shadow-fight

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A fighting game inspired by Tekken and Street Fighter, exploring the strengths and limitations of HTML5 Canvas.

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// repository documentation

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# Shadow fight
## Background and Overview
Shadow fight is an action game where the player is matched up against an AI and must defeat them by whittling down their health. Inspired by numerous fighting games, the fundamental game logic will be extremely similar to the more popular and well known games.

Users will take control of an avatar with basic movement, jump and crouch, and have the ability to attack the enemy. The model hitbox will change depending on the avatar position, as well as if they are crouching, and whenever an attack lands (simple collision won't count), damage is done. The AI will perform random movement/attacks, but may implement algorithmic combos.

## Features
Given the time constraint, only the basic features have been implemented. A re/starting screen has been implemented with controls to un/mute the background soundtrack, and a modal help display to show controls and credits. Upon clicking, the user starts the game with two avatars facing off against each other with a time limit of 120 seconds to beat each other, otherwise the game will time out and result in a draw.

![start](https://github.com/dowinterfor6/shadow-fight/blob/master/docs/images/starting-page.png)

The actual gameplay is limited to punching only, and both sprites are sourced from Deviantart as Ryu. Controls are for 2 players, locally, on a full sized keyboard with a numpad. Jumping, idle, walking, and attacking have unique animations.

![game](https://github.com/dowinterfor6/shadow-fight/blob/master/docs/gifs/gameplay.gif)

## Timer Circle (Moving "slice")
```Javascript
// frontend/level.js
drawTimerDisplay() {
   this.ctx.beginPath();
   this.ctx.fillStyle = COLOR_PALETTE.QUATERNARY;
   this.ctx.arc(
     this.dimensions.width / 2,
     LEVEL_CONSTANTS.TIMER_TEXT_HEIGHT - 5,
     LEVEL_CONSTANTS.TIMER_RADIUS,
     - 0.5 * Math.PI,
     (LEVEL_CONSTANTS.MAX_TIME - this.time)
     * 2 * Math.PI / LEVEL_CONSTANTS.MAX_TIME
     - 0.5 * Math.PI
   );
   this.ctx.lineTo(this.dimensions.width / 2,
     LEVEL_CONSTANTS.TIMER_TEXT_HEIGHT - 5
   );
   this.ctx.fill();
 }
```
A deceptively simple feature, I wanted to manually implement a timer circle that represented the remaining time via proportion of a full circle (think, slices of pizza being taken away every few seconds). Without referring to libraries, the current design utilized some math to figure out where the lines should be drawn in order for the display to function correctly. Initially, the interpretation of the arc was understood differently, creating a segment of the circle instead of an actual arc, however things became much simpler when the ctx.arc was being used properly. Alongside the health bars with angled ends, these two methods proved to be the most challenging, not because of the sheer difficulty of the mathematics, nor the complexity of the coding language, but rather the implementation of both.

## Avatar state
```Javascript
// frontend/avatar.js
this.state = {
  health: AVATAR_CONSTANTS.MAX_HEALTH,
  basicAttacking: false,
  damageDone: false,
  basicAttackHitbox: {
    w: AVATAR_CONSTANTS.AVATAR_DIMENSIONS.width / 2 + 40,
    h: 10
  },
  basicAttackDamage: 10,
  facing: playerNum === 1 ? 1 : -1,
  basicAttackKeycode: playerNum === 1 ? 74 : 97,
  movement: 'idle'
}
```
Taking inspiration from React/Redux, implementing a POJO representing the general state of an avatar instance proved to be helpful as there were too many separate instance variables to keep track of. This is set as an initialization, similar to the initial state being set in React components. Keypresses are recorded and placed in another POJO to be carried out and displayed as soon as possible, as well as to prevent overlap in multiple keypresses of the same key. Another important feature is the "facing" variable, which is set based on which player the avatar instance represents, e.g. Player 1 always faces right, and starts on the left, while Player 2 always faces left, and starts on the right.

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