## Daily graphic 2

Tue 17 March 2015

Todays daily graphic I'm getting familiar with grids (in shoebot), Vector maths from the planar library .. this started from the grid example from shoebot / nodebox.

Shoebot Code Below the fold

``` {: .brush:python} """ Grid of arrows that point towards the mouse pointer.

Uses planar library for Vec2, angles. """

# shoebot :)

import random

from planar import Vec2, Affine

size(625, 625)

# saturation and brightness.

colormode(HSB)

def draw(): random.seed(0) # Set some initial values. You can and should play around with these. h = 0 s = 0.5 b = 0.9 a = .5

``````# Size is the size of one grid square.
size = 50

# Create a grid with 10 rows and 10 columns. The width of the columns
# and the height of the rows is defined in the 'size' variable.
for x, y in grid(WIDTH / size, HEIGHT / size, size, size):
reset()
# Using the translate command, we can give the grid some margin.
translate(size,size)

# Increase the hue while choosing a random saturation.
# Try experimenting here, like decreasing the brightness while
# changing the alpha value etc.
h+=.01
s=random.random()
pos=Vec2(x-MOUSEX, y-(MOUSEY - size))

# Set this to be the current fill color.
fill(h, s, b, a)

# Draw a angle that is one and a half times larger than the
rotate(180-pos.angle)
arrow(x, y, size*1.5)
``````

```