* @typedef { import('../core/core.controller.js').default } Chart
(rotation, circumference, cutout)
| 8 | */ |
| 9 | |
| 10 | function getRatioAndOffset(rotation, circumference, cutout) { |
| 11 | let ratioX = 1; |
| 12 | let ratioY = 1; |
| 13 | let offsetX = 0; |
| 14 | let offsetY = 0; |
| 15 | // If the chart's circumference isn't a full circle, calculate size as a ratio of the width/height of the arc |
| 16 | if (circumference < TAU) { |
| 17 | const startAngle = rotation; |
| 18 | const endAngle = startAngle + circumference; |
| 19 | const startX = Math.cos(startAngle); |
| 20 | const startY = Math.sin(startAngle); |
| 21 | const endX = Math.cos(endAngle); |
| 22 | const endY = Math.sin(endAngle); |
| 23 | const calcMax = (angle, a, b) => _angleBetween(angle, startAngle, endAngle, true) ? 1 : Math.max(a, a * cutout, b, b * cutout); |
| 24 | const calcMin = (angle, a, b) => _angleBetween(angle, startAngle, endAngle, true) ? -1 : Math.min(a, a * cutout, b, b * cutout); |
| 25 | const maxX = calcMax(0, startX, endX); |
| 26 | const maxY = calcMax(HALF_PI, startY, endY); |
| 27 | const minX = calcMin(PI, startX, endX); |
| 28 | const minY = calcMin(PI + HALF_PI, startY, endY); |
| 29 | ratioX = (maxX - minX) / 2; |
| 30 | ratioY = (maxY - minY) / 2; |
| 31 | offsetX = -(maxX + minX) / 2; |
| 32 | offsetY = -(maxY + minY) / 2; |
| 33 | } |
| 34 | return {ratioX, ratioY, offsetX, offsetY}; |
| 35 | } |
| 36 | |
| 37 | export default class DoughnutController extends DatasetController { |
| 38 |