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import { PointVector } from "./PointVector"
import pixelWidth from "string-pixel-width"
import { Box, GridParameters, Position, PositionMap } from "./owidTypes"
// Important utility class for all visualizations
// Since we want to be able to render charts headlessly and functionally, we
// can't rely on the DOM to do these calculations for us, and instead must
// calculate using geometry and first principles
type PadObject = PositionMap<number>
export interface GridBounds {
col: number
row: number
edges: Set<Position>
bounds: Bounds
}
export class Bounds {
static ctx: CanvasRenderingContext2D
static fromProps(props: Box): Bounds {
const { x, y, width, height } = props
return new Bounds(x, y, width, height)
}
static fromBBox(bbox: Box): Bounds {
return this.fromProps(bbox)
}
static fromRect(rect: ClientRect): Bounds {
return new Bounds(rect.left, rect.top, rect.width, rect.height)
}
static fromElement(el: HTMLElement): Bounds {
return Bounds.fromRect(el.getBoundingClientRect())
}
static fromCorners(p1: PointVector, p2: PointVector): Bounds {
const x1 = Math.min(p1.x, p2.x)
const x2 = Math.max(p1.x, p2.x)
const y1 = Math.min(p1.y, p2.y)
const y2 = Math.max(p1.y, p2.y)
return new Bounds(x1, y1, x2 - x1, y2 - y1)
}
// Merge a collection of bounding boxes into a single encompassing Bounds
static merge(boundsList: Bounds[]): Bounds {
let x1 = Infinity,
y1 = Infinity,
x2 = -Infinity,
y2 = -Infinity
for (const b of boundsList) {
x1 = Math.min(x1, b.x)
y1 = Math.min(y1, b.y)
x2 = Math.max(x2, b.x + b.width)
y2 = Math.max(y2, b.y + b.height)
}
return Bounds.fromCorners(
new PointVector(x1, y1),
new PointVector(x2, y2)
)
}
static empty(): Bounds {
return new Bounds(0, 0, 0, 0)
}
static forText(
str: string = "",
{
x = 0,
y = 0,
fontSize = 16,
fontWeight = 400,
}: {
x?: number
y?: number
fontSize?: number
fontWeight?: number
fontFamily?: string
} = {}
): Bounds {
// Collapse contiguous spaces into one
str = str.replace(/ +/g, " ")
const isBold = fontWeight >= 600
let bounds = Bounds.empty()
if (str) {
// pixelWidth uses a precomputed character width table to quickly give a
// rough estimate of string width based on characters in a string - it is probably not
// worth caching further
const width = pixelWidth(str, {
font: "arial",
size: fontSize,
bold: isBold,
})
const height = fontSize
bounds = new Bounds(x, y - height, width, height)
}
return bounds
}
readonly x: number
readonly y: number
readonly width: number
readonly height: number
constructor(x: number, y: number, width: number, height: number) {
this.x = x
this.y = y
this.width = Math.max(width, 0)
this.height = Math.max(height, 0)
}
get left(): number {
return this.x
}
get top(): number {
return this.y
}
get right(): number {
return this.x + this.width
}
get bottom(): number {
return this.y + this.height
}
get centerX(): number {
return this.x + this.width / 2
}
get centerY(): number {
return this.y + this.height / 2
}
get centerPos(): PointVector {
return new PointVector(this.centerX, this.centerY)
}
get area(): number {
return this.width * this.height
}
get topLeft(): PointVector {
return new PointVector(this.left, this.top)
}
get topRight(): PointVector {
return new PointVector(this.right, this.top)
}
get bottomLeft(): PointVector {
return new PointVector(this.left, this.bottom)
}
get bottomRight(): PointVector {
return new PointVector(this.right, this.bottom)
}
padLeft(amount: number): Bounds {
return new Bounds(
this.x + amount,
this.y,
this.width - amount,
this.height
)
}
padRight(amount: number): Bounds {
return new Bounds(this.x, this.y, this.width - amount, this.height)
}
padBottom(amount: number): Bounds {
return new Bounds(this.x, this.y, this.width, this.height - amount)
}
padTop(amount: number): Bounds {
return new Bounds(
this.x,
this.y + amount,
this.width,
this.height - amount
)
}
padWidth(amount: number): Bounds {
return new Bounds(
this.x + amount,
this.y,
this.width - amount * 2,
this.height
)
}
padHeight(amount: number): Bounds {
return new Bounds(
this.x,
this.y + amount,
this.width,
this.height - amount * 2
)
}
fromLeft(amount: number): Bounds {
return this.padRight(this.width - amount)
}
fromBottom(amount: number): Bounds {
return this.padTop(this.height - amount)
}
pad(amount: number | PadObject): Bounds {
if (isNumber(amount)) {
return new Bounds(
this.x + amount,
this.y + amount,
this.width - amount * 2,
this.height - amount * 2
)
}
return this.padTop(amount.top ?? 0)
.padRight(amount.right ?? 0)
.padBottom(amount.bottom ?? 0)
.padLeft(amount.left ?? 0)
}
expand(amount: number | PadObject): Bounds {
if (isNumber(amount)) return this.pad(-amount)
return this.pad(
mapValues(amount, (v) => (v !== undefined ? -v : undefined))
)
}
set(props: {
x?: number
y?: number
width?: number
height?: number
}): Bounds {
return Bounds.fromProps({ ...this, ...props })
}
scale(scale: number): Bounds {
return new Bounds(
this.x * scale,
this.y * scale,
this.width * scale,
this.height * scale
)
}
intersects(otherBounds: Bounds): boolean {
const r1 = this
const r2 = otherBounds
return !(
r2.left > r1.right ||
r2.right < r1.left ||
r2.top > r1.bottom ||
r2.bottom < r1.top
)
}
lines(): PointVector[][] {
return [
[this.topLeft, this.topRight],
[this.topRight, this.bottomRight],
[this.bottomRight, this.bottomLeft],
[this.bottomLeft, this.topLeft],
]
}
boundedPoint(p: PointVector): PointVector {
return new PointVector(
Math.max(Math.min(p.x, this.right), this.left),
Math.max(Math.min(p.y, this.bottom), this.top)
)
}
containsPoint(x: number, y: number): boolean {
return (
x >= this.left &&
x <= this.right &&
y >= this.top &&
y <= this.bottom
)
}
contains(p: PointVector): boolean {
return this.containsPoint(p.x, p.y)
}
encloses(bounds: Bounds): boolean {
return (
this.containsPoint(bounds.left, bounds.top) &&
this.containsPoint(bounds.left, bounds.bottom) &&
this.containsPoint(bounds.right, bounds.top) &&
this.containsPoint(bounds.right, bounds.bottom)
)
}
toCSS(): { left: string; top: string; width: string; height: string } {
return {
left: `${this.left}px`,
top: `${this.top}px`,
width: `${this.width}px`,
height: `${this.height}px`,
}
}
toProps(): { x: number; y: number; width: number; height: number } {
return { x: this.x, y: this.y, width: this.width, height: this.height }
}
toArray(): [[number, number], [number, number]] {
return [
[this.left, this.top],
[this.right, this.bottom],
]
}
xRange(): [number, number] {
return [this.left, this.right]
}
grid(
gridParams: GridParameters,
padding: SplitBoundsPadding = {}
): GridBounds[] {
const { columns, rows } = gridParams
const { columnPadding = 0, rowPadding = 0, outerPadding = 0 } = padding
const contentWidth =
this.width - columnPadding * (columns - 1) - outerPadding * 2
const contentHeight =
this.height - rowPadding * (rows - 1) - outerPadding * 2
const boxWidth = Math.floor(contentWidth / columns)
const boxHeight = Math.floor(contentHeight / rows)
return range(0, rows * columns).map((index: number) => {
const col = index % columns
const row = Math.floor(index / columns)
const edges = new Set<Position>()
if (col === 0) edges.add(Position.left)
if (col === columns - 1) edges.add(Position.right)
if (row === 0) edges.add(Position.top)
if (row === rows - 1) edges.add(Position.bottom)
return {
row,
col,
edges,
bounds: new Bounds(
this.x + outerPadding + col * (boxWidth + columnPadding),
this.y + outerPadding + row * (boxHeight + rowPadding),
boxWidth,
boxHeight
),
}
})
}
yRange(): [number, number] {
return [this.bottom, this.top]
}
equals(bounds: Bounds): boolean {
return (
this.x === bounds.x &&
this.y === bounds.y &&
this.width === bounds.width &&
this.height === bounds.height
)
}
// Calculate squared distance between a given point and the closest border of the bounds
// If the point is within the bounds, returns 0
private distanceToPointSq(p: PointVector): number {
if (this.contains(p)) return 0
const cx = Math.max(Math.min(p.x, this.x + this.width), this.x)
const cy = Math.max(Math.min(p.y, this.y + this.height), this.y)
return (p.x - cx) * (p.x - cx) + (p.y - cy) * (p.y - cy)
}
distanceToPoint(p: PointVector): number {
return Math.sqrt(this.distanceToPointSq(p))
}
}
interface SplitBoundsPadding {
columnPadding?: number
rowPadding?: number
outerPadding?: number
}
// Since nearly all our components need a bounds, but most tests don't care about bounds, have a default bounds
// to use so we don't have to create a bounds for every test.
export const DEFAULT_BOUNDS = new Bounds(0, 0, 640, 480)
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