obelisk.js/src/primitives/Pyramid.js

JavaScript Library for Building Pixel Isometric Element with HTML5 Canvas

/*jslint node: true*/

'use strict';

var PyramidDimension = require('../dimensions/PyramidDimension');
var PyramidColor = require('../colors/PyramidColor');
var Matrix = require('../geom/Matrix');
var BitmapData = require('../display/BitmapData');
var AbstractPrimitive = require('./AbstractPrimitive');

var Pyramid, p;
Pyramid = function (dimension, color, border, useDefaultCanvas) {
    this.initialize(dimension, color, border, useDefaultCanvas);
};
p = Pyramid.prototype = new AbstractPrimitive();

// private properties
p.hSize = null;
p.hOffset = null;

// constructor
p.initialize = function (dimension, color, border, useDefaultCanvas) {
    this.initRender(dimension, color, border, useDefaultCanvas);
    this.initRectangle();
    this.initBitmapData();
    this.build();
    this.renderBitmapDataForCanvas();

    return this;
};

// private method
p.initRender = function (dimension, color, border, useDefaultCanvas) {
    this.useDefaultCanvas = useDefaultCanvas || false;
    this.border = border || border === undefined;
    this.dimension = dimension === undefined ? new PyramidDimension() : dimension;
    this.color = color === undefined ? new PyramidColor() : color;

    this.hSize = this.dimension.tall ? this.dimension.xAxis * 2 : this.dimension.xAxis;
    this.hOffset = this.dimension.tall ? -3 : -2;
};

p.initRectangle = function () {
    this.w = this.dimension.xAxis + this.dimension.yAxis;
    this.h = this.hSize + this.dimension.xAxis / 2;

    // 22.6 degrees implementation
    this.w -= 2;
    this.h += this.hOffset;

    // the matrix offset between the bitmap and the 3d pixel coordinate ZERO point
    this.matrix = new Matrix();
    this.matrix.tx = -this.dimension.xAxis + 2;
    this.matrix.ty = -this.hSize / 2 + 2 - (this.dimension.tall ? this.dimension.xAxis / 2 : 1);
};

p.initBitmapData = function () {
    this.bitmapData = new BitmapData(this.w, this.h, this.useDefaultCanvas);
};
p.renderBitmapDataForCanvas = function () {
    this.bitmapData.context.putImageData(this.bitmapData.imageData, 0, 0);
    this.canvas = this.bitmapData.canvas;
};

p.build = function () {
    var colorBorderLeft, colorBorderRight, colorBorderHighlight,
        i, j, k, l1, m1, l2, m2;

    colorBorderLeft = this.border ? this.color.border : this.color.left;
    colorBorderRight = this.border ? this.color.border : this.color.right;

    colorBorderHighlight = this.border ? this.color.borderHighlight : colorBorderLeft;

    //z axis || hightlight
    for (k = 0; k < this.hSize + this.dimension.xAxis / 2 - 4; k += 1) {
        this.bitmapData.setPixel(this.dimension.xAxis - 2, k + 3 + this.hOffset, colorBorderHighlight);
    }

    //x axis
    for (i = 0; i < this.dimension.xAxis; i += 1) {
        this.bitmapData.setPixel(i, this.hSize + Math.floor(i / 2) + this.hOffset, colorBorderLeft);
    }

    //y axis
    for (j = 0; j < this.dimension.xAxis; j += 1) {
        this.bitmapData.setPixel(j + this.dimension.xAxis - 2, this.hSize + this.dimension.xAxis / 2 - Math.floor(j / 2) - 1 + this.hOffset, colorBorderRight);
    }

    if (!this.dimension.tall) {
        //left edge
        for (l1 = 0; l1 < this.hSize; l1 += 1) {
            this.bitmapData.setPixel(l1, this.hSize - l1 + this.hOffset, colorBorderLeft);
        }

        //right edge
        for (m1 = 0; m1 < this.hSize; m1 += 1) {
            this.bitmapData.setPixel(m1 + this.hSize - 2, m1 + 1 + this.hOffset, colorBorderRight);
        }
    } else {
        //left edge
        for (l2 = 0; l2 < this.hSize - 2; l2 += 1) {
            this.bitmapData.setPixel(Math.floor(l2 / 2), this.hSize - l2 + this.hOffset, colorBorderLeft);
        }

        //right edge
        for (m2 = 2; m2 < this.hSize; m2 += 1) {
            this.bitmapData.setPixel(Math.floor(m2 / 2) + this.dimension.xAxis - 2, m2 + 1 + this.hOffset, colorBorderRight);
        }
    }

    if (!this.border) {
        this.bitmapData.setPixel(this.dimension.xAxis - 2, this.hSize + this.dimension.xAxis / 2 - 1 + this.hOffset, colorBorderLeft);
    }

    //floodfill
    this.bitmapData.floodFill(this.dimension.xAxis - 1, this.hSize + Math.floor((this.dimension.xAxis - 1) / 2) + this.hOffset - 1, this.color.right);
    this.bitmapData.floodFill(this.dimension.xAxis - 3, this.hSize + Math.floor((this.dimension.xAxis - 1) / 2) + this.hOffset - 2, this.color.left);
};

// public methods
p.toString = function () {
    return '[Pyramid]';
};

module.exports = Pyramid;