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July 26, 2020 13:29
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| <!DOCTYPE html> | |
| <!-- ref: https://jsbin.com/woquxetufe/edit?html,js,output --> | |
| <html> | |
| <head> | |
| <meta charset="utf-8"> | |
| <meta name="viewport" content="width=device-width"> | |
| <title>JS Bin</title> | |
| </head> | |
| <body> | |
| <svg> | |
| <path id="arc1" fill="none" stroke="#446688" stroke-width="20" /> | |
| <path id="arc2" fill="none" stroke="red" stroke-width="20" /> | |
| </svg> | |
| <script> | |
| function polarToCartesian(centerX, centerY, radius, angleInDegrees) { | |
| var angleInRadians = (angleInDegrees-90) * Math.PI / 180.0; | |
| return { | |
| x: centerX + (radius * Math.cos(angleInRadians)), | |
| y: centerY + (radius * Math.sin(angleInRadians)) | |
| }; | |
| } | |
| function describeArc(x, y, radius, startAngle, endAngle){ | |
| var start = polarToCartesian(x, y, radius, endAngle); | |
| var end = polarToCartesian(x, y, radius, startAngle); | |
| var largeArcFlag = endAngle - startAngle <= 180 ? "0" : "1"; | |
| var d = [ | |
| "M", start.x, start.y, | |
| "A", radius, radius, 0, largeArcFlag, 0, end.x, end.y | |
| ].join(" "); | |
| return d; | |
| } | |
| window.onload = function() { | |
| document.getElementById("arc1").setAttribute("d", describeArc(170, 170, 100, 0, 90)); | |
| document.getElementById("arc2").setAttribute("d", describeArc(170, 170, 100, 90, 120)); | |
| }; | |
| </script> | |
| </body> | |
| </html> |
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