private static void Main(string[] args)
{
// initialize SDL video
if (SDL.SDL_Init(SDL.SDL_INIT_VIDEO) != 0)
{
SDL.SDL_ShowSimpleMessageBox(SDL.SDL_MessageBoxFlags.SDL_MESSAGEBOX_ERROR, "SDL_Init()", SDL.SDL_GetError(), IntPtr.Zero);
return;
}
IsRunning = true;
// build SDL window and renderer
SDL2Window window = new SDL2Window("Demo", SDL.SDL_WINDOWPOS_CENTERED, SDL.SDL_WINDOWPOS_CENTERED, 640, 480, SDL.SDL_WindowFlags.SDL_WINDOW_RESIZABLE);
SDL2Renderer renderer = new SDL2Renderer(window, -1, SDL.SDL_RendererFlags.SDL_RENDERER_PRESENTVSYNC);
// set logical resolution for automatic scaling (letterboxing at larger resolutions)
RenderLogicalWidth = 640;
RenderLogicalHeight = 480;
renderer.RenderSetLogicalSize(640, 480);
uint currentTic = 0;
uint currentFrame = 0;
uint previousTime = SDL.SDL_GetTicks();
uint lag = 0;
// initialize demo state machine into "edit" mode
// i.e. "place obstacles and traffic lanes" mode
StateMachine stateMachine = new StateMachine();
EditState editState = new EditState(stateMachine);
stateMachine.PushState(editState);
// demo time!
while (IsRunning)
{
// Uh, won't this overflow eventually?
uint currentTime = SDL.SDL_GetTicks();
uint elapsedTime = currentTime - previousTime;
previousTime = currentTime;
lag += elapsedTime;
// input
stateMachine.DoEvents();
// fixed logic rate
while (lag >= MillisecondsPerTic)
{
// logic
stateMachine.DoLogic(currentTic);
lag -= MillisecondsPerTic;
currentTic++;
}
// render
renderer.SetRenderDrawColor(0, 0, 0, 255);
renderer.RenderClear();
// recalculate ms per tic as a double value
stateMachine.DoRender(lag / (1000.0 / TicsPerSecond), renderer);
renderer.RenderPresent();
currentFrame++;
}
// dipose SDL resources
window.Dispose();
renderer.Dispose();
// uninitialize SDL
SDL.SDL_Quit();
}
private void DrawTraffic(SDL2Renderer renderer)
{
foreach (var lane in TrafficLanes)
{
// lanes are red
renderer.SetRenderDrawColor(255, 0, 0, 255);
renderer.RenderDrawLine(lane.Origin.x, lane.Origin.y, lane.EndPoint.x, lane.EndPoint.y);
}
}
public void DoRender(double interpolation, SDL2Renderer renderer)
{
if (SignaledState == SignalState.None)
renderer.SetRenderDrawColor(255, 255, 255, 255);
else if (SignaledState == SignalState.ReceivedDeciding)
renderer.SetRenderDrawColor(255, 255, 0, 255);
else if (SignaledState == SignalState.ReceivedTransmitting)
renderer.SetRenderDrawColor(255, 0, 0, 255);
else if (SignaledState == SignalState.ReceivedNotTransmitting)
renderer.SetRenderDrawColor(255, 127, 0, 255);
int lerpX = (int)(Position.x + (Velocity.x * interpolation));
int lerpY = (int)(Position.y + (Velocity.y * interpolation));
//renderer.RenderDrawPoint(lerpX, lerpY);
renderer.RenderFillRect(new SDL.SDL_Rect { x = lerpX - 2, y = lerpY - 2, w = 5, h = 5 });
}
private void DrawEditingPoints(SDL2Renderer renderer)
{
// draw points
if (FirstPoint != null)
{
// green
renderer.SetRenderDrawColor(0, 255, 0, 255);
renderer.RenderDrawPoint(FirstPoint.Item1, FirstPoint.Item2);
}
if (SecondPoint != null)
{
renderer.SetRenderDrawColor(0, 255, 0, 255);
renderer.RenderDrawPoint(SecondPoint.Item1, SecondPoint.Item2);
}
}
private void DrawSquares(SDL2Renderer renderer)
{
// draw squares
foreach (SDL.SDL_Rect rect in Squares)
{
// squares are blue
renderer.SetRenderDrawColor(0, 0, 255, 255);
renderer.RenderDrawRect(rect);
}
}
private void DrawCrosshairs(SDL2Renderer renderer)
{
int mouseX;
int mouseY;
// color based on mode
if (CurrentMode == EditorMode.None)
// white
renderer.SetRenderDrawColor(255, 255, 255, 255);
else
// red
renderer.SetRenderDrawColor(255, 0, 0, 255);
// draw the crosshair
Util.GetVirtualMouseCoordinates(out mouseX, out mouseY);
// horizontal line
renderer.RenderDrawLine(0, mouseY, Program.RenderLogicalWidth - 1, mouseY);
// vertical line
renderer.RenderDrawLine(mouseX, 0, mouseX, Program.RenderLogicalHeight - 1);
// lane deletion region
renderer.RenderDrawRect(new SDL.SDL_Rect { x = mouseX - 5, y = mouseY - 5, w = 11, h = 11 });
}
public void DoRender(double interpolation, SDL2Renderer renderer)
{
DrawSquares(renderer);
DrawEditingPoints(renderer);
DrawTraffic(renderer);
DrawCrosshairs(renderer);
}
private void DrawVehicles(double interpolation, SDL2Renderer renderer)
{
foreach (Vehicle vehicle in Vehicles)
{
vehicle.DoRender(interpolation, renderer);
}
}
private void DrawSignal(SDL2Renderer renderer)
{
if (EmergencyVehicle != null)
{
renderer.SetRenderDrawColor(0, 255, 0, 255);
renderer.RenderDrawPoint((int)EmergencyVehicle.Position.x, (int)EmergencyVehicle.Position.y);
SDL.SDL_Point[] signalRadius = Util.GenerateCircularPolygon(16, EmergencyVehicle.LastSignal.EmergencyRadius);
Util.TranslatePoints(signalRadius, (int)EmergencyVehicle.Position.x, (int)EmergencyVehicle.Position.y);
renderer.RenderDrawLines(signalRadius);
}
}
public void DoRender(double interpolation, SDL2Renderer renderer)
{
DrawSquares(renderer);
DrawSignal(renderer);
DrawVehicles(interpolation, renderer);
}