Webleb - Code-Snippets - SVG-Spieloberfläche: Punktestand, Leben, Game-Over-Bildschirm

HTML

<g font-size="36" id="game-over-screen" pointer-events="none" visibility="hidden" >
			<text x="225" y="220" text-anchor="middle" stroke="#603719" stroke-width="10">GAME OVER</text>
			<text x="225" y="220" text-anchor="middle" fill="#f16f33">GAME OVER</text>
			<text id="final-score-info" x="225" y="260" text-anchor="middle" font-size="24" fill="white">Final Score: 0</text>
		</g>

<symbol id="toast" xmlns="http://www.w3.org/2000/svg" width="95" height="57" viewBox="0 0 95 57">
			<path class="toast__wings" fill="#FDE2A9" stroke="#7F3412" stroke-linejoin="round" stroke-width="3" d="M3.793 18.165c.905-.484 1.938-.526 2.887-.399 1.88.252 4.141 1.27 6.375 2.527 3.967 2.234 8.385 5.539 11.558 8.103l1.279 1.048.105.096a1.5 1.5 0 0 1 .424.87l1.47 11.701a1.5 1.5 0 0 1-.432 1.254c-3.981 3.94-8.147 4.232-10.628 2.541-1.168-.796-2.067-2.187-1.735-3.753.053-.25.135-.483.24-.702-1.743-.454-3.15-1.018-4.257-1.658-1.747-1.01-2.903-2.31-3.22-3.799-.292-1.363.181-2.602 1.058-3.47-1.424-.708-2.823-1.57-4-2.646-2.349-2.147-3.818-5.157-2.921-9.21l.05-.2c.265-.997.838-1.817 1.747-2.303Zm85.793-2.258c-1.486-.17-3.23.45-4.847 1.238-2.93 1.426-6.42 3.904-9.438 6.2l-1.26.971-.133.116a1.5 1.5 0 0 0-.448 1.1l.251 12.107a1.5 1.5 0 0 0 1.44 1.468c3.919.158 6.967-.368 9.192-1.296 2.19-.913 3.742-2.294 4.306-3.937.288-.837.307-1.725.002-2.556-.304-.828-.892-1.499-1.647-1.973a5.05 5.05 0 0 0-.67-.351 23.515 23.515 0 0 0 2.936-2.553c1.003-1.038 1.868-2.154 2.475-3.29.6-1.126.998-2.366.924-3.61-.055-.913-.297-1.79-.868-2.481-.595-.72-1.4-1.06-2.215-1.153Z"/>
			<mask id="a" fill="#fff">
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			</mask>
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			<mask id="b" fill="#fff">
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			</mask>
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			<g class="toast__eyes">
				<ellipse cx="61.42" cy="25.123" fill="#7F3412" rx="2.5" ry="3.5" transform="rotate(-3.404 61.42 25.123)"/>
				<ellipse cx="42.994" cy="26.502" fill="#7F3412" rx="2.5" ry="3.5" transform="rotate(-3.404 42.994 26.502)"/>
			</g>
		</symbol>
	</svg>
</div>

CSS

JS

class Game {
	constructor() {
		this.svg = document.getElementById('game')
		this.toastSymbolId = '#toast'
		this.scoreEl = document.getElementById('score')
		this.livesEl = document.getElementById('lives')
		this.finalScoreInfoEl = document.getElementById('final-score-info')
		this.gameOverScreenEl = document.getElementById('game-over-screen')
		this.toasts = []
		this.score = 0
		this.spawnInterval = 2000
		this.remainingLives = 5
		this.gameOver = false
		this.gameStartTime = performance.now()

this.loop = this.loop.bind(this)
		this.spawnToast()
		this.startSpawnTimer()
		this.updateLives()
		requestAnimationFrame(this.loop)
	}

startSpawnTimer() {
		if (this.spawnTimer) {
			clearInterval(this.spawnTimer)
		}
		
		const gameTimeSeconds = (performance.now() - this.gameStartTime) / 1000
		this.spawnInterval = Math.max(500, 2000 - Math.floor(gameTimeSeconds / 10) * 100)
		
		this.spawnTimer = setInterval(() => {
			if (!this.gameOver) {
				this.spawnToast()
				
				this.startSpawnTimer()
			}
		}, this.spawnInterval)
	}

spawnToast() {
		if (this.gameOver) return

const startX = Math.random() * 350 + 25
		const endX = Math.random() * 350 + 25
		const peakY = 200 + Math.random() * 50

const toast = document.createElementNS('http://www.w3.org/2000/svg', 'use')
		toast.setAttribute('href', this.toastSymbolId)
		toast.setAttribute('class', 'toast')
		toast.setAttribute('x', startX)
		toast.setAttribute('y', 680)
		this.svg.appendChild(toast)

const toastObj = {
			el: toast,
			startX,
			endX,
			startY: 680,
			peakY,
			startTime: performance.now(),
			duration: 3000,
			clicked: false,
			upwardSpeed: -8,
			reachedBottom: false
		}

toast.addEventListener('pointerdown', () => {
			if (!this.gameOver && !toastObj.clicked) {
				this.score += 1
				this.scoreEl.textContent = this.score.toString().padStart(8, '0')
				toastObj.clicked = true
			}
		})

this.toasts.push(toastObj)
	}

checkGameOver() {
		if (this.remainingLives <= 0) {
			this.gameOver = true
			clearInterval(this.spawnTimer)

this.gameOverScreenEl.setAttribute('visibility','visible')
			this.finalScoreInfoEl.textContent = `Final Score: ${this.score}`
		}
	}

loop(timestamp) {
		if (this.gameOver) {
			requestAnimationFrame(this.loop)
			return
		}

this.toasts = this.toasts.filter(toast => {
			const t = (timestamp - toast.startTime) / toast.duration

if (toast.clicked) {
				const currentY = parseFloat(toast.el.getAttribute('y'))
				const newY = currentY + toast.upwardSpeed
				toast.el.setAttribute('y', newY)
				toast.el.setAttribute('pointer-events', 'none')
				if (newY < -50) {
					toast.el.remove()
					return false
				}
			} else {

if (t > 1) {

if (!toast.reachedBottom) {
						this.remainingLives--
						this.updateLives()
						this.checkGameOver()
						toast.reachedBottom = true
					}
					toast.el.remove()
					return false
				}

const x = toast.startX + (toast.endX - toast.startX) * t
				const y = toast.startY - (4 * t * (1 - t)) * (toast.startY - toast.peakY)

toast.el.setAttribute('x', x)
				toast.el.setAttribute('y', y)
			}

return true
		})

requestAnimationFrame(this.loop)
	}
	
	updateLives(){
			this.livesEl.textContent = `${this.remainingLives}X`
	}
	
}

const game = new Game()

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