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‎MINECRAFT_PROGRAMMING.md

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# Minecraft Programming
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Resources
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=========
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## Resources
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* Introduction to the Minecraft Python API: http://www.stuffaboutcode.com/2013/04/minecraft-pi-edition-api-tutorial.html
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* API reference: http://www.stuffaboutcode.com/p/minecraft-api-reference.html
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## Optional: The Fence
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*Objective:* Use if conditions to detect on what side of a fence one is. Reinforcement of coordinates from Intro.
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File -> New -> Save: simple_fence.py
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* Go to a flat area.
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* Build a small fence (as shown on the screenshot) along the *x* axis, that is *z* should not change along the wall.
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* Step on the fence, and walk along it, to determine its orientation. *y* will not change.
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* Once you know what coordinate you built it along, you're ready to write the code.
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```python
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import mcpi.minecraft as minecraft
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import time
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mc = minecraft.Minecraft.create()
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while True:
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time.sleep(1)
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pos = mc.player.getTilePos()
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if pos.z < z: # what's the fence z coordinate?
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print("North of the fence.")
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elif pos.z > z: # what's the fence z coordinate?
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print("South of the fence.")
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else:
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print("On the fence.")
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```
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:bulb: Do you want to print to the Shell or to Minecraft chat?
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![fence](https://raw.githubusercontent.com/gritcoding/minecraft/master/screenshots/fence.png)
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## Optional: The Cross
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*Objective:* Use embedded if conditions and creative string concatenation
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* Enhance your fence to look like a cross, like in the screenshot
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* Figure out where the midpoint is, that is the *x* and *z* coordinates.
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* You're ready to write the code.
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File -> New -> Save: cross.py
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```python
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import mcpi.minecraft as minecraft
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import time
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mc = minecraft.Minecraft.create()
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while True:
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time.sleep(1)
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pos = mc.player.getTilePos()
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if pos.z operator z: # use the required operator
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north_south = "North"
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if pos.x operator x: # use the required operator
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print(north_south + " West")
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else:
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print(north_south + " East")
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elif pos.z operator z: # use the required operator
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north_south = "South"
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if pos.x operator x: # use the required operator
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print(north_south + " West")
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else:
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print(north_south + " East")
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else:
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print() # where am I now?
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```
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* Explain string concatenation again.
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* Explain greater or equal versus greater.
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![cross](https://raw.githubusercontent.com/gritcoding/minecraft/master/screenshots/cross.png)
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## Anarkali
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Anarkali (Pomegranate Blossom) lived in 17th Century India. She feel in love with the Prince and the King built a wall around her to keep her and the Prince apart.
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Anarkali (Pomegranate Blossom) lived in 17th Century India. She fell in love with the Prince and the King built a wall around her to keep her and the Prince apart.
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*Objective:* Build four walls around your player when she steps onto the trap (and eventually help her escape).
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![Anarkali](screenshots/anarkali.png)
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Before you start, you might want to sketch it out with pencil and paper. What range of coordinates will your walls cover?
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:bulb: Before you start, you might want to sketch it out with pencil and paper. What range of coordinates will your walls cover?
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File -> New -> Save: anarkali.py
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break # end whlile loop (so we don't keep rebuilding the walls)
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```
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:bulb: While you experiment, you may need to keep changing your trap position to build a new structure in a different place.
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Make sure your walls are high enough to Anarkali can't jump out!
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:bulb: There are faster ways to build structures. Rather than looping and setting a single block at a time, we can set a range of blocks together:
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mc.player.setPos(x+10, y+10, z+10) # move player to a new position, and watch her fall to earth
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```
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:trophy: Challenge: What if Anarkali was born in Eygpt not India? Would the king build a tower, or... a Pyramid!
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The fence, if conditions
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------------------------
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*Objective:* introduce if conditions by detecting on what side of a fence one is
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* Go to a flat area
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* Build a small fence as shown on the screenshot
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* Step on the fence, and walk along it, to determine its orientation. It will be either *x* or *z*.
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* Once you know what coordinate you built it along, you're ready to write the code
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```python
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import mcpi.minecraft as minecraft
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import time
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mc = minecraft.Minecraft.create()
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while True:
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time.sleep(1)
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pos = mc.player.getTilePos()
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if pos.x > -119:
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print("north of the fence")
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elif pos.x < -119:
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print("south of the fence")
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else:
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print("on the fence")
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```
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![fence](https://raw.githubusercontent.com/gritcoding/minecraft/master/screenshots/fence.png)
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The cross, two if conditions
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----------------------------
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*Objective:* introduce embedded if conditions and creative string concatenation
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* Enhance your fence to look like a cross, like in the screenshot
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* Figure out where the midpoint is. If previously you built around the *z* coordinate, then this time your other coordinate is *x* and vice versa.
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* You're ready to write the code.
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```python
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import mcpi.minecraft as minecraft
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import time
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mc = minecraft.Minecraft.create()
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while True:
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time.sleep(1)
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pos = mc.player.getTilePos()
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if pos.x > -119:
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north_south = "north"
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if pos.z > 43:
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print(north_south + "/west")
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else:
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print(north_south + "/east")
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elif pos.x < -119:
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north_south = "south"
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if pos.z > 43:
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print(north_south + "/west")
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else:
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print(north_south + "/east")
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```
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* Explain string concatenation again
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* Explain greater or equal versus greater
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![cross](https://raw.githubusercontent.com/gritcoding/minecraft/master/screenshots/cross.png)
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The tower
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*Objective:* introduce programmatic placement of blocks
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You can stand anywhere for this. After running, you should see a huge tower of stone blocks either in front of you or behind you.
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```python
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import mcpi.minecraft as minecraft
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import mcpi.block as block
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import time
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mc = minecraft.Minecraft.create()
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pos = mc.player.getTilePos()
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for a in range(50):
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mc.setBlock(pos.x+3, pos.y+a, pos.z, block.STONE.id)
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```
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![tower](https://raw.githubusercontent.com/gritcoding/minecraft/master/screenshots/tower.png)
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## The Bulldozer
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* Explain the *range(50)*.
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* Explain the arguments we're passing to setBlock, and the coordinates.
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* Ask the student which coordinate should be increasing.
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* Extra credit
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* Build a fence instead of a tower
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The bulldozer
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-------------
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*Objective:* work with more embedded loops and relative coordinates.
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*Objective:* Work with more embedded loops and relative coordinates.
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* This script lets you clear a large area and leave it suitable for building.
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* In minecraft, an empty space is a block of type *AIR*
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```python
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import mcpi.minecraft as minecraft
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import mcpi.block as block
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import time
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mc = minecraft.Minecraft.create()
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player_pos = mc.player.getTilePos()

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