Thursday, July 21, 2011

DDTe3 Hour 7 - Making a Slider

As mentioned last post, to make it easier to remember to post, I am going to post the blog at the same time I update Blazing Games. This week I am continuing my series of articles on the creation of Dozen Days of Tiles episode 3 which is an as many games as I can develop in under 24 hours of development time challenge. So far the picture puzzle game has been created so development on a sliding puzzle has just started.

After finishing the first game, most of the work is now present that additional games should be able to be created quickly. The second game that I have in mind is a sliding puzzle. To get the functionality needed to create the game, a slider has to be moved around the game board. This can be handled by swapping pieces so no additional features need to be added to the base puzzle model. However, there needs to be a visible slider on the screen so some extensions will need to be added to the base model view class.

While thinking about how to actually add the tile, my first thought was to simply make the highlight as the tile. As clicking on a tile will cause the slider to move, no highlight is needed for this game so all the work is already done. The only downside to this approach is that it would require a more-solid highlight but since I want to add the ability to change the border and highlight colors anyway, the slider would be essentially free. Another route that I could have taken would be to simply add an ability to grab a tiles display position so I could simply add a sprite over-top of the  board.

To allow the tile border and highlight colors to be changed, a setColors  function was added to the TileBorder class. The class uses both colors and alpha values as I had decided when creating the HighlightBlock class to keep the alpha value separate from the color. My thoughts at the time were that it allows for alpha effects to be implemented much easier and has the side benifit that normal color labels (such as red or blue) can then be used rather than requiring the use of the rgba() function to specify colors.

Finally, in the BaseModelView class, a set colors class was added which simply calls the setColor class for every border in the view.

PuzzleGallery.BasePuzzleView.prototype.setColors = function(col, ccol, ecol, ba, ha)
   var w = this.puzzle.puzzleWidth;
   var h = this.puzzle.puzzleHeight;
   var n = w * h;

   for (var indx = 0; indx < n; ++indx) {
       this.tileBorders[indx].setColors(col, ccol, ecol, ba, ha);

We now have everything needed to create a slider so the next step is to create a sliding puzzle game.

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