1     /**
2         A class to represent the level
3         @author <a href="mailto:matthewcasperson@gmail.com">Matthew Casperson</a>
4         @class
5     */
6     function Level()
7     {
8         this.blocks = new Array();
9         this.powerups = new Object;
10        this.blockWidth = 64;
11        this.blockHeight = 48;
12
13        /**
14            Initialises this object
15        */
16        this.startupLevel = function(canvasWidth, canvasHeight)
17        {
18            this.blocks[0] = 3;
19            this.blocks[1] = 2;
20            this.blocks[2] = 1;
21            this.blocks[3] = 1;
22            this.blocks[4] = 1;
23            this.blocks[5] = 1;
24            this.blocks[6] = 2;
25            this.blocks[7] = 3;
26            this.blocks[8] = 2;
27            this.blocks[9] = 1;
28            this.blocks[10] = 2;
29            this.blocks[11] = 3;
30            this.blocks[12] = 4;
31            this.blocks[13] = 5;
32            this.blocks[14] = 4;
33            this.blocks[15] = 3;
34
35            this.powerups['1'] = 'Gem';
36            this.powerups['6'] = 'Gem';
37            this.powerups['10'] = 'Gem';
38            this.powerups['14'] = 'Gem';
39
40            this.addBlocks(canvasWidth, canvasHeight);
41            this.addPowerups(canvasWidth, canvasHeight);
42
43            return this;
44        }
45
46        /**
47            Adds the blocks to the screen by creating VisualGameObjects
48        */
49        this.addBlocks = function(canvasWidth, canvasHeight)
50        {
51            for (var x = 0; x < this.blocks.length; ++x)
52            {
53                for (var y = 0; y < this.blocks[x]; ++y)
54                {
55                    new VisualGameObject().startupVisualGameObject(g_block, x * this.blockWidth, canvasHeight - (y + 1) * this.blockHeight, 4);
56                }
57            }
58        }
59
60        this.addPowerups = function(canvasWidth, canvasHeight)
61        {
62            for (var x = 0; x < this.blocks.length; ++x)
63            {
64                if (this.powerups[x])
65                {
66                    var xPosition = x * this.blockWidth + this.blockWidth / 2;
67                    var yPosition = canvasHeight - this.groundHeight(x);
68
69                    switch(this.powerups[x])
70                     {
71                        case 'Gem':
72                            new Powerup().startupPowerup(10, g_gem, xPosition - g_gem.width / 2, yPosition - g_gem.height, 4, 1, 1);
73                            break;
74                     }
75                }
76            }
77        }
78
79        /**
80            @return     The block under the specified x position
81            @param x    The x position to test
82        */
83        this.currentBlock = function(x)
84        {
85            return parseInt( x / this.blockWidth);
86        }
87
88        /**
89            @return             The hieght of the ground under the specified block
90            @param blockIndex   The block number
91        */
92        this.groundHeight = function(blockIndex)
93        {
94            if (blockIndex < 0 || blockIndex > this.blocks.length) return 0;
95
96            return this.blocks[blockIndex] *  this.blockHeight;
97        }
98    }