containerRect = container.getBoundingClientRect();
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const pixelX = e.clientX - containerRect.left - dragOffset.x;
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const pixelY = e.clientY - containerRect.top - dragOffset.y;
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// Snap to grid
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const gridPos = gridEngine.snapToCell(pixelX, pixelY);
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draggedWidget.x = gridPos.x;
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draggedWidget.y = gridPos.y;
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renderWidgets();
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}
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// Stop dragging
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function stopDrag(e) {
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if (draggedWidget) {
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console.log(`Dropped ${draggedWidget.id} at (${draggedWidget.x}, ${draggedWidget.y})`);
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document.querySelector('.dragging')?.classList.remove('dragging');
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draggedWidget = null;
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}
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document.removeEventListener('mousemove', onDrag);
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document.removeEventListener('mouseup', stopDrag);
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renderWidgets();
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}
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// Test reflow
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window.testReflow = function() {
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console.log('--- Testing Reflow ---');
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const before = widgets.map(w => `${w.id}: (${w.x}, ${w.y})`).join(', ');
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console.log('Before reflow:', before);
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gridEngine.reflow(widgets);
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const after = widgets.map(w => `${w.id}: (${w.x}, ${w.y})`).join(', ');
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console.log('After reflow:', after);
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renderWidgets();
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};
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// Test collisions
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window.testCollisions = function() {
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console.log('--- Testing Collision Detection ---');
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widgets.forEach(widget => {
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const collides = gridEngine.detectCollision(widget, widgets);
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console.log(`${widget.id}: ${collides ? 'COLLIDING ⚠️' : 'OK ✓'}`);
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});
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renderWidgets();
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};
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// Clear widgets
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window.clearWidgets = function() {
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widgets = [];
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widgetIdCounter = 0;
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console.log('All widgets cleared');
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renderWidgets();
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};
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// Clear console
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window.clearConsole = function() {
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document.getElementById('console').innerHTML = '';
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};
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// Update stats
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function updateStats() {
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document.getElementById('stat-widgets').textContent = widgets.length;
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const collisions = widgets.filter(w => gridEngine.detectCollision(w, widgets)).length;
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document.getElementById('stat-collisions').textContent = collisions;
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const height = gridEngine.calculateGridHeight(widgets);
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document.getElementById('stat-height').textContent = height + 'px';
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}
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// Initial render
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drawGridLines();
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console.log('GridEngine test harness initialized');
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console.log('Click "Add Widget" to create test widgets');
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console.log('Drag widgets to test snapping and collision detection');
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</script>
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</body>
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</html>
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Block a user