added collision engine, more or less stole gameplay from sdl-test7

[sdl-test8.git] / src / app / Application.cpp

diff --git a/src/app/Application.cpp b/src/app/Application.cpp
new file mode 100644 (file)
index 0000000..bcf4f29
--- /dev/null
+++ b/src/app/Application.cpp
@@ -0,0 +1,119 @@
+/*
+ * Application.cpp
+ *
+ *  Created on: Apr 8, 2012
+ *      Author: holy
+ */
+
+#include "Application.h"
+
+#include "State.h"
+
+#include <cassert>
+
+namespace app {
+
+Application::Application(sdl::InitScreen *screen, State *initialState)
+: screen(screen)
+, states()
+, timer()
+, last(SDL_GetTicks()) {
+       assert(screen && "cannot create application without screen");
+       assert(initialState && "cannot create application without initial state");
+       RealPushState(initialState);
+}
+
+Application::~Application(void) {
+       PopAllStates();
+}
+
+
+State *Application::CurrentState(void) {
+       return states.top();
+}
+
+void Application::ChangeState(State *s) {
+       RealPopState();
+       RealPushState(s);
+}
+
+void Application::PushState(State *s) {
+       RealPushState(s);
+}
+
+void Application::RealPushState(State *s) {
+       states.push(s);
+       s->EnterState(this, screen->Screen());
+}
+
+void Application::PopState(void) {
+       RealPopState();
+}
+
+void Application::RealPopState(void) {
+       if (states.empty()) return;
+       states.top()->ExitState();
+       delete states.top();
+       states.pop();
+}
+
+void Application::Quit(void) {
+       PopAllStates();
+}
+
+void Application::PopAllStates(void) {
+       while (!states.empty()) {
+               RealPopState();
+       }
+}
+
+
+void Application::Run(void) {
+       while (CurrentState()) {
+               Loop();
+       }
+}
+
+void Application::Loop(void) {
+       Uint32 now(SDL_GetTicks());
+       Uint32 deltaT(now - last);
+       if (deltaT > 34) deltaT = 34;
+
+       HandleEvents();
+       UpdateWorld(deltaT);
+       Render();
+
+       last = now;
+}
+
+
+void Application::HandleEvents(void) {
+       if (!CurrentState()) return;
+       SDL_Event event;
+       while (SDL_PollEvent(&event)) {
+               switch (event.type) {
+                       case SDL_QUIT:
+                               PopAllStates();
+                               break;
+                       default:
+                               CurrentState()->HandleEvent(event);
+                               break;
+               }
+       }
+}
+
+void Application::UpdateWorld(Uint32 deltaT) {
+       if (!CurrentState()) return;
+       for (Uint32 i(0); i < deltaT; ++i) {
+               timer.Update(0.001);
+               CurrentState()->UpdateWorld(timer);
+       }
+}
+
+void Application::Render(void) {
+       if (!CurrentState()) return;
+       CurrentState()->Render(screen->Screen());
+       screen->Flip();
+}
+
+}