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Other unset positions in the matrix would just return undefined or null. html in the code repository, shows how to implement this idea, with the result shown in Figure 1-11. Figure 1-11. Screenshot of Example 1-8; red squares indicate positions that have been clicked by the player Choosing a Rendering Method for Our Graphics | 37 Example 1-7. height) >= 0) ? width) >= 0) ? width) ? height) ? height); } } setTimeout(draw, 1); Choosing a Rendering Method for Our Graphics | 39 } }
Use the UP, DOWN, LEFT and RIGHT keys to scroll
Scroll X: 0
Scroll Y: 0 So far, all the optimizations that we have made allowed us to increase the performance of our game dramatically, but there is one more thing that we need to take care of before we go on.

Other unset positions in the matrix would just return undefined or null. html in the code repository, shows how to implement this idea, with the result shown in Figure 1-11. Figure 1-11. Screenshot of Example 1-8; red squares indicate positions that have been clicked by the player Choosing a Rendering Method for Our Graphics | 37 Example 1-7. height) >= 0) ? width) >= 0) ? width) ? height) ? height); } } setTimeout(draw, 1); Choosing a Rendering Method for Our Graphics | 39 } }
Use the UP, DOWN, LEFT and RIGHT keys to scroll
Scroll X: 0
Scroll Y: 0 So far, all the optimizations that we have made allowed us to increase the performance of our game dramatically, but there is one more thing that we need to take care of before we go on.

We can resort to working with 500×500 or 1,000×1,000 fragments and then, as we are approaching the “beginning” or the “end” of the fragment, we can use a memory paging routine to load/save the fragments, either in the computer hard disk drive—in our case, the WebStorage API—or online in a database. For the sake of simplicity, for our game we will be working with a 250×250 grid (62,500 tiles) and will leave the implementation of a memory paging function as an exercise for the reader. For the moment, we’re going to focus on displaying our grid using squares, and later on, we’ll switch to an isometric view.