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import { clamp, sign } from './utils';
/**
* Represents the zoom state of the image.
* x & y coordinates are in pixels of the resized, post-object-fit but pre-zoom image
* @typedef {object} ZoomState
* @property {object} origin
* @property {number} origin.x
* @property {number} origin.y
* @property {number} scale
* @property {boolean} panning
* @property {object} panStart
* @property {number} panStart.x
* @property {number} panStart.y
* @property {object} panStart.zoomOrigin
* @property {number} panStart.zoomOrigin.x
* @property {number} panStart.zoomOrigin.y
*/
/**
* @type {ZoomState}
*/
export const INITIAL_ZOOM_STATE = {
origin: { x: 0, y: 0 },
scale: 1,
panning: false,
panStart: { x: 0, y: 0, zoomOrigin: { x: 0, y: 0 } }
};
/**
* Calculate bounding rect for an image element that has object-fit: contain. The boundingClientRect is not the same as the actual, displayed image. We use both natural{Width,Height} and client{Width,Height} to calculate the displayed image size.
* You can also provide the zoom state to take it into account.
* @param {Pick<HTMLImageElement, `${'natural'|'client'}${'Width'|'Height'}` | `client${'Top'|'Left'}`>} imageElement
* @param {ZoomState} [zoomState] take into account the zoom state of the image
*/
export function fittedImageRect(
{ naturalWidth, naturalHeight, clientWidth, clientHeight, clientTop, clientLeft },
zoomState
) {
const naturalRatio = naturalWidth / naturalHeight;
const clientRatio = clientWidth / clientHeight;
let width = 0;
let height = 0;
if (naturalRatio < clientRatio) {
width = clientHeight * naturalRatio;
height = clientHeight;
} else {
height = clientWidth / naturalRatio;
width = clientWidth;
}
if (zoomState) {
width *= zoomState.scale;
height *= zoomState.scale;
}
return {
width,
height,
x: (zoomState?.origin.x ?? 0) + clientLeft + (clientWidth - width) / 2,
y: (zoomState?.origin.y ?? 0) + clientTop + (clientHeight - height) / 2
};
}
export class NewBoundingBox {
/**
* @type {import('./BoundingBoxes.svelte').Rect}
* Limits for the resulting bounding box. Coordinates will be clamped to these values.
*/
limits = {
x: 0,
y: 0,
width: 0,
height: 0
};
/** @type {'clickanddrag' | '2point' | '4point'|'off'} */
createMode = $state('clickanddrag');
/** @param {'clickanddrag' | '2point' | '4point'|'off'} mode */
setCreateMode(mode) {
this.createMode = mode;
}
/** @type {import('./BoundingBoxes.svelte').Rect & { dragDirection: {x:-1|0|1, y:-1|0|1} }} */
clickanddrag = $state({
x: 0,
y: 0,
width: 0,
height: 0,
// -1 or 1
dragDirection: {
x: 0,
y: 0
}
});
/** @type {Array<{x: number; y: number}>} */
points = $state([]);
/**
* The bounding box has enough data to be created
*/
ready = $derived.by(() => {
if (this.createMode === 'clickanddrag') {
return type({
x: 'number > 0',
y: 'number > 0',
width: 'number > 0',
height: 'number > 0'
}).allows(this.clickanddrag);
}
if (this.createMode == '2point') {
return this.points.length >= 2;
}
if (this.createMode === '4point') {
return this.points.length >= 4;
}
return false;
});
/**
*
* @param {import('./BoundingBoxes.svelte').Rect} rect
* @returns {import('./BoundingBoxes.svelte').Rect}
*/
clamp(rect) {
return {
x: clamp(rect.x, this.limits.x, this.limits.width),
y: clamp(rect.y, this.limits.y, this.limits.height),
width: clamp(rect.width, 0, this.limits.width - rect.x),
height: clamp(rect.height, 0, this.limits.height - rect.y)
};
}
x = $derived.by(() => {
if (this.createMode === 'clickanddrag') return this.clickanddrag.x;
if (this.createMode === 'off') return 0;
return Math.min(...this.points.map((point) => point.x));
});
y = $derived.by(() => {
if (this.createMode === 'clickanddrag') return this.clickanddrag.y;
if (this.createMode === 'off') return 0;
return Math.min(...this.points.map((point) => point.y));
});
width = $derived.by(() => {
if (this.createMode === 'clickanddrag') return this.clickanddrag.width;
if (this.createMode === 'off') return 0;
return Math.max(...this.points.map((point) => point.x)) - this.x;
});
height = $derived.by(() => {
if (this.createMode === 'clickanddrag') return this.clickanddrag.height;
if (this.createMode === 'off') return 0;
return Math.max(...this.points.map((point) => point.y)) - this.y;
});
/**
* A new point was just clicked: register it.
* clickanddrag: sets x, y
* 2point: sets x1, y1 then x2, y2
* 4point: sets topleft, topright, bottomright, bottomleft
* @param {number} x
* @param {number} y
*/
registerPoint(x, y) {
if (this.createMode === 'off') {
return;
}
if (this.createMode === 'clickanddrag') {
this.clickanddrag = { ...this.clickanddrag, x, y };
return;
}
this.points.push({ x, y });
}
/**
* @param {number} dx (MouseEvent).movementX
* @param {number} dy (MouseEvent).movementY
*/
registerMovement(dx, dy) {
if (this.createMode !== 'clickanddrag') return;
const { width, height } = this.clickanddrag;
if (width <= 0 || height <= 0) {
this.clickanddrag.dragDirection = {
x: sign(dx),
y: sign(dy)
};
}
const { x: xdir, y: ydir } = this.clickanddrag.dragDirection;
// Drag direction: topleft -> bottomright
if (xdir > 0 && ydir > 0) {
this.clickanddrag.width += dx;
this.clickanddrag.height += dy;
}
// Drag direction: bottomright -> topleft
if (xdir < 0 && ydir < 0) {
this.clickanddrag.x += dx;
this.clickanddrag.y += dy;
this.clickanddrag.width -= dx;
this.clickanddrag.height -= dy;
}
// Drag direction: topright -> bottomleft
if (xdir < 0 && ydir > 0) {
this.clickanddrag.x += dx;
this.clickanddrag.height += dy;
this.clickanddrag.width -= dx;
}
// Drag direction: bottomleft -> topright
if (xdir > 0 && ydir < 0) {
this.clickanddrag.y += dy;
this.clickanddrag.width += dx;
this.clickanddrag.height -= dy;
}
}
rect() {
return this.clamp({
x: this.x,
y: this.y,
width: this.width,
height: this.height
});
}
reset() {
this.clickanddrag = {
x: 0,
y: 0,
width: 0,
height: 0,
dragDirection: {
x: 0,
y: 0
}
};
this.points = [];
}
/**
*
* @param {object} options
* @param {typeof this.limits} options.limits
*/
constructor({ limits }) {
this.limits = limits;
this.clickanddrag = {
x: 0,
y: 0,
width: 0,
height: 0,
dragDirection: {
x: 0,
y: 0
}
};
this.points = [];
}
}
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