You are being fed up with the JavaScript games and trying to find out how to build Web-based JavaScript games? This JavaScript article tutorial may be a valuable reference source for you in this case.
This JavaScript game making tutorial guides us use a JavaScript game framework - Crafty - to create a simple JavaScript RPG game. This JavaScript RPG game is quite simple but it's so awesome with beautiful graphics, and its gameplay is not too easy to make us feel boredom. Basically, we need to do some necessary tasks such as define the characters, build JavaScript game scenes, create gameplay, making game's animations and combine them into a unified result.
The inner post page will show you all detailed instructions and comments, as well as demo to play with full JavaScript source code for downloading.
- Demo
- Enlarge
- Reload
- New window
Free iPage Web Hosting for First Year NOW
If you're still looking for a reliable web host provider with affordable rates, why you don't take a little of time to try iPage, only with $1.89/month, included $500+ Free Extra Credits for the payment of 24 months ($45)?
Over 1,000,000+ existisng customers can not be wrong, definitely you're not, too! More important, when you register the web hosting at iPage through our link, we're going to be happy for resending a full refund to you. That's awesome! You should try iPage web hosting for FREE now! And contact us for anything you need to know about iPage.
Sprites
Remember that sprite map from earlier? It’s time to use that in the game and get some visuals here. Crafty has an inbuilt method to splice sprite maps into individual components that can be applied to any 2D entity.
window.onload = function() {
// Start crafty
Crafty.init(50, 400, 320);
Crafty.canvas();
// Turn the sprite map into usable components
Crafty.sprite(16, "sprite.png", {
grass1: [0,0],
grass2: [1,0],
grass3: [2,0],
grass4: [3,0],
flower: [0,1],
bush1: [0,2],
bush2: [1,2],
player: [0,3]
});
// The loading screen that will display while our assets load
Crafty.scene("loading", function() {
// Load takes an array of assets and a callback when complete
Crafty.load(["sprite.png"], function() {
Crafty.scene("main"); //when everything is loaded, run the main scene
});
// Black background with some loading text
Crafty.background("#000");
Crafty.e("2D, DOM, text").attr({w: 100, h: 20, x: 150, y: 120})
.text("Loading")
.css({"text-align": "center"});
});
// Automatically play the loading scene
Crafty.scene("loading");
};
The first argument is the tile size (in our case is 16 pixels by 16 pixels). This defaults to 1 if left out. The next argument is the path to the sprite map. Finally the last argument is an object where the key is the label and the value is an array for where the particular sprite is located in the image.
The values are multiplied by 16 so you need only give the amount of tiles from the top left. If a sprite takes up a width or height greater than one tile, simply add it to the array following this format:
[x, y, w, h]
You may notice that not all of the sprites in the sprite map have been labelled. This is because the sprites form an animation which we will add later.
window.onload = function() {
// Start crafty
Crafty.init(50, 400, 320);
Crafty.canvas();
// Turn the sprite map into usable components
Crafty.sprite(16, "sprite.png", {
grass1: [0,0],
grass2: [1,0],
grass3: [2,0],
grass4: [3,0],
flower: [0,1],
bush1: [0,2],
bush2: [1,2],
player: [0,3]
});
// Method to randomy generate the map
function generateWorld() {
// Generate the grass along the x-axis
for (var i = 0; i < 25; i++) {
// Generate the grass along the y-axis
for (var j = 0; j < 20; j++) {
grassType = Crafty.randRange(1, 4);
Crafty.e("2D, canvas, grass" + grassType)
.attr({x: i * 16, y: j * 16});
// 1/50 chance of drawing a flower and only within the bushes
if (i > 0 && i < 24 && j > 0 && j < 19 && Crafty.randRange(0, 50) > 49) {
Crafty.e("2D, DOM, flower, animate")
.attr({x: i * 16, y: j * 16})
.animate("wind", 0, 1, 3)
.bind("enterframe", function() {
if (!this.isPlaying())
this.animate("wind", 80);
});
}
}
}
// Create the bushes along the x-axis which will form the boundaries
for (var i = 0; i < 25; i++) {
Crafty.e("2D, canvas, wall_top, bush"+Crafty.randRange(1,2))
.attr({x: i * 16, y: 0, z: 2});
Crafty.e("2D, canvas, wall_bottom, bush"+Crafty.randRange(1,2))
.attr({x: i * 16, y: 304, z: 2});
}
// Create the bushes along the y-axis
// We need to start one more and one less to not overlap the previous bushes
for (var i = 1; i < 19; i++) {
Crafty.e("2D, canvas, wall_left, bush" + Crafty.randRange(1,2))
.attr({x: 0, y: i * 16, z: 2});
Crafty.e("2D, canvas, wall_right, bush" + Crafty.randRange(1,2))
.attr({x: 384, y: i * 16, z: 2});
}
}
// The loading screen that will display while our assets load
Crafty.scene("loading", function() {
// Load takes an array of assets and a callback when complete
Crafty.load(["sprite.png"], function() {
Crafty.scene("main"); //when everything is loaded, run the main scene
});
// Black background with some loading text
Crafty.background("#000");
Crafty.e("2D, DOM, text").attr({w: 100, h: 20, x: 150, y: 120})
.text("Loading")
.css({"text-align": "center"});
});
// Automatically play the loading scene
Crafty.scene("loading");
};
generateWorld()
is a function that will create entities to fill up the stage. This is the first time we have created an entity so I will go over that first. The function to create an entity is simply Crafty.e()
. That’s it. You can also pass a string of components to add which will just call the .addComponent()
method. Have a look at the following lines of code:
grassType = Crafty.randRange(1, 4);
Crafty.e("2D, canvas, grass" + grassType)
.attr({x: i * 16, y: j * 16});
When we spliced the sprite map, we had four types of grass components/labels: grass1
, grass2
, grass3
and grass4
. Using a little helper method, Crafty.randRange()
, we generate a random number between 1 and 4 to decide which grass tile to use and apply it to the entity.
You will notice we are also adding some odd-looking components: 2D and canvas. 2D is a very important component which gives the entity and x and y position, width and height (called .w and .h), rotation, alpha and some basic rectangle calculations. The other component, canvas, tells Crafty how to draw the entity and with this component obviously on the canvas element. You can just as easy use the DOM component and it will instead draw it as a <div>
.
Tip: DOM is usually always faster than canvas and if you notice sluggish performance in a canvas entity, try using DOM. It will look and act no different.
The rest of the method generates a boundary around the stage so the player can’t walk off. This uses the bush sprite. These boundary entities have a component, either wall_left
, wall_right
, wall_up
or wall_down
. The only purpose they serve is as a label — there is no inherited functionality.
- Sent (0)
- New
Generate your business videos by AI with voice or just text
chatGPTaz.com
Talk to ChatGPT by your mother language
AppAIVideo
Your first FREE AI Video App
Deepfake Video
Deepfake AI Video Maker
Deepfake
Deepfake AI Video Maker
AI Deep Fake
Deepfake AI Video Maker
AIvidio
AI Video Mobile Solutions
AIvideos
AI Video Platform & Solutions
AIvedio
AI Video App Maker
Artificial General Intelligence
Ai and higher level Artificial General Intelligence (AGI)
Artificial General Intelligence
Ai and higher level Artificial General Intelligence (AGI)
Faceswap AI Online
Swap Faces Video, Photo & GIFs Instantly with Powerful AI Tools - Faceswap AI Online FREE
Faceswap AI Online
Swap Faces Video, Photo & GIFs Instantly with Powerful AI Tools - Faceswap AI Online FREE
Faceswap AI Online
Swap Faces Video, Photo & GIFs Instantly with Powerful AI Tools - Faceswap AI Online FREE
Powerful AI Presentation PPT Maker for FREE
Build an impressive presentation with our free online AI presentation app
Your next top AI Assistant
Claude AI, developed by Anthropic
Your next top AI Assistant
Claude AI, developed by Anthropic
Temu Free $500 for New Users
Claim Free Temu $500 Credit via Affiliate & Influencer Program
Free TikTok Ads Credit
Master TikTok Ads for Your Business Marketing
Dall-E-OpenAI.com
Generate creative images automatically with AI
chatGPT4.win
Talk to ChatGPT by your mother language
First AI Product from Elon Musk - Grok/UN.com
Speak to Grok AI Chatbot with Your Language
Tooly.win
Open tool hub for free to use by any one for every one with hundreds of tools
GateIO.gomymobi.com
Free Airdrops to Claim, Share Up to $150,000 per Project
iPhoneKer.com
Save up to 630$ when buy new iPhone 16
Buy Tesla Optimus Robot
Order Your Tesla Bot: Optimus Gen 2 Robot Today for less than $20k