corsair_plugin.js
90 lines
| 1 | module.exports = { |
| 2 | id: 'corsair', |
| 3 | beforeInit: (chart, _, opts) => { |
| 4 | if (opts.disabled) { |
| 5 | return; |
| 6 | } |
| 7 | chart.corsair = { |
| 8 | x: 0, |
| 9 | y: 0 |
| 10 | } |
| 11 | }, |
| 12 | afterEvent: (chart, evt, opts) => { |
| 13 | if (opts.disabled) { |
| 14 | return; |
| 15 | } |
| 16 | const { |
| 17 | chartArea: { |
| 18 | top, |
| 19 | bottom, |
| 20 | left, |
| 21 | right |
| 22 | } |
| 23 | } = chart; |
| 24 | const { |
| 25 | event: { |
| 26 | x, |
| 27 | y |
| 28 | } |
| 29 | } = evt; |
| 30 | if (x < left || x > right || y < top || y > bottom) { |
| 31 | chart.corsair = { |
| 32 | x, |
| 33 | y, |
| 34 | draw: false |
| 35 | } |
| 36 | chart.draw(); |
| 37 | return; |
| 38 | } |
| 39 | |
| 40 | chart.corsair = { |
| 41 | x, |
| 42 | y, |
| 43 | draw: true |
| 44 | } |
| 45 | |
| 46 | chart.draw(); |
| 47 | }, |
| 48 | afterDatasetsDraw: (chart, _, opts) => { |
| 49 | if (opts.disabled) { |
| 50 | return; |
| 51 | } |
| 52 | const { |
| 53 | ctx, |
| 54 | chartArea: { |
| 55 | top, |
| 56 | bottom, |
| 57 | left, |
| 58 | right |
| 59 | } |
| 60 | } = chart; |
| 61 | let { |
| 62 | x, |
| 63 | y, |
| 64 | draw |
| 65 | } = chart.corsair; |
| 66 | |
| 67 | if (!draw) { |
| 68 | return; |
| 69 | } |
| 70 | |
| 71 | // console.log(chart); |
| 72 | x = chart.tooltip.caretX; |
| 73 | |
| 74 | ctx.lineWidth = opts.width || 0; |
| 75 | // // Todo - Why does dash fuck up dots? |
| 76 | ctx.setLineDash(opts.dash || []); |
| 77 | ctx.strokeStyle = opts.color || 'black' |
| 78 | |
| 79 | ctx.save(); |
| 80 | ctx.beginPath(); |
| 81 | ctx.moveTo(x, bottom); |
| 82 | ctx.lineTo(x, top); |
| 83 | // Uncomment these 2 lines to add horizontal line |
| 84 | // ctx.moveTo(left, y); |
| 85 | // ctx.lineTo(right, y); |
| 86 | ctx.stroke(); |
| 87 | ctx.restore(); |
| 88 | ctx.setLineDash([]); |
| 89 | } |
| 90 | } |