User:Juanmv94/Temp

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T-Rex runner
Also known as: Chrome T-Rex minigame Developers: The Chromium Authors Platforms: HTML5 Released internationally: 2014 This game has unused code. This game has hidden development-related text. This game has unused graphics. This game has unused text. This game has debugging material.

The T-Rex minigame from Google Chrome is one of the most known easter eggs ever. It can be accesed pressing the space bar, or touching the dinosaur on touchscreen devices when the offline error is shown. It can also be accesed at chrome://dino.

Game Over Dino Early Sprite

Dino sprites are coloured dark gray with a thin white border. The sprite when the dino collides with an obstacle is the only dino sprite with this border removed, This allows to see the dino collision without a thin white separation. However, the original unused game over dino sprite, wasn't removed from the sprites file.

The unused sprite:

The used sprite:

Debugging Features

Collision boxes

checkForCollision() can acept the canvas context as an optional third parameter. If done, coloured collision boxes are drawn for the dino and the next obstacle.

Unused debugging routines

        /**
         * Setting individual settings for debugging.
         * @param {string} setting
         * @param {*} value
         */
        updateConfigSetting: function (setting, value) {
            if (setting in this.config && value != undefined) {
                this.config[setting] = value;

                switch (setting) {
                    case 'GRAVITY':
                    case 'MIN_JUMP_HEIGHT':
                    case 'SPEED_DROP_COEFFICIENT':
                        this.tRex.config[setting] = value;
                        break;
                    case 'INITIAL_JUMP_VELOCITY':
                        this.tRex.setJumpVelocity(value);
                        break;
                    case 'SPEED':
                        this.setSpeed(value);
                        break;
                }
            }
        },

Author comments

T-Rex runner is developed in HTML5, making it's source code accesible. This source code is fully commented.

ASCII art collision details

The collision related code have a commented ASCII art to explain how does it work.

    // Make collision box adjustments,
    // Central box is adjusted to the size as one box.
    //      ____        ______        ________
    //    _|   |-|    _|     |-|    _|       |-|
    //   | |<->| |   | |<--->| |   | |<----->| |
    //   | | 1 | |   | |  2  | |   | |   3   | |
    //   |_|___|_|   |_|_____|_|   |_|_______|_|
    //