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<body>
<!-- Canvas element to display the game -->
<canvas id="gameCanvas" width="800" height="400"></canvas>
<!-- Element to show the player's score -->
<div id="score">Score: 0</div>
<!-- JavaScript code for the game logic -->
<script>
// Dino character's properties and initial values
const dino = {
x: 50, // Dino's starting horizontal position
y: canvas.height - 50, // Dino's starting vertical position
width: 50, // Dino's width
height: 50, // Dino's height
color: "#00F", // Dino's color (blue)
speed: 5, // Dino's movement speed
isJumping: false, // Flag to check if the dino is jumping
jumpHeight: 100, // Maximum jump height
jumpCount: 0, // Jump counter
};
// Array to store obstacle information
const obstacles = [];
// Initial score value
let score = 0;
// Minimum gap between obstacles
const minimumObstacleGap = 75;
// Counter to increase the gap between obstacles
let increaseGap = 0;
// Function to continuously update and render the game
function gameLoop() {
update(); // Update game logic
draw(); // Render game elements
increaseGap++; // Increment the obstacle gap counter
requestAnimationFrame(gameLoop); // Request the next animation frame
}
// Function to update the game logic
function update() {
moveDino(); // Update dino's position
moveObstacles(); // Update obstacle positions
checkCollisions(); // Check for collisions
}
// Function to move the dino
function moveDino() {
// Check if the dino is jumping
if (dino.isJumping) {
// Move the dino upwards during the jump
if (dino.jumpCount < dino.jumpHeight) {
dino.y -= 5;
dino.jumpCount += 5;
} else {
dino.isJumping = false; // End the jump when the max height is reached
}
} else if (dino.y < canvas.height - dino.height) {
dino.y += 5; // Move the dino downwards after the jump
}
updateScore(); // Update the score after a successful jump
}
// Function to move and create obstacles
function moveObstacles() {
// Check if it's time to create a new obstacle
if (increaseGap > minimumObstacleGap && Math.random() > 0.005) {
increaseGap = 0; // Reset the gap counter
// Create a new obstacle and add it to the array
const obstacle = {
x: canvas.width,
y: canvas.height - 50,
width: 50,
height: 50,
color: "#F00", // Obstacle color (red)
speed: 5,
};
obstacles.push(obstacle);
}
// Move existing obstacles and remove those that are out of the screen
for (let i = 0; i < obstacles.length; i++) {
obstacles[i].x -= obstacles[i].speed;
// Check if the obstacle is out of the screen
if (obstacles[i].x + obstacles[i].width < 0) {
obstacles.splice(i, 1); // Remove the obstacle from the array
i--; // Adjust the loop counter
score++; // Increase the player's score
}
}
}
// Function to check for collisions between the dino and obstacles
function checkCollisions() {
// Array to store the dino's collision points
const dinoPoints = [
{ x: dino.x, y: dino.y + dino.height }, // Bottom left corner
{ x: dino.x + dino.width / 2, y: dino.y }, // Top center
{ x: dino.x + dino.width, y: dino.y + dino.height }, // Bottom right corner
];
// Loop through obstacles to check for collisions
for (let i = 0; i < obstacles.length; i++) {
// Array to store the current obstacle's collision points
const obstaclePoints = [
{ x: obstacles[i].x, y: obstacles[i].y + obstacles[i].height }, // Bottom left corner
{ x: obstacles[i].x + obstacles[i].width / 2, y: obstacles[i].y }, // Top center
{ x: obstacles[i].x + obstacles[i].width, y: obstacles[i].y + obstacles[i].height }, // Bottom right corner
];
// Check collision using point-in-triangle algorithm
if (
pointInTriangle(dinoPoints[0].x, dinoPoints[0].y, ...obstaclePoints) ||
pointInTriangle(dinoPoints[1].x, dinoPoints[1].y, ...obstaclePoints) ||
pointInTriangle(dinoPoints[2].x, dinoPoints[2].y, ...obstaclePoints)
) {
alert("Game Over! Your Score: " + score);
resetGame(); // Reset the game after a collision
return;
}
}
}
// Function to check if a point is inside a triangle
function pointInTriangle(px, py, p1, p2, p3) {
// Helper function to determine the sign of a point relative to a line
function sign(p1, p2, p3) {
return (p1.x - p3.x) * (p2.y - p3.y) - (p2.x - p3.x) * (p1.y - p3.y);
}
// Check signs for each corner of the triangle
const b1 = sign({ x: px, y: py }, p1, p2) < 0;
const b2 = sign({ x: px, y: py }, p2, p3) < 0;
const b3 = sign({ x: px, y: py }, p3, p1) < 0;
// Return true if the point is inside the triangle
return b1 === b2 && b2 === b3;
}
// Function to reset the game to its initial state
function resetGame() {
dino.x = 50;
dino.y = canvas.height - 50;
dino.isJumping = false;
dino.jumpCount = 0;
obstacles.length = 0; // Clear the obstacles array
score = 0; // Reset the player's score
}
// Function to render game elements on the canvas
function draw() {
ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear the canvas
drawDino(); // Render the dino
drawObstacles(); // Render the obstacles
}
// Function to render the dino on the canvas
function drawDino() {
ctx.fillStyle = dino.color; // Set dino color
ctx.fillRect(dino.x, dino.y, dino.width, dino.height); // Draw dino rectangle
}
// Function to render obstacles on the canvas
function drawObstacles() {
for (let i = 0; i < obstacles.length; i++) {
ctx.fillStyle = obstacles[i].color; // Set obstacle color
// Draw a triangle obstacle
ctx.beginPath();
ctx.moveTo(obstacles[i].x, obstacles[i].y + obstacles[i].height); // Bottom left corner
ctx.lineTo(obstacles[i].x + obstacles[i].width / 2, obstacles[i].y); // Top center
ctx.lineTo(obstacles[i].x + obstacles[i].width, obstacles[i].y + obstacles[i].height); // Bottom right corner
ctx.closePath();
ctx.fill();
}
}
// Event listener for the up arrow key to make the dino jump
window.addEventListener("keydown", (e) => {
// Check if the up arrow key is pressed and the dino is not already jumping
if (e.key === "ArrowUp" && !dino.isJumping && dino.y === canvas.height - dino.height) {
dino.isJumping = true; // Set the jump flag to true
dino.jumpCount = 0; // Reset the jump counter
}
});
// Function to update and display the player's score
function updateScore() {
const scoreElement = document.getElementById("score"); // Get the score element
scoreElement.textContent = "Score: " + score; // Update the score display
}
gameLoop(); // Start the game loop
</script>
</body>
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