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/**
* @internal
*/
interface WrapperDimensions {
height: number;
width: number;
}
/**
* @internal
*/
export function getPx(value: number): string {
return value + 'px';
}
/**
* @internal
*/
export function isASmallImage(widthPx: number, heightPx: number): boolean {
return widthPx && heightPx && (widthPx < MIN_HEIGHT_WIDTH || heightPx < MIN_HEIGHT_WIDTH)
? true
: false;
}
/**
* @internal Calculate the rotated x and y distance for mouse moving
* @param x Original x distance
* @param y Original y distance
* @param angle Rotated angle, in radian
* @returns rotated x and y distances
*/
export function rotateCoordinate(x: number, y: number, angle: number): [number, number] {
Iif (x == 0 && y == 0) {
return [0, 0];
}
const hypotenuse = Math.sqrt(x * x + y * y);
angle = Math.atan2(y, x) - angle;
return [hypotenuse * Math.cos(angle), hypotenuse * Math.sin(angle)];
}
/**
* @internal
*/
export function setFlipped(
element: HTMLElement | null,
flippedHorizontally?: boolean,
flippedVertically?: boolean
) {
Eif (element) {
element.style.transform = `scale(${flippedHorizontally ? -1 : 1}, ${
flippedVertically ? -1 : 1
})`;
}
}
/**
* @internal
*/
export function setWrapperSizeDimensions(
wrapper: HTMLElement,
image: HTMLImageElement,
width: number,
height: number,
isRotating: boolean
) {
const hasBorder = image.style.borderStyle;
if (hasBorder) {
const borderWidth = image.style.borderWidth ? 2 * parseInt(image.style.borderWidth) : 2;
if (isRotating) {
wrapper.style.width = getPx(parseInt(image.style.width) + borderWidth);
wrapper.style.height = getPx(parseInt(image.style.height) + borderWidth);
return;
}
wrapper.style.width = getPx(width + borderWidth);
wrapper.style.height = getPx(height + borderWidth);
return;
}
wrapper.style.width = getPx(width);
wrapper.style.height = getPx(height);
}
/**
* @internal
*/
export function setSize(
element: HTMLElement,
left: number | undefined,
top: number | undefined,
right: number | undefined,
bottom: number | undefined,
width: number | undefined,
height: number | undefined
) {
element.style.left = left !== undefined ? getPx(left) : element.style.left;
element.style.top = top !== undefined ? getPx(top) : element.style.top;
element.style.right = right !== undefined ? getPx(right) : element.style.right;
element.style.bottom = bottom !== undefined ? getPx(bottom) : element.style.bottom;
element.style.width = width !== undefined ? getPx(width) : element.style.width;
element.style.height = height !== undefined ? getPx(height) : element.style.height;
}
/**
* @internal
* Check if the current image was resized by the user
* @param image the current image
* @returns if the user resized the image, returns true, otherwise, returns false
*/
export function checkIfImageWasResized(image: HTMLImageElement): boolean {
const { style } = image;
const isMaxWidthInitial =
style.maxWidth === '' || style.maxWidth === 'initial' || style.maxWidth === 'auto';
if (
isMaxWidthInitial &&
(isFixedNumberValue(style.height) || isFixedNumberValue(style.width))
) {
return true;
} else {
return false;
}
}
function isFixedNumberValue(value: string | number) {
const numberValue = typeof value === 'string' ? parseInt(value) : value;
return !isNaN(numberValue);
}
/**
* @internal
*/
export function getActualWrapperDimensions(
image: HTMLImageElement,
wrapperWidth: number,
wrapperHeight: number
): WrapperDimensions {
const hasBorder = image.style.borderStyle;
const borderWidth =
hasBorder && image.style.borderWidth
? 2 * parseInt(image.style.borderWidth)
: hasBorder
? 2
: 0;
return {
width: wrapperWidth - borderWidth,
height: wrapperHeight - borderWidth,
};
}
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