mohan-cao/touhou

engine for web-based bullet dodging game

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Touhou Docs

engine for web-based bullet dodging game

Run 'python -m SimpleHTTPServer', then go to localhost:8000

To create a new level, make a new folder in the bosses folder. The structure should go:

bosses/name_of_boss
    images/
        boss_image1.png
        boss_image2.png
    boss.js
    images.js

images.js contains the names of all the images in the images folder, so the engine can load them all.

boss.js is where the majority of the code should go: this is where you specify all the bullet patterns, how the boss moves around, and so on.

Bullets

The most important part of the game. In the engine, every bullet has a class. Define a bullet class like so:

function BulletClassName(bullet)
{
    this.update = function()
    {
        engine.setBulletDirection(bullet, bullet.direction + 1);
    }
}

Every frame, the main engine will call the update function in every bullet currently on the screen. Bullets that leave the screen will be deleted automatically.

To create a bullet of a specific class, call the following engine function:

    engine.makeBullet(x, y, direction, speed, bulletclass, texturename);

Bullets have a direction, in degrees (0 to 360). They also have a speed. Each frame, the engine moves every bullet by their direction and speed.

Example of making a bullet:

    engine.makeBullet(50, 50, 90, 5, Generic, "images/player_bullet.png")

Engine

Everything you write in boss.js can call functions from the engine class.

engine.makeNamedSprite(name, texture, x, y)

Creates a sprite with a texture and x,y coordinated.

engine.spriteFromName(name)

Get a previously made sprite from its name.

engine.moveSprite(sprite, x, y)

Move sprite to positions x, y.

engine.rotateSprite(sprite, degrees)

Rotate a sprite, around the center.

engine.changeSpriteTexture(sprite, texturename)

Change a sprite's image to another.

engine.changeSpriteOpacity(sprite, opacity)

Change sprite's transparency, from 0 to 1.

engine.removeSprite(sprite)

Remove a sprite from the game.