ui.c

#include "ui.h"
#include "load.h"

int Display_Application(int argc, char *argv[])
{

	SDL_Window *window;	// Declare a pointer, main window
	int width = 640;
	int height = 480;
	GLdouble dx = 0;
	GLdouble dy = 0;
	GLdouble zoom = 1.0;

	initNodesBounds(argv[1]);

	min_x = minx;
	max_x = maxx;
	min_y = miny;
	max_y = maxy;

	// Initialize SDL2
	if (SDL_Init(SDL_INIT_VIDEO) != 0) {
		fprintf(stderr, "SDL_Init failed: %s\n", SDL_GetError());
		exit(EXIT_FAILURE);
	}
	// Create an application window with the following settings:
	window = SDL_CreateWindow("OSM Renderer",	// window title
				  SDL_WINDOWPOS_UNDEFINED,	// initial x position
				  SDL_WINDOWPOS_UNDEFINED,	// initial y position
				  width,	// width, in pixels
				  height,	// height, in pixels
				  SDL_WINDOW_OPENGL | SDL_WINDOW_RESIZABLE	// flags
	    );

	// Check that the window was successfully created
	if (window == NULL) {
		// In the case that the window could not be made...
		fprintf(stderr, "SDL_CreateWindow failed: %s\n",
			SDL_GetError());
		exit(EXIT_FAILURE);
	}

	fprintf(stdout, "Press the 'F' key to switch fullscreen.\n");
	fprintf(stdout, "Press the 'R' key to reset the view.\n");
	fprintf(stdout, "Press the [x] button to close the window.\n");

	SDL_Renderer *displayRenderer = NULL;
	SDL_RendererInfo displayRendererInfo;
	displayRenderer =
	    SDL_CreateRenderer(window, -1, SDL_RENDERER_ACCELERATED);
	SDL_GetRendererInfo(displayRenderer, &displayRendererInfo);
	if ((displayRendererInfo.flags & SDL_RENDERER_ACCELERATED) == 0 ||
	    (displayRendererInfo.flags & SDL_RENDERER_TARGETTEXTURE) == 0) {
		fprintf(stderr,
			"We have no render surface and not accelerated.\n");
	}

	Display_InitGL();

	Display_SetViewport(width, height, dx, dy, zoom);

	int fullscreen = 0;
	int drag = 0;
	int xcursor = 0;
	int ycursor = 0;
	SDL_Event event;
	int quit = 0;
	time_t t = time(NULL);
	time_t ctime = time(NULL);
	int frames = 0;

	GList *l;

	for (l = g_hash_table_get_values(ways_hashtable); l != NULL;
	     l = l->next) {
		way *w = l->data;
		w->glist = tessellate(*w);
	}

	g_list_free(l);

	while (!quit) {
		Display_SetViewport(width, height, dx, dy, zoom);
		Display_Render(displayRenderer, width, height, dx, dy, zoom);
		while (SDL_PollEvent(&event))	// User's actions
		{
			switch (event.type) {
			case SDL_QUIT:	// Close button
				quit = 1;
				break;
			case SDL_KEYUP:	// Key release
				if (event.key.keysym.sym == SDLK_f)	// F key
				{
					if (fullscreen == 0) {
						fullscreen = 1;
						SDL_SetWindowFullscreen(window,
									SDL_WINDOW_FULLSCREEN);
					} else if (fullscreen == 1) {
						fullscreen = 0;
						SDL_SetWindowFullscreen(window,
									0);
					}
				}
				if (event.key.keysym.sym == SDLK_KP_PLUS) {
					if (zoom > 0.1) {
						dx = dx +
						    0.1 * pixelsize * (xcursor -
								       width /
								       2);
						dy = dy -
						    0.1 * pixelsize * (ycursor -
								       height /
								       2);
					}
					if (zoom > 0.1)
						zoom -= 0.1;
				}
				if (event.key.keysym.sym == SDLK_KP_MINUS) {
					dx = dx - 0.1 * pixelsize * (xcursor -
								     width / 2);
					dy = dy + 0.1 * pixelsize * (ycursor -
								     height /
								     2);
					zoom += 0.1;
				}
				if (event.key.keysym.sym == SDLK_r) {
					zoom = 1.0;
					dx = 0.0;
					dy = 0.0;
				}
				if (event.key.keysym.sym == SDLK_s) {
					if (showFrame)
						showFrame = 0;
					else
						showFrame = 1;
				}
				if (event.key.keysym.sym == SDLK_c) {
					screenshoot = 1;
				}
				if (event.key.keysym.sym == SDLK_p) {
					projection = !projection;
					if (projection) {
						min_x = minx;
						max_x = maxx;
						min_y = miny;
						max_y = maxy;
					} else {
						min_x = minlon;
						max_x = maxlon;
						min_y = minlat;
						max_y = maxlat;
					}
				}
				break;
			case SDL_WINDOWEVENT:
				switch (event.window.event) {
				case SDL_WINDOWEVENT_RESIZED:
					width = event.window.data1;
					height = event.window.data2;
					break;
				case SDL_WINDOWEVENT_SIZE_CHANGED:
					width = event.window.data1;
					height = event.window.data2;
					break;
				default:
					// printf("Window %d got unknown event %d\n", event.window.windowID, event.window.event);
					break;
				}
				break;
			case SDL_MOUSEBUTTONDOWN:
				if (event.button.button == SDL_BUTTON_LEFT)
					drag = 1;
				break;
			case SDL_MOUSEBUTTONUP:
				if (event.button.button == SDL_BUTTON_LEFT)
					drag = 0;
				break;
			case SDL_MOUSEMOTION:
				xcursor = event.motion.x;
				ycursor = event.motion.y;
				if (drag != 0) {
					dx -=
					    pixelsize * event.motion.xrel *
					    zoom;
					dy +=
					    pixelsize * event.motion.yrel *
					    zoom;
				}
				break;
			case SDL_MOUSEWHEEL:
				if (zoom > 0.01) {
					dx = dx +
					    0.02 * pixelsize * event.wheel.y *
					    (xcursor - width / 2);
					dy = dy -
					    0.02 * pixelsize * event.wheel.y *
					    (ycursor - height / 2);
				}
				if (event.wheel.y > 0 && zoom > 0.01)
					zoom -= 0.02;
				else if (event.wheel.y < 0)
					zoom += 0.02;
				break;
			default:
				//printf("unknown event");
				break;
			}
		}
		frames++;
		ctime = time(NULL);
		if (t != ctime) {
			t = ctime;
			//fprintf(stdout, "%d fps\n", frames);
			frames = 0;
		}
	}

	// Close and destroy the window
	SDL_DestroyWindow(window);

	// Clean up
	SDL_Quit();

	return EXIT_SUCCESS;
}