78 lines
2.2 KiB
TypeScript
78 lines
2.2 KiB
TypeScript
import { IAnimationData } from './Interfaces/IAnimationData';
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export class FrameHandler {
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private start: number = 0;
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private frameNumberDiv: HTMLElement;
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private animationData: IAnimationData;
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private filenames: string[] = [];
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private currentFrame: number = 0;
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private currentImageDiv: HTMLElement;
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private playingAnimation: boolean;
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constructor(animationData: IAnimationData, currentImageDiv: HTMLElement, frameNumberDiv: HTMLElement) {
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this.animationData = animationData;
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this.currentImageDiv = currentImageDiv;
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this.frameNumberDiv = frameNumberDiv;
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window.requestAnimationFrame(this.windowAnimationUpdate);
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}
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public GetCurrentFrame(): number {
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return this.currentFrame;
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}
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public loadFrames(filenames: string[]) {
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this.filenames = filenames;
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this.currentFrame = 0;
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this.SetCurrentImageDiv();
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}
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public AdvanceFrames(amount: number) {
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this.currentFrame += amount;
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this.currentFrame %= this.filenames.length;
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if (this.currentFrame < 0) {
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this.currentFrame = this.filenames.length - 1;
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}
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this.GoToFrame(this.currentFrame);
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}
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public GoToFrame(frame: number) {
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this.currentFrame = frame;
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this.SetCurrentImageDiv();
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}
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public TogglePlayingAnimation() {
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this.playingAnimation = !this.playingAnimation;
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console.log('playingAnimation = ', this.playingAnimation);
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}
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public StopPlayingAnimation() {
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this.playingAnimation = false;
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}
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private SetCurrentImageDiv() {
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this.currentImageDiv.innerHTML = `<img src="${this.filenames[this.currentFrame]}"></img>`;
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if (this.filenames.length === 0) {
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this.frameNumberDiv.className = 'warning';
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this.frameNumberDiv.innerText = 'No images uploaded yet';
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} else {
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this.frameNumberDiv.className = 'instruction';
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this.frameNumberDiv.innerText =
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'Frame ' + (this.currentFrame + 1).toString() + ' / ' + this.filenames.length.toString();
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}
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}
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private windowAnimationUpdate = (timestamp: number) => {
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if (this.start === 0) {
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this.start = timestamp;
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}
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const progress = timestamp - this.start;
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if (this.playingAnimation && progress > 1000 / this.animationData.frameRate) {
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this.AdvanceFrames(1);
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this.start = 0;
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}
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window.requestAnimationFrame(this.windowAnimationUpdate);
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// console.log('timestamp = ' + timestamp);
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};
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}
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