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annotate web/Light9CursorCanvas.ts @ 2450:a4052905ca7d default tip

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author drewp@bigasterisk.com
date Mon, 03 Jun 2024 23:01:54 -0700
parents e7e03c203c99
children
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1 import debug from "debug";
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2 import { css, html, LitElement, PropertyValues } from "lit";
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3 import { customElement, property } from "lit/decorators.js";
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4 import Sylvester from "sylvester";
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5 import { line } from "./drawing";
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6 import { Vector } from "./lib/sylvester";
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7
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8 const $V = Sylvester.Vector.create;
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9
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10 const log = debug("cursor");
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11
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12 export interface PlainViewState {
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13 zoomSpec: { t1: () => number; t2: () => number };
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14 fullZoomX: (t: number) => number;
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15 zoomInX: (t: number) => number;
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16 cursor: { t: () => number };
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17 audioY: () => number;
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18 audioH: () => number;
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19 zoomedTimeY: () => number; // not what you think- it's the zone in between
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20 zoomedTimeH: () => number;
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21 mouse: { pos: () => Vector };
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22 }
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23
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24 export interface PlainerViewState {
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25 zoomSpec: { t1: number; t2: number };
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26 fullZoomX: (t: number) => number;
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27 zoomInX: (t: number) => number;
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28 cursor: { t: number };
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29 audioY: number;
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30 audioH: number;
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31 zoomedTimeY: number; // not what you think- it's the zone in between
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32 zoomedTimeH: number;
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33 mouse: { pos: Vector };
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34 }
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35 // For cases where you have a zoomed-out view on top of a zoomed-in view,
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36 // overlay this element and it'll draw a time cursor on both views.
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37 @customElement("light9-cursor-canvas")
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38 export class Light9CursorCanvas extends LitElement {
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39 cursorPath: null | {
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40 top0: Vector;
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41 top1: Vector;
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42 mid0: Vector;
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43 mid1: Vector;
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44 mid2: Vector;
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45 mid3: Vector;
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46 bot0: Vector;
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47 bot1: Vector;
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48 } = null;
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49 canvasEl!: HTMLCanvasElement;
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50 ctx!: CanvasRenderingContext2D;
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51 offsetWidth: any;
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52 offsetHeight: any;
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53 @property() viewState: PlainerViewState | null = null;
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54 static styles = [
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55 css`
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56 :host {
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57 display: inline-block;
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58 }
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59 canvas {
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60 width: 100%;
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61 height: 100%;
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62
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63 }
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64 `,
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65 ];
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66 resizeObserver!: ResizeObserver;
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67 render() {
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68 return html`<canvas></canvas>`;
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69 }
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70
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71 updated(changedProperties: PropertyValues) {
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72 if (changedProperties.has("viewState")) {
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73 this.redrawCursor();
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74 }
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75 }
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76 connectedCallback() {
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77 super.connectedCallback();
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78 this.resizeObserver = new ResizeObserver(this.onResize.bind(this));
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79 this.resizeObserver.observe(this);
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80 }
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81
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82 firstUpdated() {
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83 this.canvasEl = this.shadowRoot!.firstElementChild as HTMLCanvasElement;
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84 this.ctx = this.canvasEl.getContext("2d")!;
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85 }
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86
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87 disconnectedCallback() {
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88 this.resizeObserver.unobserve(this);
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89 }
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90
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91 onResize() {
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92 log('onResize', this.clientWidth, this.clientHeight);
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93 if (!this.canvasEl) {
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94 return;
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95 }
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96 this.canvasEl.width = this.clientWidth;
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97 this.canvasEl.height = this.clientHeight;
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98 this.redrawCursor();
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99 }
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100
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101 redrawCursor() {
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102 const vs = this.viewState;
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103 if (!vs) {
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104 return;
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105 }
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106 const xZoomedOut = vs.fullZoomX(vs.cursor.t);
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107 const xZoomedIn = vs.zoomInX(vs.cursor.t);
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108
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109 this.cursorPath = {
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110 top0: $V([xZoomedOut, vs.audioY]),
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111 top1: $V([xZoomedOut, vs.audioY + vs.audioH]),
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112 mid0: $V([xZoomedIn + 2, vs.zoomedTimeY + vs.zoomedTimeH]),
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113 mid1: $V([xZoomedIn - 2, vs.zoomedTimeY + vs.zoomedTimeH]),
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114 mid2: $V([xZoomedOut - 1, vs.audioY + vs.audioH]),
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115 mid3: $V([xZoomedOut + 1, vs.audioY + vs.audioH]),
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116 bot0: $V([xZoomedIn, vs.zoomedTimeY + vs.zoomedTimeH]),
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117 bot1: $V([xZoomedIn, this.offsetHeight]),
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118 };
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119 this.redraw();
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120 }
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121
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122 redraw() {
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123 if (!this.ctx || !this.viewState) {
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124 return;
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125 }
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126 this.ctx.clearRect(0, 0, this.canvasEl.width, this.canvasEl.height);
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127
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128 this.ctx.strokeStyle = "#fff";
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129 this.ctx.lineWidth = 0.5;
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130 this.ctx.beginPath();
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131 const mouse = this.viewState.mouse.pos;
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132 line(this.ctx, $V([0, mouse.e(2)]), $V([this.canvasEl.width, mouse.e(2)]));
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133 line(this.ctx, $V([mouse.e(1), 0]), $V([mouse.e(1), this.canvasEl.height]));
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134 this.ctx.stroke();
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135
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136 if (this.cursorPath) {
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137 this.ctx.strokeStyle = "#ff0303";
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138 this.ctx.lineWidth = 1.5;
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139 this.ctx.beginPath();
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140 line(this.ctx, this.cursorPath.top0, this.cursorPath.top1);
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141 this.ctx.stroke();
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142
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143 this.ctx.fillStyle = "#9c0303";
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144 this.ctx.beginPath();
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145 this.ctx.moveTo(this.cursorPath.mid0.e(1), this.cursorPath.mid0.e(2));
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146 for (let p of [this.cursorPath.mid1, this.cursorPath.mid2, this.cursorPath.mid3]) {
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147 this.ctx.lineTo(p.e(1), p.e(2));
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148 }
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149 this.ctx.fill();
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150
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151 this.ctx.strokeStyle = "#ff0303";
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152 this.ctx.lineWidth = 3;
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153 this.ctx.beginPath();
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154 line(this.ctx, this.cursorPath.bot0, this.cursorPath.bot1, "#ff0303", "3px");
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155 this.ctx.stroke();
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156 }
e2ed5ce36253 double spectrum views have a connected cursor
drewp@bigasterisk.com
parents: 1734
diff changeset
157 }
e2ed5ce36253 double spectrum views have a connected cursor
drewp@bigasterisk.com
parents: 1734
diff changeset
158 }