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[VTK] Add colorbar on vtk renderer (#1270)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,118 @@ | ||
| import {ColorMapper, ContinuousColorMapper, LinearColorMapper} from "@bokehjs/models/mappers" | ||
| import {range, linspace} from "@bokehjs/core/util/array" | ||
|
|
||
| export declare type ColorBarOptions = { | ||
| ticksNum?: number | ||
| ticksSize?: number | ||
| fontFamily?: string | ||
| fontSize?: string | ||
| height?: string | ||
| } | ||
|
|
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| export class VTKColorBar { | ||
| public canvas: HTMLCanvasElement | ||
| private ctx: CanvasRenderingContext2D | ||
|
|
||
| constructor( | ||
| private parent: HTMLElement, | ||
| private mapper: ColorMapper, | ||
| private options: ColorBarOptions = {} | ||
| ) { | ||
| if (!options.ticksNum) options.ticksNum = 5 | ||
| if (!options.fontFamily) options.fontFamily = "Arial" | ||
| if (!options.fontSize) options.fontSize = "12px" | ||
| if (!options.ticksSize) options.ticksSize = 2 | ||
| this.canvas = document.createElement("canvas") | ||
| this.canvas.style.width = "100%" | ||
| this.parent.appendChild(this.canvas) | ||
| this.ctx = this.canvas.getContext("2d")! | ||
| this.ctx.font = `${this.options.fontSize} ${this.options.fontFamily}` | ||
| this.ctx.lineWidth = options.ticksSize | ||
| if (!options.height) | ||
| options.height = `${(this.font_height+1) * 4}px` //title/ticks/colorbar | ||
| this.canvas.style.height = options.height | ||
| this.draw_colorbar() | ||
| } | ||
|
|
||
| get values(): number[] { | ||
| const {high, low} = this.mapper as ContinuousColorMapper | ||
| return linspace(low, high, this.options.ticksNum!) | ||
| } | ||
|
|
||
| get ticks(): string[] { | ||
| return this.values.map((v) => v.toExponential(3)) | ||
| } | ||
|
|
||
| get title(): string { | ||
| return this.mapper.name ? this.mapper.name : "scalars" | ||
| } | ||
|
|
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| get font_height(): number { | ||
| let font_height = 0 | ||
| this.values.forEach((val) => { | ||
| const { | ||
| actualBoundingBoxAscent, | ||
| actualBoundingBoxDescent, | ||
| } = this.ctx.measureText(`${val}`) | ||
| const height = actualBoundingBoxAscent + actualBoundingBoxDescent | ||
| if (font_height < height) | ||
| font_height = height | ||
| }) | ||
| return font_height | ||
| } | ||
|
|
||
| draw_colorbar() { | ||
| this.canvas.width = this.canvas.clientWidth | ||
| this.canvas.height = this.canvas.clientHeight | ||
| const {palette} = this.mapper | ||
| this.ctx.font = `${this.options.fontSize} ${this.options.fontFamily}` | ||
| const font_height = this.font_height | ||
|
|
||
| this.ctx.save() | ||
| //colorbar | ||
| const image = document.createElement("canvas") | ||
| const h = 1 | ||
| const w = palette.length | ||
| image.width = w | ||
| image.height = h | ||
| const image_ctx = image.getContext("2d")! | ||
| const image_data = image_ctx.getImageData(0, 0, w, h) | ||
| const cmap = new LinearColorMapper({palette}).rgba_mapper | ||
| const buf8 = cmap.v_compute(range(0, palette.length)) | ||
| image_data.data.set(buf8) | ||
| image_ctx.putImageData(image_data, 0, 0) | ||
| this.ctx.drawImage( | ||
| image, | ||
| 0, | ||
| 2 * (this.font_height + 1) + 1, | ||
| this.canvas.width, | ||
| this.canvas.height | ||
| ) | ||
| this.ctx.restore() | ||
| this.ctx.save() | ||
| //title | ||
| this.ctx.textAlign = 'center' | ||
| this.ctx.fillText(this.title, this.canvas.width/2, font_height+1) | ||
| this.ctx.restore() | ||
| this.ctx.save() | ||
| //ticks | ||
| const tick_x_positions = linspace(0, this.canvas.width, 5) | ||
| tick_x_positions.forEach((xpos, idx) => { | ||
| let xpos_tick = xpos | ||
| if (idx == 0) { | ||
| xpos_tick = xpos + Math.ceil(this.ctx.lineWidth / 2) | ||
| this.ctx.textAlign = "left" | ||
| } else if (idx == tick_x_positions.length - 1) { | ||
| xpos_tick = xpos - Math.ceil(this.ctx.lineWidth / 2) | ||
| this.ctx.textAlign = "right" | ||
| } else { | ||
| this.ctx.textAlign = "center" | ||
| } | ||
| this.ctx.moveTo(xpos_tick, 2*(font_height+1)) | ||
| this.ctx.lineTo(xpos_tick, 2*(font_height+1)+5) | ||
| this.ctx.stroke() | ||
| this.ctx.fillText(`${this.ticks[idx]}`, xpos, 2*(font_height+1)) | ||
| }) | ||
| this.ctx.restore() | ||
| } | ||
| } |
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