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| 1 | +<!doctype html> |
| 2 | +<html lang="fr"> |
| 3 | + <head> |
| 4 | + <meta charset="utf-8" /> |
| 5 | + <meta name="viewport" content="width=device-width, initial-scale=1" /> |
| 6 | + <title>Rectangles (écrans) sur canvas</title> |
| 7 | + <style> |
| 8 | + html, body { height: 100%; margin: 0; } |
| 9 | + canvas { display: block; background: #0b0d10; } |
| 10 | + </style> |
| 11 | + </head> |
| 12 | + <body> |
| 13 | + <canvas id="c"></canvas> |
| 14 | + |
| 15 | + <script> |
| 16 | + const canvas = document.getElementById("c"); |
| 17 | + const ctx = canvas.getContext("2d"); |
| 18 | + |
| 19 | + function resize() { |
| 20 | + canvas.width = window.innerWidth; |
| 21 | + canvas.height = window.innerHeight; |
| 22 | + draw(); |
| 23 | + } |
| 24 | + window.addEventListener("resize", resize); |
| 25 | + |
| 26 | + // 3 rectangles "écrans" en coordonnées globales |
| 27 | + // (x, y, w, h) |
| 28 | + const outputs = [ |
| 29 | + { x: 0, y: 0, w: 480, h: 240 }, // écran 1 |
| 30 | + { x: 480, y: 48, w: 480, h: 240 }, // écran 2 (collé à droite) |
| 31 | + { x: 960, y: 0, w: 480, h: 240 }, // écran 3 (collé en bas de l'écran 2) |
| 32 | + ]; |
| 33 | + |
| 34 | + function drawGrid(step = 16) { |
| 35 | + ctx.save(); |
| 36 | + ctx.globalAlpha = 0.25; |
| 37 | + ctx.strokeStyle = "#2b2f36"; |
| 38 | + ctx.lineWidth = 1; |
| 39 | + |
| 40 | + for (let x = 0; x <= canvas.width; x += step) { |
| 41 | + ctx.beginPath(); |
| 42 | + ctx.moveTo(x, 0); |
| 43 | + ctx.lineTo(x, canvas.height); |
| 44 | + ctx.stroke(); |
| 45 | + } |
| 46 | + for (let y = 0; y <= canvas.height; y += step) { |
| 47 | + ctx.beginPath(); |
| 48 | + ctx.moveTo(0, y); |
| 49 | + ctx.lineTo(canvas.width, y); |
| 50 | + ctx.stroke(); |
| 51 | + } |
| 52 | + ctx.restore(); |
| 53 | + } |
| 54 | + |
| 55 | + function draw() { |
| 56 | + ctx.clearRect(0, 0, canvas.width, canvas.height); |
| 57 | + drawGrid(16); |
| 58 | + |
| 59 | + // Dessin des rectangles |
| 60 | + ctx.font = "14px system-ui, sans-serif"; |
| 61 | + outputs.forEach((r, i) => { |
| 62 | + // remplissage |
| 63 | + ctx.fillStyle = "rgba(80, 160, 255, 0.18)"; |
| 64 | + ctx.fillRect(r.x, r.y, r.w, r.h); |
| 65 | + |
| 66 | + // bordure |
| 67 | + ctx.strokeStyle = "#a8c7ff"; |
| 68 | + ctx.lineWidth = 2; |
| 69 | + ctx.strokeRect(r.x, r.y, r.w, r.h); |
| 70 | + |
| 71 | + // label |
| 72 | + ctx.fillStyle = "#e8eefc"; |
| 73 | + ctx.fillText( |
| 74 | + `Output ${i + 1} (${r.x},${r.y}) ${r.w}x${r.h}`, |
| 75 | + r.x + 10, |
| 76 | + r.y + 22 |
| 77 | + ); |
| 78 | + }); |
| 79 | + } |
| 80 | + |
| 81 | + resize(); |
| 82 | + </script> |
| 83 | + </body> |
| 84 | +</html> |
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