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export interface Point {
left: number
top: number
}
export interface Rect {
left: number
right: number
top: number
bottom: number
}
export function pointInsideRect(point: Point, rect: Rect): boolean {
return point.left >= rect.left &&
point.left < rect.right &&
point.top >= rect.top &&
point.top < rect.bottom
}
// Returns a new rectangle that is the intersection of the two rectangles. If they don't intersect, returns false
export function intersectRects(rect1: Rect, rect2: Rect): Rect | false {
let res = {
left: Math.max(rect1.left, rect2.left),
right: Math.min(rect1.right, rect2.right),
top: Math.max(rect1.top, rect2.top),
bottom: Math.min(rect1.bottom, rect2.bottom)
}
if (res.left < res.right && res.top < res.bottom) {
return res
}
return false
}
export function translateRect(rect: Rect, deltaX: number, deltaY: number): Rect {
return {
left: rect.left + deltaX,
right: rect.right + deltaX,
top: rect.top + deltaY,
bottom: rect.bottom + deltaY
}
}
// Returns a new point that will have been moved to reside within the given rectangle
export function constrainPoint(point: Point, rect: Rect): Point {
return {
left: Math.min(Math.max(point.left, rect.left), rect.right),
top: Math.min(Math.max(point.top, rect.top), rect.bottom)
}
}
// Returns a point that is the center of the given rectangle
export function getRectCenter(rect: Rect): Point {
return {
left: (rect.left + rect.right) / 2,
top: (rect.top + rect.bottom) / 2
}
}
// Subtracts point2's coordinates from point1's coordinates, returning a delta
export function diffPoints(point1: Point, point2: Point): Point {
return {
left: point1.left - point2.left,
top: point1.top - point2.top
}
}