//
// Basic method to initialize the walkers to the source region defined
// by whatever ruleset is specified.
//
private void InitializeWalker(Walker new_walker)
{
int rndx = 100;
int rndy = 100;
switch(step_method)
{
default:
{ } break;
// Random box is a box from the upper left corner (inset by 10x10) to
// the lower left corner defined by the parameters in the UI. walkers
// will randomly initialize anywhere in this region
case StepMode.RANDOM_BOX:
{
rndx = rnd.Next(10, generate_x);
rndy = rnd.Next(10, generate_y);
} break;
// Random horizontal line, walkers will initialize on a line at
// generate_y, along the simulation region with a buffer of 50 pixels
// on each side
case StepMode.RANDOM_X_LINE:
{
rndx = rnd.Next(50, panel_width - 50);
rndy = generate_y;
} break;
// Similar to RANDOM_X_LINE except a vertical line.
case StepMode.RANDOM_Y_LINE:
{
rndx = generate_x;
rndy = rnd.Next(50, panel_height - 50);
} break;
// ADVANCE_Y, starts a horizontal block of walkers, but moves up as
// the simulation progresses. Initially I tried a horizontal line,
// but it was slower and had issues, the box seems to work a lot better.
case StepMode.ADVANCE_Y:
{
rndx = rnd.Next(50, panel_width - 50);
rndy = rnd.Next(generate_y - 20, generate_y);
} break;
// ADVANCE_X is similar to ADVANCE_Y. It's tricky to get the parameters
// right for this not to turn into a filled up source region. Remember to
// keep the deposition rate low enough, and the number of particles right.
case StepMode.ADVANCE_X:
{
rndx = rnd.Next(generate_x - 20, generate_x);
rndy = rnd.Next(50, panel_height - 50);
} break;
}
// Initialize the walker.
new_walker.x = rndx;
new_walker.y = rndy;
new_walker.state = ParticleState.ALIVE;
}
//
// Reset simply adjusts all the parameters, it will be called passing
// the current UI values to the class.
//
public void Reset(uint num_particles, double set_up_prob, double set_down_prob, double set_left_prob,
double set_right_prob, int set_y_line, int set_x_line, int set_deposition_rate)
{
// Up/Down and Left/Right have independant probability spaces.
// Any undefined region of probability will cause the particle
// to not move along that axis (which gives us 8 possible
// nearest-neighbor sites.)
up_probability = set_up_prob;
down_probability = 1.0f - set_down_prob;
left_probability = set_left_prob;
right_probability = 1.0f - set_right_prob;
// Pass parameters to the class
walkers.Clear();
number_of_walkers = num_particles;
generate_x = set_x_line;
generate_y = set_y_line;
last_deposit_x = set_x_line;
last_deposit_y = set_y_line;
deposit_y = 500;
deposit_x = 900;
// Initialize the walkers
for(int i = 0; i < number_of_walkers; i++)
{
Walker nwalk = new Walker(0,0);
InitializeWalker(nwalk);
walkers.Add(nwalk);
}
// Setup the initial cluster state
// Note, the cluster could also be setup as a
// list, which may lead to performance/memory
// improvements. However, coding time was
// a significt consideration, and it seemed
// easier/faster to impliment it this way.
for (int i = 0; i < panel_height; i++)
{
for (int j = 0; j < panel_width; j++)
{
if (i == (panel_height - 50))
{
pixels[j, i] = true;
}
else
{
pixels[j, i] = false;
}
}
}
deposit_rate = set_deposition_rate;
deposit_count = 0;
current_step = 0;
}