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Commit b9565177 authored by Glen Pike's avatar Glen Pike
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Tabbing code blocks in spider doc and spider image.

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doc/projects/04-spider.md
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![](https://github.com/nebogeo/dbscode/raw/master/doc/images/dbscode.png)
# A Minecraft spider generator
![Spider](https://github.com/glenpike/dbscode/raw/master/doc/images/spider.jpg "A spider")
![Spider](https://github.com/nebogeo/dbscode/raw/master/doc/images/spider.jpg "A spider")
Before you start:
......@@ -26,7 +28,7 @@ of environment.
* Lets start with the body. Build a sphere by adding this to the end of your script:
sphere(DIAMOND_BLOCK, point(0, 10, 0), 8)
sphere(DIAMOND_BLOCK, point(0, 10, 0), 8)
* **Test** Press F5 and navigate to the centre of the world (using the
coordinates at the top left of the Minecraft window). You should see a
......@@ -36,7 +38,7 @@ remembering this maybe helpful later on.
* Not very exciting yet, lets add a head, we make it a bit smaller than the body:
sphere(DIAMOND_BLOCK, point(0, 10, 8 + 6), 6)
sphere(DIAMOND_BLOCK, point(0, 10, 8 + 6), 6)
* **Test** Press F5 and make sure there are 2 spheres drawn. We've positioned
the smaller one in front of the large sphere by moving it's centre by the radius
......@@ -49,12 +51,12 @@ less than the radius. See if you can fix it. The correct code is shown further
but let's give the spider some knees too. We will draw a horizontal line out from the body
at point(8, 10, 0), this is 8 blocks long and one thick, point(8, 1, 1)
box(OBSIDIAN, point(8, 10, 0), point(8, 1, 1))
box(OBSIDIAN, point(8, 10, 0), point(8, 1, 1))
* Then we draw a vertical line down. We position this underneath the last horizontal block
at point(15, 9, 0) and draw 7 blocks down using point(1, -7, 1)
box(OBSIDIAN, point(15, 9, 0), point(1, -7, 1))
box(OBSIDIAN, point(15, 9, 0), point(1, -7, 1))
## Step 3 Make a function for drawing legs
......@@ -70,22 +72,22 @@ with "box" that you've just written so it looks like this
- the spaces at the start of the lines are important - there are 4 of them,
or just press the "tab" key once:
def leg():
box(OBSIDIAN, point(8, 10, 0), point(8, 1, 1))
box(OBSIDIAN, point(15, 9, 0), point(1, -7, 1))
def leg():
box(OBSIDIAN, point(8, 10, 0), point(8, 1, 1))
box(OBSIDIAN, point(15, 9, 0), point(1, -7, 1))
Now we can "call" this function by simply adding this to the bottom of your
program. Your code should now look something like this:
sphere(DIAMOND_BLOCK, point(0, 10, 0), 8)
sphere(DIAMOND_BLOCK, point(0, 10, 7 + 6), 6)
def leg():
box(OBSIDIAN, point(8, 10, 0), point(8, 1, 1))
box(OBSIDIAN, point(15, 9, 0), point(1, -7, 1))
sphere(DIAMOND_BLOCK, point(0, 10, 0), 8)
sphere(DIAMOND_BLOCK, point(0, 10, 7 + 6), 6)
def leg():
box(OBSIDIAN, point(8, 10, 0), point(8, 1, 1))
box(OBSIDIAN, point(15, 9, 0), point(1, -7, 1))
leg()
leg()
* Press F5 - your spider should appear with one leg, now we need to make
it draw the other 7.
......@@ -95,18 +97,18 @@ to pass information into a function by adding them to the brackets at
the top and refering to them inside. Change your existing function and
add "pos" to all of the positions of the shapes:
def leg(pos):
box(OBSIDIAN, pos, point(8, 1, 1))
box(OBSIDIAN, pos+point(7, -1, 0), point(1, -7, 1))
def leg(pos):
box(OBSIDIAN, pos, point(8, 1, 1))
box(OBSIDIAN, pos+point(7, -1, 0), point(1, -7, 1))
* We can now pass in the position when we call the function to draw a leg
in any position. This will draw 4 legs on one side of the body, spaced apart
by a block. Change the "leg()" line to the following:
leg(point(8, 10, 1))
leg(point(8, 10, 3))
leg(point(8, 10, 5))
leg(point(8, 10, 7))
leg(point(8, 10, 1))
leg(point(8, 10, 3))
leg(point(8, 10, 5))
leg(point(8, 10, 7))
* Press F5 - your spider should appear with 4 legs on one side, but they may
be slightly out of position. See if you can fix this. (Remember the middle
......@@ -122,8 +124,8 @@ leg.
* To do this we need a "for" loop. Remove the 4 leg() "calls" and replace with this:
for i in range(0, 4):
leg(point(8, 10, i * 2))
for i in range(0, 4):
leg(point(8, 10, i * 2))
* This will repeat the `leg` line 4 times (make sure you add 4 spaces
before), each time with i being a number described by the `range`
......@@ -135,8 +137,8 @@ blocks)
positions the legs with negative and positive z positions, change the above
for loop to do this:
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1))
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1))
* Press F5 to test again - your legs should now be positioned either side
of the vertical centre line of the sphere.
......@@ -151,9 +153,9 @@ of the parameters for our point to a negative value. We can be lazy and use
the same loop again, bonus! Copy the code which calls the leg function and
repeat it underneath the line you copied:
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1))
leg(point(8, 10, i * 2 + 1))
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1))
leg(point(8, 10, i * 2 + 1))
* Right, now change one of the three parameters to a negative value. See if
you can work out the correct one to do before you press F5.
......@@ -173,17 +175,17 @@ the other way.
to make the legs draw correctly. The code below shows the function and the
for loop which calls it - replace your leg drawing code with this:
def leg(pos, flip):
if(flip):
box(GOLD_BLOCK, pos+point(-7, 0, 0), point(8, 1, 1))
box(OBSIDIAN, pos+point(-7, -1, 0), point(1, -7, 1))
else:
box(GOLD_BLOCK, pos, point(8, 1, 1))
box(OBSIDIAN, pos+point(7, -1, 0), point(1, -7, 1))
def leg(pos, flip):
if(flip):
box(GOLD_BLOCK, pos+point(-7, 0, 0), point(8, 1, 1))
box(OBSIDIAN, pos+point(-7, -1, 0), point(1, -7, 1))
else:
box(GOLD_BLOCK, pos, point(8, 1, 1))
box(OBSIDIAN, pos+point(7, -1, 0), point(1, -7, 1))
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1), False)
leg(point(-8, 10, i * 2 + 1), True)
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1), False)
leg(point(-8, 10, i * 2 + 1), True)
## Step 7 Eyes.
......@@ -206,12 +208,12 @@ quite simply.
* Add the following code to the bottom of your file:
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(GOLD_BLOCK, point(x, y + 10, 20), point(1, 1, 1))
draw = ~draw
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(GOLD_BLOCK, point(x, y + 10, 20), point(1, 1, 1))
draw = ~draw
* Press F5 to test and you should see the eyes appear in a check pattern
in front of the spiders head. We have a gap between the head and eyes because
......@@ -220,15 +222,15 @@ we chose "20" for the z- position just to get it working.
* Right, lets put this in a function so we can tell it where to put the
eyes easily. Remove the code you just wrote and replace it with the following:
def eyes(pos):
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(GOLD_BLOCK, point(pos.x + x, pos.y + y, pos.z), point(1, 1, 1))
draw = ~draw
def eyes(pos):
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(GOLD_BLOCK, point(pos.x + x, pos.y + y, pos.z), point(1, 1, 1))
draw = ~draw
eyes(point(0, 10, 19))
eyes(point(0, 10, 19))
## Step 8 Tidy up.
......@@ -244,38 +246,38 @@ the map.
Try to move all your "def" functions above your function calls so your code looks
like this:
from dbscode_minecraft import *
from dbscode_minecraft import *
bulldoze()
def leg(pos, flip):
if(flip):
box(GOLD_BLOCK, pos+point(-7, 0, 0), point(8, 1, 1))
box(OBSIDIAN, pos+point(-7, -1, 0), point(1, -7, 1))
else:
box(GOLD_BLOCK, pos, point(8, 1, 1))
box(OBSIDIAN, pos+point(7, -1, 0), point(1, -7, 1))
def eyes(pos):
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(GOLD_BLOCK, point(pos.x + x, pos.y + y, pos.z), point(1, 1, 1))
draw = ~draw
sphere(DIAMOND_BLOCK, point(0, 10, 0), 8)
sphere(DIAMOND_BLOCK, point(0, 10, 7 + 6), 6)
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1), False)
leg(point(-8, 10, i * 2 + 1), True)
bulldoze()
def leg(pos, flip):
if(flip):
box(GOLD_BLOCK, pos+point(-7, 0, 0), point(8, 1, 1))
box(OBSIDIAN, pos+point(-7, -1, 0), point(1, -7, 1))
else:
box(GOLD_BLOCK, pos, point(8, 1, 1))
box(OBSIDIAN, pos+point(7, -1, 0), point(1, -7, 1))
def eyes(pos):
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(GOLD_BLOCK, point(pos.x + x, pos.y + y, pos.z), point(1, 1, 1))
draw = ~draw
sphere(DIAMOND_BLOCK, point(0, 10, 0), 8)
sphere(DIAMOND_BLOCK, point(0, 10, 7 + 6), 6)
for i in range(-2, 2):
leg(point(8, 10, i * 2 + 1), False)
leg(point(-8, 10, i * 2 + 1), True)
eyes(point(0, 10, 19))
eyes(point(0, 10, 19))
* Now create a spider function which draws the 2 spheres, the legs and eyes.
This needs to take 3 parameters, the colours and the position.
def spider(body_colour, leg_colour, pos):
def spider(body_colour, leg_colour, pos):
* Which code goes inside the function?
......@@ -293,36 +295,36 @@ tell it the colour you want?
* Here is the whole code that should do all this:
from dbscode_minecraft import *
bulldoze()
def leg(pos, flip, colour):
if(flip):
box(colour, pos+point(-7, 0, 0), point(8, 1, 1))
box(colour, pos+point(-7, -1, 0), point(1, -7, 1))
else:
box(colour, pos, point(8, 1, 1))
box(colour, pos+point(7, -1, 0), point(1, -7, 1))
def eyes(pos, colour):
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(colour, point(pos.x + x, pos.y + y, pos.z), point(1, 1, 1))
draw = ~draw
def spider(body_colour, leg_colour, pos):
sphere(body_colour, pos, 8)
sphere(body_colour, pos+point(0, 0, 13), 6)
for i in range(-2, 2):
leg(pos+point(8, 0, i * 2 + 1), False, leg_colour)
leg(pos+point(-8, 0, i * 2 + 1), True, leg_colour)
eyes(pos+point(0, 0, 19), leg_colour)
spider(OBSIDIAN, GOLD_BLOCK, point(0, 10, 0))
from dbscode_minecraft import *
bulldoze()
def leg(pos, flip, colour):
if(flip):
box(colour, pos+point(-7, 0, 0), point(8, 1, 1))
box(colour, pos+point(-7, -1, 0), point(1, -7, 1))
else:
box(colour, pos, point(8, 1, 1))
box(colour, pos+point(7, -1, 0), point(1, -7, 1))
def eyes(pos, colour):
draw = True
for x in range(-2, 3):
for y in range(-1, 2):
if True == draw:
box(colour, point(pos.x + x, pos.y + y, pos.z), point(1, 1, 1))
draw = ~draw
def spider(body_colour, leg_colour, pos):
sphere(body_colour, pos, 8)
sphere(body_colour, pos+point(0, 0, 13), 6)
for i in range(-2, 2):
leg(pos+point(8, 0, i * 2 + 1), False, leg_colour)
leg(pos+point(-8, 0, i * 2 + 1), True, leg_colour)
eyes(pos+point(0, 0, 19), leg_colour)
spider(OBSIDIAN, GOLD_BLOCK, point(0, 10, 0))
## Step 9 Spidercraft
......
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