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// Geometric Tools, LLC
// Copyright (c) 1998-2014
// Distributed under the Boost Software License, Version 1.0.
// http://www.boost.org/LICENSE_1_0.txt
// http://www.geometrictools.com/License/Boost/LICENSE_1_0.txt
//
// File Version: 5.0.0 (2010/01/01)
#include "Fluids2D.h"
WM5_WINDOW_APPLICATION(Fluids2D);
//----------------------------------------------------------------------------
Fluids2D::Fluids2D ()
:
WindowApplication2("SamplePhysics/Fluids2D",0, 0, 512, 512,
Float4(0.9f, 0.9f, 0.9f, 1.0f)),
mTextColor(1.0f, 1.0f, 0.0f, 1.0f)
{
mSmoke = 0;
ColorRGB key[9] =
{
ColorRGB( 0, 0, 0), // black
ColorRGB(128, 64, 64), // brown
ColorRGB(128, 0, 255), // violet
ColorRGB( 0, 0, 255), // blue
ColorRGB( 0, 255, 0), // green
ColorRGB(255, 255, 0), // yellow
ColorRGB(255, 128, 0), // orange
ColorRGB(255, 0, 0), // red
ColorRGB(255, 255, 255) // white
};
for (int i = 0, j = 0; i < 8; ++i)
{
for (int k = 0; k < 32; ++k, ++j)
{
float t = k/32.0f;
float omt = 1.0f - t;
mColor[j].r = (unsigned char)(omt*key[i].r + t*key[i+1].r);
mColor[j].g = (unsigned char)(omt*key[i].g + t*key[i+1].g);
mColor[j].b = (unsigned char)(omt*key[i].b + t*key[i+1].b);
}
}
mSingleStep = false;
mDrawColored = false;
mDrawVortices = true;
}
//----------------------------------------------------------------------------
bool Fluids2D::OnInitialize ()
{
if (!WindowApplication2::OnInitialize())
{
return false;
}
float x0 = 0.0f;
float y0 = 0.0f;
float x1 = 1.0f;
float y1 = 1.0f;
float dt = 0.001f;
float denViscosity = 0.0001f;
float velViscosity = 0.0001f;
int imax = 255;
int jmax = 255;
int numGaussSeidelIterations = 32;
bool densityDirichlet = true;
int numVortices = 64;
mSmoke = new0 Smoke2D<float>(x0, y0, x1, y1, dt, denViscosity,
velViscosity, imax, jmax, numGaussSeidelIterations, densityDirichlet,
numVortices);
mSmoke->Initialize();
DoFlip(true);
OnDisplay();
return true;
}
//----------------------------------------------------------------------------
void Fluids2D::OnTerminate ()
{
delete0(mSmoke);
WindowApplication2::OnTerminate();
}
//----------------------------------------------------------------------------
void Fluids2D::OnDisplay ()
{
// Draw the density values.
int imax = mSmoke->GetIMax();
int jmax = mSmoke->GetJMax();
float** density = mSmoke->GetDensity();
for (int j = 0; j <= jmax; ++j)
{
for (int i = 0; i <= imax; ++i)
{
float value = density[j][i];
if (value > 1.0f)
{
value = 1.0f;
}
ColorRGB color;
if (mDrawColored)
{
color = mColor[(int)(255.0f*value)];
}
else
{
unsigned char gray = (unsigned char)(255.0f*value);
color.r = gray;
color.g = gray;
color.b = gray;
}
SetPixel(2*i, 2*j, color);
SetPixel(2*i+1, 2*j, color);
SetPixel(2*i, 2*j+1, color);
SetPixel(2*i+1, 2*j+1, color);
}
}
if (mDrawVortices)
{
// Draw the vortex centers, magenta for counterclockwise and cyan for
// clockwise.
const int numActive = mSmoke->GetNumActiveVortices();
float xMin = mSmoke->GetX0();
float yMin = mSmoke->GetY0();
float invXRange = 1.0f/(mSmoke->GetX1() - mSmoke->GetX0());
float invYRange = 1.0f/(mSmoke->GetY1() - mSmoke->GetY0());
for (int k = 0; k < numActive; ++k)
{
Vector2f center = mSmoke->GetVortexCenter(k);
int x = (int)((GetWidth()-1)*(center.X() - xMin)*invXRange);
int y = (int)((GetHeight()-1)*(center.Y() - yMin)*invYRange);
ColorRGB color;
if (mSmoke->GetVortexAmplitude(k) > 0.0f)
{
color.r = 255;
color.g = 0;
color.b = 255;
}
else
{
color.r = 0;
color.g = 255;
color.b = 255;
}
SetThickPixel(x, y, 1, color);
}
}
WindowApplication2::OnDisplay();
}
//----------------------------------------------------------------------------
void Fluids2D::ScreenOverlay ()
{
DrawFrameRate(8, GetHeight()-8, mTextColor);
}
//----------------------------------------------------------------------------
void Fluids2D::OnIdle ()
{
MeasureTime();
if (!mSingleStep)
{
mSmoke->DoSimulationStep();
OnDisplay();
}
UpdateFrameCount();
}
//----------------------------------------------------------------------------
bool Fluids2D::OnKeyDown (unsigned char key, int x, int y)
{
if (WindowApplication2::OnKeyDown(key, x, y))
{
return true;
}
switch (key)
{
case '0':
mSmoke->Initialize();
OnDisplay();
return true;
case ' ': // simulate
if (mSingleStep)
{
mSmoke->DoSimulationStep();
OnDisplay();
}
return true;
case 's':
case 'S':
mSingleStep = !mSingleStep;
return true;
case 'c':
case 'C':
mDrawColored = !mDrawColored;
return true;
case 'v':
case 'V':
mDrawVortices = !mDrawVortices;
return true;
case '+':
case '=':
{
int numActive = mSmoke->GetNumActiveVortices();
if (numActive < mSmoke->GetNumVortices())
{
mSmoke->SetNumActiveVortices(numActive + 1);
}
return true;
}
case '-':
case '_':
{
int numActive = mSmoke->GetNumActiveVortices();
if (numActive > 0)
{
mSmoke->SetNumActiveVortices(numActive - 1);
}
return true;
}
case 'g':
{
float gravity = mSmoke->GetGravity() - 0.1f;
if (gravity < 0.0f)
{
gravity = 0.0f;
}
mSmoke->SetGravity(gravity);
return true;
}
case 'G':
mSmoke->SetGravity(mSmoke->GetGravity() + 0.1f);
return true;
}
return false;
}
//----------------------------------------------------------------------------
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