ROSECODE 560
Grid painting
The original interaction is no longer available. Any surviving program is preserved as source code.
Let there be a grid with M rows and N columns. The cells are numbered starting from 0 (topmost left) to MxN-1 (bottommost right) and some cells are painted to yellow randomly using the following code:
uint8 grid[NROWS*NCOLS] = {0};
void FillGrid(const int NROWS, const int NCOLS, const int NCELLS)
{
int NCellsPainted = (NCELLS+1)>>1;
uint painted = 0;
uint32 seed = 10001;
while (painted < NCellsPainted)
{
seed = seed * 10001 + 1001;
uint rowcol = seed % NCELLS;
if (grid[rowcol] == 0)
{
grid[rowcol] = 1; // [row,col] painted
++painted;
}
}
}let createMatrix = (m, n) => {
let [row, column] = [[], []],
rowColumn = m * n
for (let i = 0; i < rowColumn; i++) {
column.push(i)
if ((i+1) % n === 0) {
row.push(column)
column = []
}
}
return row
}
let setColorForEachElement = (matrix, nums) => {
let row = matrix.map(row => {
let column = row.map((column, key) => {
return { number: column, color: nums.indexOf(column) != -1?'yellow':'white' }
})
return column
})
return row
}
let generateNumbers = (m, n, s) =>
{
let grid = Array(m*n).fill(0);
let nums = [];
let NCells = s;
let NCellsPainted = (s+1)>>1;
let painted = 0;
let seed = 10001;
while (painted < NCellsPainted)
{
seed = seed * 10001 + 1001;
seed %= 4294967296;
let rowcol = seed % NCells;
if (grid[rowcol] == 0)
{
grid[rowcol] = 1;
nums.push(rowcol);
++painted;
}
}
return nums;
}
const matrix = createMatrix(6, 7)
const colorApi = setColorForEachElement(matrix, generateNumbers(6,7,40))
let table ='<font face="Courier New"><table>'
colorApi.forEach(row => {
table+= '<tr>'
row.forEach(column => table += `<td style='background: ${column.color};'>${column.number}<td>` )
table+='</tr>'
})
table+= '</table></font>'
let outputDiv = document.getElementById("ExampleGrid");
outputDiv.innerHTML = table;