new section on skyscrapers

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walterhiggins 2013-04-13 13:22:38 +01:00
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@ -759,14 +759,79 @@ utils.foreach() function...
); );
#### Exercise #### Exercise
Try changing the above function so that different sounds are played instead of a Cat's Meow. Try changing the above function so that different sounds are played
You'll need to lookup the [CraftBukkit API's Sound class][soundapi] to see all of the possible sounds that can be played. instead of a Cat's Meow. You'll need to lookup the [CraftBukkit API's
Sound class][soundapi] to see all of the possible sounds that can be
played.
Loops are a key part of programming in any language. Javascript Loops are a key part of programming in any language. Javascript
provides `for` and `while` statements for looping and many javascript provides `for` and `while` statements for looping and many javascript
libraries also provide their own custom looping functions. You should libraries also provide their own custom looping functions. You should
use what you feel most comfortable with. use what you feel most comfortable with.
#### Putting `for` loops to use - Building a Skyscraper
For loops can be used to build enormous structures. In this next
exercise I'm going to use a for loop to build a skyscraper. This
skyscraper will be made of Glass and Steel (just like most skyscrapers
in real-life). The first thing to do is see what a single floor of
the skyscraper will look like. Place a block (of any type) where you
want to eventually build the skyscraper, then while your cursor is
pointing at the block, type the following into the in-game prompt...
/js var drone = box(blocks.iron,20,1,20).up().box0(blocks.glass_pane,20,3,20).up(3)
... you should a large (20x20) iron floor with 3 block high glass all around.
![skyscraper-floor.png][img_ssf]
... A skyscraper with just a single floor isn't much of a skyscraper
so the next step is to repeat this over and over. This is where `for`
loops come in. Open your favorite text editor and create a new file in
your js-plugins/{your-name} directory called `myskyscraper.js`, then
type the following...
function skyscraper(floors)
{
floors = floors || 10; // default number of floors is 10
this.chkpt('skyscraper'); // saves the drone position so it can return there later
for (var i = 0; i < floors; i++)
{
this.box(blocks.iron,20,1,20).up().box0(blocks.glass_pane,20,3,20).up(3);
}
return this.move('skyscraper'); // return to where we started
};
load("../drone/drone.js");
Drone.extend('skyscraper',skyscraper);
... so this takes a little explaining. First I create a new function
called skyscraper that will take a single parameter `floors` so that
when you eventually call the `skyscraper()` function you can tell it
how many floors you want built. The first statement in the function
`floors = floors || 10;` just sets floors to 10 if no parameter is
supplied. The next statement `this.chkpt('myskyscraper')` just saves
the position of the Drone so it can eventually return to where it
started when finished building (I don't want the drone stranded atop
the skyscraper when it's finished). Then comes the `for` loop. I loop
from 0 to `floors` and each time through the loop I build a single
floor. When the loop is done I return the drone to where it started.
The last 2 lines load the drone module (it must be loaded before I can
add new features to it) and the last line extends the 'Drone' object
so that now it can build skyscrapers among other things. Once you've
typed in the above code and saved the file, type `reload` in your
in-game prompt, then type ...
/js skyscraper(2);
... A two-story skyscraper should appear. If you're feeling
adventurous, try a 10 story skyscraper! Or a 20 story skyscraper!
Minecraft has a height limit (256 blocks from bedrock) beyond which
you can't build. If you try to build higher than this then building
will stop at that height.
![skyscraper][img_ss]
TODO TODO
### Making Decisions ### Making Decisions
TODO TODO
@ -792,6 +857,8 @@ TODO
[img_2boxes]: img/ypgpm_2boxes.png [img_2boxes]: img/ypgpm_2boxes.png
[img_cr]: img/ypgpm_mc_cr.png [img_cr]: img/ypgpm_mc_cr.png
[img_greet]: img/ypgpm_greet.png [img_greet]: img/ypgpm_greet.png
[img_ssf]: img/skyscraper_floor.png
[img_ss]: img/skyscraper.png
## Categories ## Categories
Minecraft, Programming, ScriptCraft Minecraft, Programming, ScriptCraft

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