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Example: [1]
[2] [3] [4] [5]
[6]
Screenshot:
What it does:
It is a popular Game of Life.
Source code:
#include "cpptk.h"
#include <iostream>
using namespace Tk;
using namespace std;
// parameters of the array
int const arrayWidth = 30;
int const arrayHeight = 30;
int squareSize = 10;
// logical array (on/off)
bool cells[arrayWidth][arrayHeight];
// array of canvas elements id
string squares[arrayWidth][arrayHeight];
void setCell(int i, int j, bool state)
{
::cells[i][j] = state;
if (state)
{
".c" <<
itemconfigure(squares[i][j]) -Tk::fill("red");
}
else
{
".c" <<
itemconfigure(squares[i][j]) -Tk::fill("white");
}
}
// clears the whole array
void clear()
{
for (int i = 0; i != arrayWidth; ++i)
{
for (int j = 0;
j != arrayHeight; ++j)
{
setCell(i, j, false);
}
}
}
// changes the state of some cell (in response to mouse click)
void click(int x, int y)
{
// find the logical coordinates
int i = (x - 1) / squareSize;
int j = (y - 1) / squareSize;
// toggle the state
bool newState = !::cells[i][j];
setCell(i, j, newState);
}
// computes the next generation
void nextStep()
{
int neighbours[arrayWidth][arrayHeight];
// initialize the neighbours counters
for (int i = 1; i != arrayWidth - 1; ++i)
{
for (int j = 1;
j != arrayHeight - 1; ++j)
{
neighbours[i][j] = 0;
}
}
// count the neighbours of each cell
for (int i = 1; i != arrayWidth - 1; ++i)
{
for (int j = 1;
j != arrayHeight - 1; ++j)
{
if (::cells[i-1][j-1]) ++neighbours[i][j];
if (::cells[i ][j-1]) ++neighbours[i][j];
if (::cells[i+1][j-1]) ++neighbours[i][j];
if (::cells[i-1][j ]) ++neighbours[i][j];
if (::cells[i+1][j ]) ++neighbours[i][j];
if (::cells[i-1][j+1]) ++neighbours[i][j];
if (::cells[i ][j+1]) ++neighbours[i][j];
if (::cells[i+1][j+1]) ++neighbours[i][j];
}
}
// update the cells (kill or give birth)
for (int i = 1; i != arrayWidth - 1; ++i)
{
for (int j = 1;
j != arrayHeight - 1; ++j)
{
if (::cells[i][j] == false && neighbours[i][j] == 3)
{
// new cell is born
setCell(i, j, true);
}
else if (::cells[i][j] == true &&
(neighbours[i][j] == 2 || neighbours[i][j] == 3))
{
// remains alive
}
else
{
// dies from overcrowding or loneliness or remains dead
setCell(i, j, false);
}
}
}
}
int main(int, char *argv[])
{
try
{
init(argv[0]);
// create the
control buttons
frame(".f")
-relief(raised) -borderwidth(1);
button(".f.clear") -text("Clear") -command(::clear);
button(".f.next") -text("Next") -command(nextStep);
pack(".f")
-side(bottom) -Tk::fill(x);
pack(".f.clear",
".f.next") -side(Tk::left) -pady(5) -expand(true);
// create the
canvas widget
canvas(".c")
-background("white")
-width(squareSize * arrayWidth)
-height(squareSize * arrayHeight);
pack(".c")
-side(top);
// create and
initialize the array of cells
for (int i = 0;
i != arrayWidth; ++i)
{
for (int j = 0; j != arrayHeight; ++j)
{
::cells[i][j] = false;
Point p1(i * squareSize, j * squareSize);
Point p2((i + 1) * squareSize, (j + 1) * squareSize);
string squareId(
".c" << create(rectangle, p1, p2)
-outline("black") -Tk::fill("white")
);
squares[i][j] = squareId;
}
}
// bind the
mouse click so that it is possible
// to interact
with the cells
bind(".c",
"<Button-1>", click, event_x, event_y);
wm(resizable,
".", false, false);
runEventLoop();
}
catch (exception const &e)
{
cerr <<
"Error: " << e.what() << '\n';
}
}
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