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added diffusion and advection

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This commit is contained in:
Lauchmelder 2021-12-10 02:52:16 +01:00
parent 3b25635c19
commit 4eebb5821d
8 changed files with 224 additions and 39 deletions
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40
src/Application.cpp
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@ -35,41 +35,16 @@ Application::Application(int width, int height, const char* title)
return;
}
// Construct dummy velocity field
// TODO: Remove eventually
int fieldSize = 39;
double curl1 = -1.0;
double curl2 = 1.0;
std::vector<double> hori(fieldSize * fieldSize);
std::vector<double> vert(fieldSize * fieldSize);
SDL_SetRenderDrawBlendMode(renderer, SDL_BLENDMODE_BLEND);
for (int y = 0; y < fieldSize; y++)
{
for (int x = 0; x < fieldSize; x++)
{
// map internal coords to "real world" coordinates
double realX = -2.0 + (4.0 / (double)fieldSize) * (double)x;
double realY = -2.0 + (4.0 / (double)fieldSize) * (double)y;
// hori[y * fieldSize + x] = -(realX + 1.0) / sqrt((realX + 1.0) * (realX + 1.0) + (realY + 1.0) * (realY + 1.0)) + (realX - 1.0) / sqrt((realX - 1.0) * (realX - 1.0) + (realY - 1.0) * (realY - 1.0));
// vert[y * fieldSize + x] = (realY + 1.0) / sqrt((realX + 1.0) * (realX + 1.0) + (realY + 1.0) * (realY + 1.0)) - (realY - 1.0) / sqrt((realX - 1.0) * (realX - 1.0) + (realY - 1.0) * (realY - 1.0));
// hori[y * fieldSize + x] = realY / sqrt(realX * realX + realY * realY);
// vert[y * fieldSize + x] = -realX / sqrt(realX * realX + realY * realY);
// hori[y * fieldSize + x] = -realY;
// vert[y * fieldSize + x] = realX;
hori[y * fieldSize + x] = realY;
vert[y * fieldSize + x] = -realX - 1.0*realY;
}
}
velocity = VectorField(fieldSize, fieldSize, hori, vert);
field = new FluidField(60);
before = std::chrono::steady_clock::now();
}
Application::~Application()
{
delete field;
SDL_DestroyRenderer(renderer); // Let's just destroy this renderer regardless of other applications in this program :) what could go wrong
SDL_DestroyWindow(window);
}
@ -109,7 +84,10 @@ void Application::HandleEvents()
void Application::Update()
{
double frametime = std::chrono::duration_cast<std::chrono::duration<double>>(std::chrono::steady_clock::now() - before).count();
before = std::chrono::steady_clock::now();
field->DensityStep(0.0005, frametime);
}
void Application::Render()
@ -118,7 +96,7 @@ void Application::Render()
SDL_RenderClear(renderer);
velocity.Draw(renderer, {10, 10, 790, 790});
field->Draw(renderer, {10, 10, 990, 990});
SDL_RenderPresent(renderer);
}