{
"metadata": {
"name": ""
},
"nbformat": 3,
"nbformat_minor": 0,
"worksheets": [
{
"cells": [
{
"cell_type": "code",
"collapsed": false,
"input": [
"from ipythonblocks import BlockGrid, colors"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 1
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# start with the grid at http://ipythonblocks.org/zcezcM\n",
"grid = BlockGrid.from_web('zcezcM')"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 2
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"grid"
],
"language": "python",
"metadata": {},
"outputs": [
{
"html": [
""
],
"metadata": {},
"output_type": "pyout",
"prompt_number": 3,
"text": [
""
]
}
],
"prompt_number": 3
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# turn off the grid lines\n",
"grid.lines_on = False\n",
"grid"
],
"language": "python",
"metadata": {},
"outputs": [
{
"html": [
""
],
"metadata": {},
"output_type": "pyout",
"prompt_number": 4,
"text": [
""
]
}
],
"prompt_number": 4
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"# going to draw a white spiral through the grid starting with the\n",
"# [0, 1] block and proceeding counter-clockwise.\n",
"# can think of this as repeatedly drawing some almost-closed\n",
"# boxes and making the box smaller each time.\n",
"def draw_spiral_box(row, col):\n",
" # starting point, since it's skipped\n",
" grid[row, col] = colors['White']\n",
" \n",
" # calculate the bounds of the spiral box\n",
" left_col = col\n",
" right_col = grid.width - col - 1\n",
" top_row = row + 1\n",
" bot_row = grid.height - row - 2\n",
" \n",
" # make sure it hasn't gotten so small it's time to stop\n",
" if right_col - left_col < 1 or bot_row - top_row < 2:\n",
" return None\n",
" \n",
" # left line\n",
" grid[top_row:bot_row, col] = colors['White']\n",
" # bottom line\n",
" grid[bot_row, left_col:(right_col + 1)] = colors['White']\n",
" # right line\n",
" grid[top_row:bot_row, right_col] = colors['White']\n",
" # top line--going to be two blocks shorter than the bottom one\n",
" grid[top_row, (left_col + 2):right_col] = colors['White']\n",
" \n",
" # start over from a new point\n",
" draw_spiral_box(row + 2, col + 2)\n",
" \n",
"\n",
"row = 0\n",
"col = 1\n",
"\n",
"draw_spiral_box(row, col)"
],
"language": "python",
"metadata": {},
"outputs": [],
"prompt_number": 5
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"grid"
],
"language": "python",
"metadata": {},
"outputs": [
{
"html": [
""
],
"metadata": {},
"output_type": "pyout",
"prompt_number": 6,
"text": [
""
]
}
],
"prompt_number": 6
},
{
"cell_type": "code",
"collapsed": false,
"input": [
"grid.post_to_web('1:8')"
],
"language": "python",
"metadata": {},
"outputs": [
{
"metadata": {},
"output_type": "pyout",
"prompt_number": 7,
"text": [
"u'http://ipythonblocks.org/RTRATA'"
]
}
],
"prompt_number": 7
},
{
"cell_type": "code",
"collapsed": false,
"input": [],
"language": "python",
"metadata": {},
"outputs": []
}
],
"metadata": {}
}
]
}