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import * as React from 'react';
import * as _ from 'lodash/collection';
import styled from 'styled-components';
interface Props {
name: string;
size?: 'small' | 'medium' | 'large' | number;
}
export class ImageLoop extends React.Component<Props> {
private _img: Image;
private _ctx: CanvasRenderingContext2D;
private _x = 0;
private _speed = -1;
private _canvas = React.createRef();
constructor(props: Props) {
super(props);
}
public componentDidMount(): void {
const domImage = React.Children.only(this.props.children);
this._img = new Image(1446, 407);
this._img.src = domImage.props.src;
this._ctx = this._canvas.current.getContext('2d');
this._img.onload = this.updateCanvas.bind(this);
}
public render(): React.ReactNode {
return (
<Wrapper {...this.props}>
<canvas id="canvas" style={{ width: '100vw', height: '407px' }} ref={this._canvas} />
</Wrapper>
);
}
public updateCanvas(): void {
this.move();
const { width, height } = this._canvas.current;
this._ctx.clearRect(0, 0, width, height);
this.draw();
requestAnimationFrame(this.updateCanvas.bind(this));
}
public move(): void {
this._x += this._speed;
this._x %= this._canvas.current.width;
}
public draw(): void {
const img = this._img;
const imgWidth = img.naturalWidth / 2;
const imgHeight = img.naturalHeight / 2;
const currentPosition = this._x;
const canvasWidth = this._canvas.current.width;
this._ctx.drawImage(img, currentPosition, 0, imgWidth, imgHeight);
if (this._speed < 0) {
this._ctx.drawImage(img, currentPosition + canvasWidth, 0, imgWidth, imgHeight);
} else {
this._ctx.drawImage(img, currentPosition - imgWidth, 0, imgWidth, imgHeight);
}
}
}
export const Wrapper = styled.div`
margin: 0 0;
display: flex;
align-items: center;
justify-content: center;
`;
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