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Light spectrum displayed with HTML 5 canvas gradient
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| <html> | |
| <body> | |
| <canvas id="light-spectrum" width="600" height="300"></canvas> | |
| <script> | |
| /* | |
| * deep-violet | 380 | 0 | |
| * violet | 400 | 0.05 | |
| * blue | 450 | 0.175 | |
| * cyan | 450 | 0.2125 | |
| * green | 450 | 0.35 | |
| * yellow | 450 | 0.4625 | |
| * red | 650 | 0.675 | |
| * deep-red | 780 | 0.1 | |
| */ | |
| var canvas = document.getElementById("light-spectrum"); | |
| var plane = canvas.getContext("2d"); | |
| var gradient = plane.createLinearGradient(0, 0, 600, 0); | |
| gradient.addColorStop(0, 'rgba(128,0,128,1)'); | |
| gradient.addColorStop(0.05, 'rgba(255,0,255,1)'); | |
| gradient.addColorStop(0.175, 'rgba(0,0,255,1)'); | |
| gradient.addColorStop(0.2125, 'rgba(0,255,255,1)'); | |
| gradient.addColorStop(0.35, 'rgba(0,255,0,1)'); | |
| gradient.addColorStop(0.4625, 'rgba(255,255,0,1)'); | |
| gradient.addColorStop(0.675, 'rgba(255,0,0,1)'); | |
| gradient.addColorStop(1, 'rgba(128,0,0,1)'); | |
| plane.fillStyle = gradient; | |
| plane.fillRect(0, 0, 600, 300); | |
| </script> | |
| </body> | |
| </html> |
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