Highway Racer Physics Engine

{"name":"Highway Racer Physics Engine","description":"Dive into the world of physics with a simplified car driving engine. Build a highway terrain and simulate realistic car movements and interactions. This project offers a fun way to learn programming by driving virtual cars on a highway using physics principles. Perfect for beginners who want to explore the basics of game development and physics simulations.","photo":null,"view_count":1,"fork_count":0,"expires_at":null,"created_at":"2025-11-13T16:27:15.709025Z","updated_at":"2025-11-13T16:27:15.709026Z","user_id":839,"status":"PRIVATE","parent_id":null,"id":10523,"user":{"photo":null,"email":"lvic_stu28@sdcoestudents.net","recess_id":null,"created_at":"2025-10-13T17:35:21.906801Z","reset_token":null,"stripe_customer_id":null,"seats":0,"username":"lvic_stu28","id":839,"password_hash":"$2b$12$zH3KWgTv93IwGrROZx5tCO422dJWsTdM3EdYguX1bNE06wchb9Spu","updated_at":"2025-10-13T17:35:21.906807Z","reset_token_expiry":null,"subscription_status":null},"code":{"script.js":"let Engine = Matter.Engine,\n Render = Matter.Render,\n World = Matter.World,\n Bodies = Matter.Bodies,\n Body = Matter.Body;\n\nlet engine;\n\nlet world;\n\nlet car;\n\nfunction setup() {\n createCanvas(windowWidth, windowHeight);\n background(135, 206, 235);\n\n // Create an engine\n engine = Engine.create();\n world = engine.world;\n\n // Create a car body\n car = Bodies.rectangle(width / 2, height / 2, 50, 30, { friction: 0.1 });\n\n // Add car to the world\n World.add(world, car);\n\n // Set gravity to zero for top-down view\n engine.world.gravity.y = 0;\n}\n\nfunction draw() {\n background(135, 206, 235);\n\n // Update the physics engine\n Engine.update(engine);\n\n // Check boundaries to prevent the car from going off-screen\n const halfWidth = 25; // Half of the car's width\n const halfHeight = 15; // Half of the car's height\n\n if (car.position.x < halfWidth) {\n Body.setPosition(car, { x: halfWidth, y: car.position.y }); // Reset car position\n Body.setVelocity(car, { x: 0, y: car.velocity.y }); // Stop horizontal movement\n }\n else if (car.position.x > width - halfWidth) {\n Body.setPosition(car, { x: width - halfWidth, y: car.position.y }); // Reset car position\n Body.setVelocity(car, { x: 0, y: car.velocity.y }); // Stop horizontal movement\n }\n\n if (car.position.y < halfHeight) {\n Body.setPosition(car, { x: car.position.x, y: halfHeight }); // Reset car position\n Body.setVelocity(car, { x: car.velocity.x, y: 0 }); // Stop vertical movement\n }\n else if (car.position.y > height - halfHeight) {\n Body.setPosition(car, { x: car.position.x, y: height - halfHeight }); // Reset car position\n Body.setVelocity(car, { x: car.velocity.x, y: 0 }); // Stop vertical movement\n }\n\n // Draw the car\n drawCar();\n\n // Handle inputs\n handleInputs();\n}\n\nfunction drawCar() {\n push();\n translate(car.position.x, car.position.y);\n rotate(car.angle);\n rectMode(CENTER);\n fill(255, 0, 0);\n rect(0, 0, 50, 30); // Car is represented as a rectangle\n pop();\n}\n\nfunction handleInputs() {\n if (keyIsDown(UP_ARROW)) {\n Body.applyForce(car, car.position, { x: 0.001 * cos(car.angle), y: 0.001 * sin(car.angle) });\n }\n\n if (keyIsDown(DOWN_ARROW)) {\n Body.applyForce(car, car.position, { x: -0.001 * cos(car.angle), y: -0.001 * sin(car.angle) });\n }\n\n // Reduce angular velocity change for smoother steering\n const steeringSensitivity = 0.0015; // Smaller value for less sensitivity\n if (keyIsDown(LEFT_ARROW)) {\n Body.setAngularVelocity(car, car.angularVelocity - steeringSensitivity);\n }\n\n if (keyIsDown(RIGHT_ARROW)) {\n Body.setAngularVelocity(car, car.angularVelocity + steeringSensitivity);\n }\n}\n\n","style.css":"body { margin: 0; } canvas { display: block; }","index.html":"\n\n\n \n \n Highway Racer Physics Engine\n \n \n \n \n\n\n \n\n"},"chat_history":[{"message":"Make a physics engine for driving cars. make the terrain a highway","project_id":10523,"created_at":"2025-11-13T16:27:15.722656Z","output_tokens":null,"sender":"human","code_id":293096,"deleted":0,"input_tokens":null,"id":179285},{"message":"Let's get started!\n Errors:\n","project_id":10523,"created_at":"2025-11-13T16:27:36.959430Z","output_tokens":null,"sender":"client_script","code_id":293096,"deleted":0,"input_tokens":null,"id":179292},{"message":"That sounds like a fun project! We can create a simple highway driving simulation using physics. To get started, could you tell me more about what you envision for the project? For example, what kind of features do you want in your car physics engine? Do you want to simulate things like acceleration, braking, and turning? Would you like to have other cars or obstacles on the highway?","project_id":10523,"created_at":"2025-11-13T16:27:37.385149Z","output_tokens":96,"sender":"ai","code_id":293096,"deleted":0,"input_tokens":2617,"id":179293},{"message":"I want the up and down arrows to control throttle, and left/right arrows for steering. make it top down. ","project_id":10523,"created_at":"2025-11-13T16:28:34.276171Z","output_tokens":null,"sender":"human","code_id":293096,"deleted":0,"input_tokens":null,"id":179316},{"message":"Great! We can definitely set up a top-down view for a highway car driving simulation. Since you want to control the car with the arrow keys, we'll need to set up some basic physics for acceleration, braking, and turning.\n\nFirst, we can use Matter.js for handling the physics of the car. Matter.js is a powerful 2D physics engine that will help us simulate realistic car movements. Would you like to use Matter.js for this project?","project_id":10523,"created_at":"2025-11-13T16:28:34.728375Z","output_tokens":107,"sender":"ai","code_id":293096,"deleted":0,"input_tokens":2637,"id":179317},{"message":"yes, matter is fine","project_id":10523,"created_at":"2025-11-13T16:29:00.392569Z","output_tokens":null,"sender":"human","code_id":293096,"deleted":0,"input_tokens":null,"id":179321},{"message":"Awesome! Let's integrate Matter.js to help us simulate the car physics. We'll start by setting up a basic car and making it respond to keyboard inputs for throttle and steering.\n\nFirst, we'll modify your `script.js` to initialize Matter.js and create a simple car object. Then, we'll handle the keyboard inputs for controlling the car. Let's start with setting up the physics engine and the car:\n\n```javascript\n// script.js\n// Matter.js module aliases\nlet Engine = Matter.Engine,\n Render = Matter.Render,\n World = Matter.World,\n Bodies = Matter.Bodies,\n Body = Matter.Body;\n\n// Engine and world setup\nlet engine;\nlet world;\nlet car;\n\nfunction setup() {\n createCanvas(windowWidth, windowHeight);\n background(135, 206, 235);\n\n // Create an engine\n engine = Engine.create();\n world = engine.world;\n\n // Create a car body\n car = Bodies.rectangle(width / 2, height / 2, 50, 30, { friction: 0.1 });\n\n // Add car to the world\n World.add(world, car);\n\n // Set gravity to zero for top-down view\n engine.world.gravity.y = 0;\n}\n\nfunction draw() {\n background(135, 206, 235);\n\n // Update the physics engine\n Engine.update(engine);\n\n // Draw the car\n drawCar();\n\n // Handle inputs\n handleInputs();\n}\n\nfunction drawCar() {\n push();\n translate(car.position.x, car.position.y);\n rotate(car.angle);\n rectMode(CENTER);\n fill(255, 0, 0);\n rect(0, 0, 50, 30); // Car is represented as a rectangle\n pop();\n}\n\nfunction handleInputs() {\n if (keyIsDown(UP_ARROW)) {\n Body.applyForce(car, car.position, { x: 0.001 * cos(car.angle), y: 0.001 * sin(car.angle) });\n }\n\n if (keyIsDown(DOWN_ARROW)) {\n Body.applyForce(car, car.position, { x: -0.001 * cos(car.angle), y: -0.001 * sin(car.angle) });\n }\n\n if (keyIsDown(LEFT_ARROW)) {\n Body.setAngularVelocity(car, car.angularVelocity - 0.01);\n }\n\n if (keyIsDown(RIGHT_ARROW)) {\n Body.setAngularVelocity(car, car.angularVelocity + 0.01);\n }\n}\n```\n\n### Explanation:\n- **Matter.js Setup**: We've initialized the Matter.js engine and world.\n- **Car Creation**: The car is represented as a rectangle body in the engine, added to the world.\n- **Gravity**: Set gravity to zero for a top-down view.\n- **Drawing**: We use p5.js to draw the car on the canvas.\n- **Controls**: The `handleInputs` function applies force to the car for acceleration and braking, and sets angular velocity for steering.\n\nTry this code out and let me know how it runs! If there's anything specific you'd like to tweak or add, feel free to let me know!","project_id":10523,"created_at":"2025-11-13T16:29:00.836136Z","output_tokens":644,"sender":"ai","code_id":293096,"deleted":0,"input_tokens":2617,"id":179322},{"message":"make the physics easier to steer, the car feels like it is letting you steer too sensitivesly","project_id":10523,"created_at":"2025-11-13T16:31:20.409097Z","output_tokens":null,"sender":"human","code_id":293340,"deleted":0,"input_tokens":null,"id":179381},{"message":"To make the steering of the car feel less sensitive, we can adjust the angular velocity changes in the `handleInputs` function. By reducing the amount we change the angular velocity when the left or right arrow keys are pressed, we can create a smoother and less sensitive steering experience.\n\nLet's modify the `handleInputs` function to decrease the steering sensitivity:\n\n```javascript\n// script.js\nfunction handleInputs() {\n if (keyIsDown(UP_ARROW)) {\n Body.applyForce(car, car.position, { x: 0.001 * cos(car.angle), y: 0.001 * sin(car.angle) });\n }\n\n if (keyIsDown(DOWN_ARROW)) {\n Body.applyForce(car, car.position, { x: -0.001 * cos(car.angle), y: -0.001 * sin(car.angle) });\n }\n\n // Reduce angular velocity change for smoother steering\n const steeringSensitivity = 0.005; // Smaller value for less sensitivity\n if (keyIsDown(LEFT_ARROW)) {\n Body.setAngularVelocity(car, car.angularVelocity - steeringSensitivity);\n }\n\n if (keyIsDown(RIGHT_ARROW)) {\n Body.setAngularVelocity(car, car.angularVelocity + steeringSensitivity);\n }\n}\n```\n\n### Explanation:\n- **`steeringSensitivity`**: A new variable is defined to control how much the angular velocity changes when the left or right arrow keys are pressed. A smaller value (0.005) makes the steering less sensitive.\n\nPlease replace the existing `handleInputs` function with this updated code. Try it out and let me know how it feels! If you want to adjust the sensitivity further, we can tweak the `steeringSensitivity` value.","project_id":10523,"created_at":"2025-11-13T16:31:20.856444Z","output_tokens":383,"sender":"ai","code_id":293340,"deleted":0,"input_tokens":3012,"id":179383},{"message":"make the car not go offscreen","project_id":10523,"created_at":"2025-11-13T16:34:45.495243Z","output_tokens":null,"sender":"human","code_id":293425,"deleted":0,"input_tokens":null,"id":179467},{"message":"To prevent the car from going off-screen, we can add boundary checks in the `draw()` function. If the car's position is near the edges of the canvas, we can reset its position or apply a limit to its movement.\n\nLet's modify the `draw()` function to include boundary checks:\n\n```javascript\n// script.js\nfunction draw() {\n background(135, 206, 235);\n\n // Update the physics engine\n Engine.update(engine);\n\n // Check boundaries to prevent the car from going off-screen\n const halfWidth = 25; // Half of the car's width\n const halfHeight = 15; // Half of the car's height\n\n if (car.position.x < halfWidth) {\n Body.setPosition(car, { x: halfWidth, y: car.position.y }); // Reset car position\n Body.setVelocity(car, { x: 0, y: car.velocity.y }); // Stop horizontal movement\n } \n else if (car.position.x > width - halfWidth) {\n Body.setPosition(car, { x: width - halfWidth, y: car.position.y }); // Reset car position\n Body.setVelocity(car, { x: 0, y: car.velocity.y }); // Stop horizontal movement\n }\n\n if (car.position.y < halfHeight) {\n Body.setPosition(car, { x: car.position.x, y: halfHeight }); // Reset car position\n Body.setVelocity(car, { x: car.velocity.x, y: 0 }); // Stop vertical movement\n } \n else if (car.position.y > height - halfHeight) {\n Body.setPosition(car, { x: car.position.x, y: height - halfHeight }); // Reset car position\n Body.setVelocity(car, { x: car.velocity.x, y: 0 }); // Stop vertical movement\n }\n\n // Draw the car\n drawCar();\n\n // Handle inputs\n handleInputs();\n}\n```\n\n### Explanation:\n- **Boundary Checks**: We check if the car's position is less than half its width (for left) or greater than the canvas width minus half its width (for right). Similarly, we check for the vertical boundaries.\n- **Reset Position**: If the car reaches a boundary, we reset its position back within the screen limits.\n- **Stop Movement**: We set the velocity to zero in the direction that would push it off-screen to stop any movement.\n\nPlease replace the existing `draw()` function with this updated code. Try running it again and let me know if the car stays on-screen now!","project_id":10523,"created_at":"2025-11-13T16:34:45.955875Z","output_tokens":549,"sender":"ai","code_id":293425,"deleted":0,"input_tokens":3027,"id":179468}],"assets":[],"messages_sent":5,"comments":[],"steps":[]}