From: DeaDDooMER <deaddoomer@deadsoftware.ru>
Date: Tue, 4 Apr 2017 17:49:30 +0000 (+0300)
Subject: Добавлена звезда и гравитация
X-Git-Url: https://deadsoftware.ru/gitweb?p=netwar.git;a=commitdiff_plain;h=f23bc975650813d88a819d403e1b9e1795086242

Добавлена звезда и гравитация
---

diff --git a/game.c b/game.c
index 36dccb4..3acaa36 100644
--- a/game.c
+++ b/game.c
@@ -13,6 +13,11 @@
 #define MAX_SPEED  (0.3 / TICK)
 #define MAX_ROTATE (0.3 / TICK)
 
+// Цифры взяты с потолка, но вроде неплохо подобраны
+#define G      3.673e-4
+#define M_STAR 10.0
+#define M_SHIP 0.1
+
 Player g_player[MAX_PLAYERS];
 Bullet g_bullet[MAX_BULLETS];
 
@@ -95,9 +100,17 @@ static void checkspacebound(float * a) {
 	*a = x;
 }
 
+static float length(float x1, float y1, float x2, float y2) {
+	return sqrtf(powf(x1 - x2, 2) + powf(y1 - y2, 2));
+}
+
 static bool collide(float x1, float y1, float r1, float x2, float y2, float r2) {
-	float l = sqrtf(powf(x1 - x2, 2) + powf(y1 - y2, 2));
-	return ((l - r1 - r2) <= 0);
+	return ((length(x1, y1, x2, y2) - r1 - r2) <= 0);
+}
+
+static void gravity(float * vx, float * vy, float x, float y) {
+	*vx += copysign(G * M_STAR * M_SHIP / length(0, 0, x, y), x * -1);
+	*vy += copysign(G * M_STAR * M_SHIP / length(0, 0, x, y), y * -1);
 }
 
 void g_player_does(unsigned int id, DoesBits code) {
@@ -122,12 +135,18 @@ void g_update() {
 			g_player[i].x += g_player[i].vx;
 			g_player[i].y += g_player[i].vy;
 			g_player[i].r += g_player[i].vr;
+
+			gravity(&g_player[i].vx, &g_player[i].vy, g_player[i].x, g_player[i].y);
+
 			checkspacebound(&g_player[i].x);
 			checkspacebound(&g_player[i].y);
 
 			++g_player[i].shoot;
 			if(g_player[i].shoot > PLAYER_SHOOT)
 				g_player[i].shoot = PLAYER_SHOOT;
+
+			if(collide(g_player[i].x, g_player[i].y, PLAYER_SIZE, 0, 0, STAR_SIZE))
+				g_player[i].live = false;
 		}
 	}
 
diff --git a/game.h b/game.h
index ea505cf..e41bb05 100644
--- a/game.h
+++ b/game.h
@@ -7,9 +7,11 @@
 #define TICK         24                  // Количество обновлений мира в секунду
 #define TICK_DELAY   (1000 / TICK)       // Задержка между тиками
 #define BULLET_TIME  (TICK * 6)          // Время жизни игрока
-#define PLAYER_SIZE  0.01785             // Радиус игрока
 #define PLAYER_SHOOT ((int)(TICK * 0.8)) // Задержка между выстрелами
 
+#define PLAYER_SIZE  0.01785 // Радиус игрока
+#define STAR_SIZE    0.1    // Радиус звезды
+
 typedef struct Player {
 	/* public */
 	bool  live;
diff --git a/netwar.c b/netwar.c
index a3236f1..44e8725 100644
--- a/netwar.c
+++ b/netwar.c
@@ -12,10 +12,19 @@
 #define HEIGHT 480
 
 static const float ship[] = {
-	+1.0, +0.0,	-1.0, -1.0,
-	-1.0, -1.0,	+0.0, +0.0,
-	+0.0, +0.0,	-1.0, +1.0,
-	-1.0, +1.0,	+1.0, +0.0,
+	+1.0, +0.0,
+	-1.0, -1.0,
+	+0.0, +0.0,
+	-1.0, +1.0,
+	+1.0, +0.0,
+};
+
+static const float star[] = {
+	+1.0, +0.0,
+	+0.0, -1.0,
+	-1.0, +0.0,
+	+0.0, +1.0,
+	+1.0, +0.0,	
 };
 
 static char     * host = "localhost";
@@ -78,13 +87,35 @@ static void closewindow() {
 	SDL_DestroyWindow(window);
 }
 
+static void paintmodel(const float * model, int modelsz, float mx, float my, float r, float size, int cx, int cy) {
+	int scale = (WIDTH + HEIGHT) / 2 * size;
+
+	int count = modelsz / sizeof(model[0]) / 2;
+	int x = mx * WIDTH  / 2;
+	int y = my * HEIGHT / 2;
+
+	SDL_Point pix[count];
+	for(int j = 0; j < count * 2; j += 2) {
+		float c = cos(r * 2 * M_PI);
+		float s = sin(r * 2 * M_PI);
+		float rx = model[j + 0] * scale;
+		float ry = model[j + 1] * scale;
+		pix[j / 2].x = cx + x + (c * rx - s * ry);
+		pix[j / 2].y = cy + y + (s * rx + c * ry);
+	}	
+
+	SDL_RenderDrawLines(renderer, pix, count);
+}
+
 static void paintwindow() {
 	SDL_SetRenderDrawColor(renderer, 0x00, 0x00, 0x00, 0x00);
 	SDL_RenderClear(renderer);
 
 	int cx = WIDTH / 2;
 	int cy = HEIGHT / 2;
-	int shipsz = (WIDTH + HEIGHT) / 2 * PLAYER_SIZE;
+
+	SDL_SetRenderDrawColor(renderer, 0x00, 0xFF, 0xFF, 0x00);
+	paintmodel(star, sizeof(star), 0, 0, 0, STAR_SIZE, cx, cy);
 
 	for(int i = 0; i < MAX_PLAYERS; i++) {
 		if(i == cl_playerid)
@@ -92,22 +123,8 @@ static void paintwindow() {
 		else
 			SDL_SetRenderDrawColor(renderer, 0xFF, 0x00, 0x00, 0x00);
 
-		int count = sizeof(ship) / sizeof(ship[0]) / 2;
-		int x = g_player[i].x * WIDTH  / 2;
-		int y = g_player[i].y * HEIGHT / 2;
-
-		SDL_Point pixship[count];
-		for(int j = 0; j < count * 2; j += 2) {
-			float c = cos(g_player[i].r * 2 * M_PI);
-			float s = sin(g_player[i].r * 2 * M_PI);
-			float rx = ship[j + 0] * shipsz;
-			float ry = ship[j + 1] * shipsz;
-			pixship[j / 2].x = cx + x + (c * rx - s * ry);
-			pixship[j / 2].y = cy + y + (s * rx + c * ry);
-		}
-
 		if(g_player[i].live)
-			SDL_RenderDrawLines(renderer, pixship, count);
+			paintmodel(ship, sizeof(ship), g_player[i].x, g_player[i].y, g_player[i].r, PLAYER_SIZE, cx, cy);
 	}
 
 	for(int i = 0; i < MAX_BULLETS; i++) {