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import { constrainToRange } from '@/utils/helperFns';
import type { ElementSizePosition, ClientPosition } from '@/utils/types';
import type { GlareProps } from './types.public';
// All props are initialized by default with non-null values
/* eslint-disable @typescript-eslint/no-non-null-assertion */
type GlareSize = {
width: number;
height: number;
};
export class Glare {
public glareWrapperEl: HTMLDivElement;
public glareEl: HTMLDivElement;
public glareAngle = 0;
public glareOpacity = 0;
constructor(wrapperElSize: ElementSizePosition, glareBorderRadius: string) {
this.glareWrapperEl = document.createElement('div');
this.glareEl = document.createElement('div');
this.glareWrapperEl.appendChild(this.glareEl);
this.glareWrapperEl.className = 'glare-wrapper';
this.glareEl.className = 'glare';
const styleGlareWrapper: CSSProperties = {
position: 'absolute',
top: '0',
left: '0',
width: '100%',
height: '100%',
overflow: 'hidden',
borderRadius: glareBorderRadius,
// Safari border-radius https://github.com/mkosir/react-parallax-tilt/issues/27#issuecomment-809884059
WebkitMaskImage: '-webkit-radial-gradient(white, black)',
pointerEvents: 'none',
};
const glareSize = this.calculateGlareSize(wrapperElSize);
const styleGlare: CSSProperties = {
position: 'absolute',
top: '50%',
left: '50%',
transformOrigin: '0% 0%',
pointerEvents: 'none',
width: `${glareSize.width}px`,
height: `${glareSize.height}px`,
};
Object.assign(this.glareWrapperEl.style, styleGlareWrapper);
Object.assign(this.glareEl.style, styleGlare);
}
private calculateGlareSize = (wrapperElSize: ElementSizePosition): GlareSize => {
const { width, height } = wrapperElSize;
const wrapperElDiagonal = Math.sqrt(width! ** 2 + height! ** 2);
return {
width: wrapperElDiagonal,
height: wrapperElDiagonal,
};
};
public setSize = (wrapperElSize: ElementSizePosition): void => {
const glareSize = this.calculateGlareSize(wrapperElSize);
this.glareEl.style.width = `${glareSize.width}px`;
this.glareEl.style.height = `${glareSize.height}px`;
};
public update = (
wrapperElClientPosition: ClientPosition,
props: GlareProps,
flipVertically: boolean,
flipHorizontally: boolean,
): void => {
this.updateAngle(wrapperElClientPosition, props.glareReverse!);
this.updateOpacity(wrapperElClientPosition, props, flipVertically, flipHorizontally);
};
private updateAngle = (wrapperElClientPosition: ClientPosition, glareReverse: boolean): void => {
const { xPercentage, yPercentage } = wrapperElClientPosition;
const rad2Deg = 180 / Math.PI;
// top 0°, right +90°, bottom -+180°, left -90°
const glareAngle = xPercentage ? Math.atan2(yPercentage, -xPercentage) * rad2Deg : 0;
const addGlareAngle = glareReverse ? 180 : 0;
this.glareAngle = glareAngle - addGlareAngle;
};
private updateOpacity = (
wrapperElClientPosition: ClientPosition,
props: GlareProps,
flipVertically: boolean,
flipHorizontally: boolean,
): void => {
const { xPercentage, yPercentage } = wrapperElClientPosition;
const { glarePosition, glareReverse, glareMaxOpacity } = props;
const flipVerticallyFactor = flipVertically ? -1 : 1;
const flipHorizontallyFactor = flipHorizontally ? -1 : 1;
const glareReverseFactor = glareReverse ? -1 : 1;
let glareOpacityFactor = 0;
switch (glarePosition) {
case 'top':
glareOpacityFactor = -xPercentage * flipVerticallyFactor * glareReverseFactor;
break;
case 'right':
glareOpacityFactor = yPercentage * flipHorizontallyFactor * glareReverseFactor;
break;
case 'bottom':
case undefined:
glareOpacityFactor = xPercentage * flipVerticallyFactor * glareReverseFactor;
break;
case 'left':
glareOpacityFactor = -yPercentage * flipHorizontallyFactor * glareReverseFactor;
break;
case 'all':
glareOpacityFactor = Math.hypot(xPercentage, yPercentage);
break;
}
const glareOpacityFactorRemoveNegative = constrainToRange(glareOpacityFactor, 0, 100);
this.glareOpacity = (glareOpacityFactorRemoveNegative * glareMaxOpacity!) / 100;
};
public render = (props: GlareProps): void => {
const { glareColor } = props;
this.glareEl.style.transform = `rotate(${this.glareAngle}deg) translate(-50%, -50%)`;
this.glareEl.style.opacity = this.glareOpacity.toString();
this.glareEl.style.background = `linear-gradient(0deg, rgba(255,255,255,0) 0%, ${glareColor!} 100%)`;
};
}
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