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script.js
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script.js
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// CONSTANTS
var CANVAS_WIDTH = 1000;
var CANVAS_HEIGHT = 600;
var NANONAUT_WIDTH = 180;
var NANONAUT_HEIGHT = 230;
var GROUND_Y = 540;
var NANONAUT_Y_ACCELERATION = 1;
var nanonautYSpeed = 0;
var SPACE_KEYCODE = 32;
var spaceKeyIsPressed = false;
var NANONAUT_JUMP_SPEED = 20;
var nanonautIsInTheAir = false;
var NANONAUT_X_SPEED = 5;
var cameraX = 0;
var cameraY = 0;
var BACKGROUND_WIDTH = 1000;
var NANONAUT_NR_FRAMES_PER_ROW = 5;
var NANONAUT_NR_ANIMATION_FRAMES = 7;
var nanonautFrameNr = 0;
var NANONAUT_ANIMATION_SPEED = 3;
var gameFrameCounter = 0;
var ROBOT_WIDTH = 141;
var ROBOT_HEIGHT = 139;
var ROBOT_NR_ANIMATION_FRAMES = 9;
var ROBOT_ANIMATION_SPEED = 5;
var ROBOT_X_SPEED = 4;
var MIN_DISTANCE_BETWEEN_ROBOTS = 400;
var MAX_DISTANCE_BETWEEN_ROBOTS = 1200;
var MAX_ACTIVE_ROBOTS = 3;
var screenshake = false;
var SCREENSHAKE_RADIUS = 16;
var NANONAUT_MAX_HEALTH = 100;
var nanonautHealth = NANONAUT_MAX_HEALTH;
var PLAY_GAME_MODE = 0;
var GAME_OVER_GAME_MODE = 1;
var gameMode = PLAY_GAME_MODE;
// SETUP
var canvas = document.createElement('canvas');
var c = canvas.getContext('2d');
canvas.width = CANVAS_WIDTH;
canvas.height = CANVAS_HEIGHT;
document.getElementById("wrap").appendChild(canvas);
var nanonautImage = new Image();
nanonautImage.src = 'animatedNanonaut.png';
var nanonautSpriteSheet = {
nrFramesPerRow: 5,
spriteWidth: NANONAUT_WIDTH,
spriteHeight: NANONAUT_HEIGHT,
image: nanonautImage
};
var nanonautCollisionRectangle = {
xOffset: 60,
yOffset: 20,
width: 50,
height: 200
};
var robotCollisionRectangle = {
xOffset: 50,
yOffset: 20,
width: 50,
height: 100
};
var robotImage = new Image();
robotImage.src = 'animatedRobot.png';
var robotSpriteSheet = {
nrFramesPerRow: 3,
spriteWidth: ROBOT_WIDTH,
spriteHeight: ROBOT_HEIGHT,
image: robotImage
};
var robotData = [];
var nanonautX = CANVAS_WIDTH / 2;
var nanonautY = GROUND_Y - NANONAUT_HEIGHT;
var backgroundImage = new Image();
backgroundImage.src = 'background.png';
window.addEventListener("load", start);
function start() {
window.requestAnimationFrame(mainLoop);
};
window.addEventListener("keydown", onKeyDown);
window.addEventListener("keyup", onKeyUp);
window.addEventListener("click", onClick);
var Bush1Image = new Image();
Bush1Image.src = 'bush1.png';
var Bush2Image = new Image();
Bush2Image.src = 'bush2.png';
var bushData = generateBushes()
function generateBushes() {
var generatedBushData = [];
var bushX = 0;
//for (var i = 0; i < 10; i++)
while (bushX < (2 * CANVAS_WIDTH)) {
var bushImage;
if (Math.random() >= 0.5) {
bushImage = Bush1Image;
}
else {
bushImage = Bush2Image;
}
generatedBushData.push({
x: bushX,
y: 80 + Math.random() * 20,
image: bushImage
});
bushX += 150 + Math.random() * 200;
}
return generatedBushData;
}
// MAIN LOOP
function mainLoop() {
update();
draw();
window.requestAnimationFrame(mainLoop);
};
// PLAYER INPUT
function onKeyDown(event) {
if (event.keyCode === SPACE_KEYCODE) {
spaceKeyIsPressed = true;
}
};
function onKeyUp(event) {
if (event.keyCode === SPACE_KEYCODE) {
spaceKeyIsPressed = false;
}
};
function onClick(event) {
spaceKeyIsPressed = true;
setTimeout(function () {
spaceKeyIsPressed = false;
}, 50);
};
// UPDATING
function update() {
if (gameMode != PLAY_GAME_MODE) return;
nanonautX = nanonautX + NANONAUT_X_SPEED;
if (spaceKeyIsPressed && !nanonautIsInTheAir) {
nanonautYSpeed = -NANONAUT_JUMP_SPEED;
nanonautIsInTheAir = true;
}
nanonautY = nanonautY + nanonautYSpeed;
nanonautYSpeed = nanonautYSpeed + NANONAUT_Y_ACCELERATION;
if (nanonautY > (GROUND_Y - NANONAUT_HEIGHT)) {
nanonautY = GROUND_Y - NANONAUT_HEIGHT;
nanonautYSpeed = 0;
nanonautIsInTheAir = false;
}
cameraX = nanonautX - 150;
gameFrameCounter = gameFrameCounter + 1;
if ((gameFrameCounter % NANONAUT_ANIMATION_SPEED) === 0) {
nanonautFrameNr = nanonautFrameNr + 1;
}
if (nanonautFrameNr >= NANONAUT_NR_ANIMATION_FRAMES) {
nanonautFrameNr = 0;
}
for (var i = 0; i < bushData.length; i++) {
if ((bushData[i].x - cameraX) < -CANVAS_WIDTH) {
bushData[i].x += (2 * CANVAS_WIDTH) + 150;
}
}
screenshake = false;
var nanonautTouchedARobot = updateRobots();
if (nanonautTouchedARobot) {
screenshake = true;
if (nanonautHealth > 0) nanonautHealth -= 1;
}
if (nanonautHealth <= 0) {
gameMode = GAME_OVER_GAME_MODE;
screenshake = false;
}
}
function updateRobots() {
var nanonautTouchedARobot = false;
for (var i = 0; i < robotData.length; i++) {
if (doesNanonautOverlapRobot(
nanonautX + nanonautCollisionRectangle.xOffset,
nanonautY + nanonautCollisionRectangle.yOffset,
nanonautCollisionRectangle.width,
nanonautCollisionRectangle.height,
robotData[i].x + robotCollisionRectangle.xOffset,
robotData[i].y + robotCollisionRectangle.yOffset,
robotCollisionRectangle.width,
robotCollisionRectangle.height
)) {
nanonautTouchedARobot = true;
}
robotData[i].x -= ROBOT_X_SPEED;
if ((gameFrameCounter % ROBOT_ANIMATION_SPEED) === 0) {
robotData[i].frameNr = robotData[i].frameNr + 1;
if (robotData[i].frameNr >= ROBOT_NR_ANIMATION_FRAMES) {
robotData[i].frameNr = 0;
}
}
}
var robotIndex = 0;
while (robotIndex < robotData.length) {
if (robotData[robotIndex].x < cameraX - ROBOT_WIDTH) {
robotData.splice(robotIndex, 1);
}
else {
robotIndex += 1;
}
}
if (robotData.length < MAX_ACTIVE_ROBOTS) {
var lastRobotX = CANVAS_WIDTH;
if (robotData.length > 0) {
var lastRobotX = robotData[robotData.length - 1].x;
}
var newRobotX = lastRobotX + MIN_DISTANCE_BETWEEN_ROBOTS + Math.random() * (MAX_DISTANCE_BETWEEN_ROBOTS - MIN_DISTANCE_BETWEEN_ROBOTS);
robotData.push({
x: newRobotX,
y: GROUND_Y - ROBOT_HEIGHT,
frameNr: 0
});
}
return nanonautTouchedARobot;
}
function doesNanonautOverlapRobotAlongOneAxis(nanonautNearX, nanonautFarX,
robotNearX, robotFarX) {
var nanonautOverlapsNearRobotEdge = (nanonautFarX >= robotNearX) &&
(nanonautFarX <= robotFarX);
var nanonautOverlapsFarRobotEdge = (nanonautNearX >= robotNearX) &&
(nanonautNearX <= robotFarX);
var nanonautOverlapsEntireRobot = (nanonautNearX <= robotNearX) &&
(nanonautFarX >= robotFarX);
return nanonautOverlapsNearRobotEdge || nanonautOverlapsFarRobotEdge ||
nanonautOverlapsEntireRobot;
}
function doesNanonautOverlapRobot(nanonautX, nanonautY, nanonautWidth,
nanonautHeight, robotX, robotY, robotWidth, robotHeight) {
var nanonautOverlapsRobotOnXAxis = doesNanonautOverlapRobotAlongOneAxis(
nanonautX,
nanonautX + nanonautWidth,
robotX,
robotX + robotWidth
);
var nanonautOverlapsRobotOnYAxis = doesNanonautOverlapRobotAlongOneAxis(
nanonautY,
nanonautY + nanonautHeight,
robotY,
robotY + robotHeight
);
return nanonautOverlapsRobotOnXAxis && nanonautOverlapsRobotOnYAxis;
};
// DRAWING
function draw() {
var shakenCameraX = cameraX;
var shakenCameraY = cameraY;
if (screenshake) {
shakenCameraX += (Math.random() - .5) * SCREENSHAKE_RADIUS;
shakenCameraY += (Math.random() - .5) * SCREENSHAKE_RADIUS;
}
c.fillStyle = 'LightSkyBlue';
c.fillRect(0, 0, CANVAS_WIDTH, GROUND_Y - 40);
var backgroundX = - (cameraX % BACKGROUND_WIDTH);
c.drawImage(backgroundImage, backgroundX, -210);
c.drawImage(backgroundImage, backgroundX + BACKGROUND_WIDTH, -210);
c.fillStyle = 'ForestGreen';
c.fillRect(0, GROUND_Y - 40, CANVAS_WIDTH, CANVAS_HEIGHT - GROUND_Y + 40);
for (var i = 0; i < bushData.length; i++) {
c.drawImage(bushData[i].image, bushData[i].x -
shakenCameraX, GROUND_Y - bushData[i].y - shakenCameraY);
}
for (var i = 0; i < robotData.length; i++) {
drawAnimatedSprite(robotData[i].x - cameraX,
robotData[i].y - cameraY, robotData[i].frameNr, robotSpriteSheet);
}
drawAnimatedSprite(nanonautX - cameraX, nanonautY - cameraY,
nanonautFrameNr, nanonautSpriteSheet);
var nanonautSpriteSheetRow = Math.floor(nanonautFrameNr / NANONAUT_NR_FRAMES_PER_ROW);
var nanonautSpriteSheetColumn = nanonautFrameNr % NANONAUT_NR_FRAMES_PER_ROW;
var nanonautSpriteSheetX = nanonautSpriteSheetColumn * NANONAUT_WIDTH;
var nanonautSpriteSheetY = nanonautSpriteSheetRow * NANONAUT_HEIGHT;
c.drawImage(nanonautImage, nanonautSpriteSheetX, nanonautSpriteSheetY, NANONAUT_WIDTH, NANONAUT_HEIGHT, nanonautX - cameraX, nanonautY - cameraY, NANONAUT_WIDTH, NANONAUT_HEIGHT);
function drawAnimatedSprite(screenX, screenY, frameNr, spriteSheet) {
var spriteSheetRow = Math.floor(frameNr / spriteSheet.nrFramesPerRow);
var spriteSheetColumn = frameNr % spriteSheet.nrFramesPerRow;
var spriteSheetX = spriteSheetColumn * spriteSheet.spriteWidth;
var spriteSheetY = spriteSheetRow * spriteSheet.spriteHeight;
c.drawImage(
spriteSheet.image,
spriteSheetX, spriteSheetY,
spriteSheet.spriteWidth,
spriteSheet.spriteHeight,
screenX, screenY,
spriteSheet.spriteWidth,
spriteSheet.spriteHeight,
);
}
var nanonautDistance = nanonautX / 100;
c.fillStyle = "black";
c.font = "48px Urbanist";
c.fillText(nanonautDistance.toFixed(0) + 'm', 860, 40);
c.fillStyle = 'red';
c.fillRect(310, 10, nanonautHealth / NANONAUT_MAX_HEALTH * 380, 20);
c.strokeStyle = 'black';
c.strokeRect(310, 10, 380, 20);
if (gameMode == GAME_OVER_GAME_MODE) {
c.fillStyle = "black";
c.font = "95px Indie Flower";
c.fillText("Game Over!", 280, 200);
c.fillStyle = "white";
c.font = "95px Urbanist";
c.fillText("You ran " + nanonautDistance.toFixed(0) + "m", 300, 300);
document.getElementById("replay").style.display = "block";
}
};
var loader = document.getElementById("loader");
var blacker = document.getElementById("container");
var body = document.getElementsByTagName("body");
function onloadFunction() {
loader.style.animation = "none";
blacker.style.display = "none";
};