@cyberian said in CS420 Assignment 2 Solution and Discussion: You are required to develop an HTML5 based webpage which draws an Animated Solar System (i.e. moon revolves around earth and earth revolves around the sun) on canvas. Here is a screenshot of a sample page. Your Task is to make such a page suitable for portable devices. You can use concepts of HTML5, CSS and JavaScript etc. <!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <title>CS420 - Assignment # 2</title> </head> <body> <canvas id="canvas" width="1000" height="1000"></canvas> <script> var sun = new Image(); var moon = new Image(); var earth = new Image(); function init() { sun.src = 'images/canvas_sun.png'; moon.src = 'images/canvas_moon.png'; earth.src = 'images/canvas_earth.png'; window.requestAnimationFrame(draw); } function draw() { var ctx = document.getElementById('canvas').getContext('2d'); ctx.globalCompositeOperation = 'destination-over'; ctx.clearRect(0, 0, 800, 800); // clear canvas ctx.fillStyle = 'rgba(0, 0, 0, 0.4)'; ctx.strokeStyle = 'rgba(0, 153, 255, 0.4)'; ctx.save(); ctx.translate(400, 400); // Earth var time = new Date(); ctx.rotate(((2 * Math.PI) / 60) * time.getSeconds() + ((2 * Math.PI) / 60000) * time.getMilliseconds()); ctx.translate(205, 0); ctx.fillRect(0, -12, 40, 24); // Shadow ctx.drawImage(earth, -12, -12); // Moon ctx.save(); ctx.rotate(((2 * Math.PI) / 6) * time.getSeconds() + ((2 * Math.PI) / 6000) * time.getMilliseconds()); ctx.translate(0, 28.5); ctx.drawImage(moon, -3.5, -3.5); ctx.restore(); ctx.restore(); ctx.beginPath(); ctx.arc(400, 400, 205, 0, Math.PI * 2, false); // Earth orbit ctx.stroke(); ctx.drawImage(sun, 0, 0, 800, 800); window.requestAnimationFrame(draw); } init(); </script> </body> </html> images folder images: