Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { Node } from "../../../../codeCharta.model"
import { CanvasTexture, BackSide, Mesh, MeshBasicMaterial, PlaneGeometry, RepeatWrapping, Vector3 } from "three"
import { FloorLabelHelper } from "./floorLabelHelper"
export class FloorLabelDrawer {
private floorLabelPlanes: Mesh[] = []
private readonly rootNode: Node
private readonly mapSize: number
private readonly scaling: Vector3
readonly folderGeometryHeight: number = 2.01
private lastScaling: Vector3 = new Vector3(1, 1, 1)
private floorLabelPlaneLevel: Map<Mesh, number> = new Map<Mesh, number>()
private floorLabelsPerLevel = new Map()
constructor(nodes: Node[], rootNode: Node, mapSize: number, scaling: Vector3, experimentalFeaturesEnabled: boolean) {
this.collectLabelsPerLevel(nodes)
this.rootNode = rootNode
this.mapSize = mapSize
this.scaling = scaling
this.folderGeometryHeight = experimentalFeaturesEnabled
? Math.ceil(2 / FloorLabelHelper.getMapResolutionScaling(rootNode.width)) * 2
: 2.01
}
private collectLabelsPerLevel(nodes: Node[]) {
for (const node of nodes) {
if (FloorLabelHelper.isLabelNode(node)) {
if (!this.floorLabelsPerLevel.has(node.mapNodeDepth)) {
this.floorLabelsPerLevel.set(node.mapNodeDepth, [])
}
this.floorLabelsPerLevel.get(node.mapNodeDepth).push(node)
}
}
}
draw() {
const { width: rootNodeWidth, length: rootNodeHeight } = this.rootNode
const mapResolutionScaling = FloorLabelHelper.getMapResolutionScaling(rootNodeWidth)
const scaledMapWidth = rootNodeWidth * mapResolutionScaling
const scaledMapHeight = rootNodeHeight * mapResolutionScaling
for (const [floorLevel, floorNodesPerLevel] of this.floorLabelsPerLevel) {
const { textCanvas, context } = FloorLabelDrawer.createLabelPlaneCanvas(scaledMapWidth, scaledMapHeight)
this.writeLabelsOnCanvas(context, floorNodesPerLevel, mapResolutionScaling)
this.drawLevelPlaneGeometry(textCanvas, scaledMapWidth, scaledMapHeight, floorLevel, mapResolutionScaling)
}
return this.floorLabelPlanes
}
translatePlaneCanvases(scale: Vector3) {
const defaultFolderHeight = 2
for (const plane of this.floorLabelPlanes) {
const level = this.floorLabelPlaneLevel.get(plane) + 1
const difference = level * this.lastScaling.y - level * scale.y
plane.geometry.translate(0, 0, defaultFolderHeight * difference)
}
this.lastScaling = scale
}
private static createLabelPlaneCanvas(scaledMapWidth: number, scaledMapHeight: number) {
const textCanvas = document.createElement("canvas")
// Flip map width and height to support non squarified maps (e.g. if a rectangular subfolder is focused)
let textCanvasWidth = scaledMapWidth
let textCanvasHeight = scaledMapHeight
Iif (scaledMapWidth > scaledMapHeight) {
textCanvasWidth = scaledMapHeight
textCanvasHeight = scaledMapWidth
}
textCanvas.width = textCanvasWidth
textCanvas.height = textCanvasHeight
const context = textCanvas.getContext("2d")
context.fillStyle = "white"
context.textAlign = "center"
context.textBaseline = "middle"
return { textCanvas, context }
}
private writeLabelsOnCanvas(context: CanvasRenderingContext2D, floorNodesOfCurrentLevel: Node[], mapResolutionScaling: number) {
const { width: rootNodeWidth, length: rootNodeHeight } = this.rootNode
for (const floorNode of floorNodesOfCurrentLevel) {
let fontSize =
floorNode.depth === 0 ? Math.max(Math.floor(rootNodeWidth * 0.03), 120) : Math.max(Math.floor(rootNodeWidth * 0.023), 95)
fontSize = fontSize * mapResolutionScaling
context.font = `${fontSize}px Arial`
const textToFill = FloorLabelDrawer.getLabelAndSetContextFont(floorNode, context, mapResolutionScaling, fontSize)
context.fillText(
textToFill.labelText,
(rootNodeHeight - floorNode.y0 - floorNode.length / 2) * mapResolutionScaling,
(floorNode.x0 + floorNode.width) * mapResolutionScaling - textToFill.fontSize / 2
)
}
}
private drawLevelPlaneGeometry(textCanvas, scaledMapWidth, scaledMapHeight, floorLevel, mapResolutionScaling) {
const labelTexture = new CanvasTexture(textCanvas)
labelTexture.wrapS = RepeatWrapping
labelTexture.wrapT = RepeatWrapping
labelTexture.repeat.x = -1
labelTexture.needsUpdate = true
labelTexture.rotation = (90 * Math.PI) / 180
const plane = new PlaneGeometry(scaledMapWidth, scaledMapHeight)
const material = new MeshBasicMaterial({
side: BackSide,
map: labelTexture,
transparent: true
})
const planeMesh = new Mesh(plane, material)
// Rotate plane to be horizontally
planeMesh.rotateX((90 * Math.PI) / 180)
// Position plane over the map
const liftToPreventZFighting = 2
plane.translate(
scaledMapWidth / 2,
scaledMapHeight / 2,
-this.folderGeometryHeight * this.scaling.y * (floorLevel + 1) - liftToPreventZFighting
)
// Move and scale plane mesh exactly like the squarified map
planeMesh.scale.set(this.scaling.x / mapResolutionScaling, this.scaling.z / mapResolutionScaling, 1)
planeMesh.position.set(-this.mapSize * this.scaling.x, 0, -this.mapSize * this.scaling.z)
this.floorLabelPlanes.push(planeMesh)
this.floorLabelPlaneLevel.set(planeMesh, floorLevel)
}
private static getLabelAndSetContextFont(
labelNode: Node,
context: CanvasRenderingContext2D,
mapResolutionScaling: number,
fontSize: number
) {
const labelText = labelNode.name
const floorWidth = labelNode.length * mapResolutionScaling
context.font = `${fontSize}px Arial`
const textMetrics = context.measureText(labelText)
const fontScaleFactor = FloorLabelDrawer.getFontScaleFactor(floorWidth, textMetrics.width)
if (fontScaleFactor <= 0.5) {
// Font will be to small.
// So scale text not smaller than 0.5 and shorten it as well
fontSize = fontSize * 0.5
fontSize = Math.floor(Math.min(fontSize, labelNode.width * mapResolutionScaling))
context.font = `${fontSize}px Arial`
return {
labelText: FloorLabelDrawer.getFittingLabelText(context, floorWidth, labelText),
fontSize
}
}
fontSize = Math.floor(Math.min(fontSize * fontScaleFactor, labelNode.width * mapResolutionScaling))
context.font = `${fontSize}px Arial`
return { labelText, fontSize }
}
private static getFontScaleFactor(canvasWidth: number, widthOfText: number) {
return widthOfText < canvasWidth ? 1 : canvasWidth / widthOfText
}
private static getFittingLabelText(context: CanvasRenderingContext2D, canvasWidth: number, labelText: string) {
const { width } = context.measureText(labelText)
let textSplitIndex = Math.floor((labelText.length * canvasWidth) / width)
let abbreviatedText = `${labelText.slice(0, textSplitIndex)}…`
// TODO: Check if this is expensive. If it is, let's use a logarithmic algorithm instead.
// This is needed for non monospaced fonts, imagine the following example in a non monospaced font: "WWWIII"
while (context.measureText(abbreviatedText).width >= canvasWidth && textSplitIndex > 1) {
// textSplitIndex > 1 to ensure it contains at least one char
textSplitIndex -= 1
abbreviatedText = `${labelText.slice(0, textSplitIndex)}…`
}
return abbreviatedText
}
}
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