Created
November 7, 2019 15:37
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| <!DOCTYPE html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <title>Ch14-exercise-The Cat's Hat</title> | |
| <style>body { min-height: 200px }</style> | |
| </head> | |
| <body> | |
| <img src="img/cat.png" id="cat" style="position: absolute"> | |
| <img src="img/hat.png" id="hat" style="position: absolute"> | |
| <script> | |
| let cat = document.querySelector("#cat"); | |
| let hat = document.querySelector("#hat"); | |
| let angle = 0; | |
| let lastTime = null; | |
| function animate(time) { | |
| if (lastTime != null) angle += (time - lastTime) * 0.001; | |
| lastTime = time; | |
| cat.style.top = (Math.sin(angle) * 40 + 40) + "px"; | |
| cat.style.left = (Math.cos(angle) * 200 + 230) + "px"; | |
| // Your extensions here. | |
| // Make the hat orbit at opposite sides of the ellipse. | |
| hat.style.top = (Math.sin(angle) * -40 + 40) + "px"; | |
| hat.style.left = (Math.cos(angle) * -200 + 230) + "px"; | |
| requestAnimationFrame(animate); | |
| } | |
| requestAnimationFrame(animate); | |
| </script> | |
| </body> | |
| </html> |
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