OnePager/test2.html at main · kaheller/OnePager · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Bouncing Circles with Black Dot</title>

    <!-- Google Fonts link -->
    <link rel="preconnect" href="https://fonts.googleapis.com">
    <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin>
    <link href="https://fonts.googleapis.com/css2?family=Bebas+Neue&family=Jersey+20&display=swap" rel="stylesheet">

    <style>
        body {
            margin: 0;
            overflow: hidden; /* Prevent scrollbars */
            background-color: white; /* Initial background color */
            font-family: 'Bebas Neue', sans-serif; /* Apply Bebas Neue font globally */
        }

        canvas {
            display: block;
            background-color: white; /* Initial canvas background */
        }

        /* Styling for the headline */
        h1 {
            position: absolute;
            top: 20px;
            left: 50%;
            transform: translateX(-50%);
            font-family: 'Jersey 20', sans-serif; /* Apply Jersey 20 font to the headline */
            font-size: 48px;
            color: black;
            margin: 0;
            z-index: 10;
        }

        #info-box {
            position: absolute;
            top: 20px;
            right: 20px;
            background-color: rgba(0, 0, 0, 0.7); /* Semi-transparent black background */
            color: white;
            padding: 10px 20px; /* Padding inside the box */
            font-size: 24px;
            border-radius: 10px; /* Rounded corners */
            z-index: 10;
        }


        /* Counter box for the colors eaten */
        #counter {
            position: absolute;
            top: 100px;
            left: 50%;
            transform: translateX(-50%);
            background-color: rgba(0, 0, 0, 0.7); /* Semi-transparent black background */
            color: white;
            padding: 15px 30px; /* Reduced padding for a smaller box */
            border-radius: 10px;
            display: flex;
            align-items: center;
            z-index: 10;
            flex-wrap: wrap;
            justify-content: center;
            width: auto;
            min-width: 350px; /* Ensures a minimum width */
        }


        .color-triangle {
            width: 0;
            height: 0;
            border-left: 12px solid transparent;
            border-right: 12px solid transparent;
            margin-right: 10px;
            display: inline-block;
        }

        /* Styling for the count number */
        .color-count {
            font-size: 20px;
            margin-right: 20px;
            color: white;
        }
    </style>
</head>
<body>

    <!-- Headline -->
    <h1>FEED THE CIRCLE</h1>

    <!-- Counter Box -->
    <div id="counter"></div>

    <div id="info-box">Collect them all and learn something fun about canvas!</div>


    <canvas></canvas>

    <script>
        const canvas = document.querySelector('canvas');
        const context = canvas.getContext('2d');
        const counterBox = document.getElementById('counter');

        // Set canvas size
        function setCanvasSize() {
            canvas.width = window.innerWidth;
            canvas.height = window.innerHeight;
        }
        setCanvasSize();
        window.addEventListener('resize', setCanvasSize);

        const circles = [];
        const colorCount = {};


        const circleColors = [
            "#6fffe9", "#5bc0be", "#3a506b", "#1c2541", "#533747" // New color palette
        ];

        // Initialize the color count for each color to 0
        circleColors.forEach(color => {
            colorCount[color] = 0;
        });

        // Initialize the counter box with triangles and count
        function initializeCounter() {
            counterBox.innerHTML = ''; // Clear counter box

            circleColors.forEach(color => {
                // Create the triangle
                const triangle = document.createElement('div');
                triangle.classList.add('color-triangle');
                triangle.style.borderBottom = `20px solid ${color}`;

                // Create the count
                const countText = document.createElement('span');
                countText.classList.add('color-count');
                countText.textContent = '0';  // Initial count starts at 0

                // Add to the counter box
                const colorEntry = document.createElement('div');
                colorEntry.style.display = 'flex';
                colorEntry.style.alignItems = 'center';
                colorEntry.appendChild(triangle);
                colorEntry.appendChild(countText);
                counterBox.appendChild(colorEntry);
            });
        }

        // Add a new colored circle on click
        canvas.addEventListener('click', (event) => {
            addCircle(event.clientX, event.clientY);
        });

        function addCircle(x, y) {
            const color = randomColor();
            circles.push({
                x: x,
                y: y,
                radius: 20 + Math.random() * 20,
                color: color,
                dx: (Math.random() - 0.5) * 3,
                dy: (Math.random() - 0.5) * 3
            });
        }

        function randomColor() {
            return circleColors[Math.floor(Math.random() * circleColors.length)];
        }

        function circlesCollide(c1, c2) {
            const distance = Math.hypot(c1.x - c2.x, c1.y - c2.y);
            return distance < c1.radius + c2.radius;
        }

        // Resolve collision with velocity adjustment
        function resolveCollision(c1, c2) {
            const dx = c1.x - c2.x;
            const dy = c1.y - c2.y;
            const distance = Math.hypot(dx, dy);

            if (distance === 0) return; // Avoid division by zero

            // Normalize the collision vector
            const nx = dx / distance;
            const ny = dy / distance;

            // Relative velocity
            const vx = c1.dx - c2.dx;
            const vy = c1.dy - c2.dy;

            // Velocity along the collision normal
            const dotProduct = vx * nx + vy * ny;

            if (dotProduct > 0) return; // Prevent double resolution

            // Apply velocity reflection
            const impulse = (2 * dotProduct) / (1 + 1); // Assuming equal mass

            c1.dx -= impulse * nx;
            c1.dy -= impulse * ny;
            c2.dx += impulse * nx;
            c2.dy += impulse * ny;

            // Push circles apart to avoid overlap
            const overlap = c1.radius + c2.radius - distance;
            const correction = overlap / 2;

            c1.x += correction * nx;
            c1.y += correction * ny;
            c2.x -= correction * nx;
            c2.y -= correction * ny;
        }

        // Remove circles when the black dot collides with them
        function checkBlackDotCollisions() {
            for (let i = circles.length - 1; i >= 0; i--) {
                if (circlesCollide(blackDot, circles[i])) {
                    const removedColor = circles[i].color; // Capture the color
                    circles.splice(i, 1); // Remove the circle
                    colorCount[removedColor]++; // Increase the count for that color
                    updateCounter(); // Update the counter display
                    updateBackgroundColor(removedColor); // Change background color to the color of the eaten circle
                }
            }
        }

        // Update counter display
        function updateCounter() {
            const colorEntries = counterBox.children;
            circleColors.forEach((color, index) => {
                const count = colorCount[color];
                const countText = colorEntries[index].children[1]; // Get the count span
                countText.textContent = count; // Update the count text
            });
        }

        // Update canvas background color
        function updateBackgroundColor(color) {
            canvas.style.backgroundColor = color;
        }

        // Independent black dot
        const blackDot = {
            x: canvas.width / 2,
            y: canvas.height / 2,
            radius: 15,
            color: "black",
            dx: (Math.random() - 0.5) * 4,
            dy: (Math.random() - 0.5) * 4
        };

        function moveCircles() {
            circles.forEach((circle, index) => {
                circle.x += circle.dx;
                circle.y += circle.dy;

                // Bounce off walls
                if (circle.x - circle.radius < 0 || circle.x + circle.radius > canvas.width) {
                    circle.dx *= -1;
                }
                if (circle.y - circle.radius < 0 || circle.y + circle.radius > canvas.height) {
                    circle.dy *= -1;
                }

                // Check for collisions with other circles
                for (let j = index + 1; j < circles.length; j++) {
                    if (circlesCollide(circle, circles[j])) {
                        resolveCollision(circle, circles[j]);
                    }
                }
            });
        }

        function moveBlackDot() {
            blackDot.x += blackDot.dx;
            blackDot.y += blackDot.dy;

            if (blackDot.x - blackDot.radius < 0 || blackDot.x + blackDot.radius > canvas.width) {
                blackDot.dx *= -1;
            }
            if (blackDot.y - blackDot.radius < 0 || blackDot.y + blackDot.radius > canvas.height) {
                blackDot.dy *= -1;
            }
        }

        function animate() {
            context.clearRect(0, 0, canvas.width, canvas.height);

            // Move and check black dot
            moveBlackDot();
            checkBlackDotCollisions();

            // Move colored circles
            moveCircles();

            // Draw black dot
            context.beginPath();
            context.arc(blackDot.x, blackDot.y, blackDot.radius, 0, Math.PI * 2);
            context.fillStyle = blackDot.color;
            context.fill();

            // Draw colored circles
            circles.forEach(circle => {
                context.beginPath();
                context.arc(circle.x, circle.y, circle.radius, 0, Math.PI * 2);
                context.fillStyle = circle.color;
                context.fill();
            });

            requestAnimationFrame(animate);
        }

        // Initialize counter and start animation
        initializeCounter();
        animate();
    </script>
</body>
</html>