The camera pans with the velocity of the ship, and added a window title.
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54
Spacewar.c
54
Spacewar.c
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@ -1,4 +1,4 @@
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// SDL Experiment 13, Barra Ó Catháin.
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// SDL Experiment 14, Barra Ó Catháin.
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// ===================================
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#include <SDL2/SDL.h>
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#include <SDL2/SDL_image.h>
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@ -133,11 +133,11 @@ void calculateGravity(xyVector * starPosition, ship * shipUnderGravity)
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{
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if(gravityMagnitude >= 116)
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{
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gravityAcceleration = 0.1 * (35000 / (pow(gravityMagnitude, 2)));
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gravityAcceleration = 0.67 * (50000 / (pow(gravityMagnitude, 2)));
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}
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else
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{
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gravityAcceleration = 0;
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gravityAcceleration = 1;
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}
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}
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else
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@ -198,16 +198,17 @@ int main(int argc, char ** argv)
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// Create an SDL window and rendering context in that window:
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SDL_Window * window = SDL_CreateWindow("SDL_TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 700, 700, 0);
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SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, rendererFlags);
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SDL_SetWindowTitle(window, "Spacewar!");
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// Load in all of our textures:
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SDL_Texture * idleTexture, * acceleratingTexture, * clockwiseTexture, * anticlockwiseTexture, * currentTexture,
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* acceleratingTexture2;
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idleTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Idle.png");
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clockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Clockwise.png");
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acceleratingTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Accelerating.png");
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anticlockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Anticlockwise.png");
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acceleratingTexture2 = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Accelerating-Frame-2.png");
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idleTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Idle.png");
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clockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Clockwise.png");
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acceleratingTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Accelerating.png");
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anticlockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Anticlockwise.png");
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acceleratingTexture2 = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Accelerating-Frame-2.png");
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// Enable resizing the window:
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SDL_SetWindowResizable(window, SDL_TRUE);
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@ -292,22 +293,18 @@ int main(int argc, char ** argv)
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if(shipA.position.xComponent > 4096)
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{
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shipA.position.xComponent = -2000;
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shipA.velocity.xComponent *= 0.9;
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}
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else if(shipA.position.xComponent < -4096)
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{
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shipA.position.xComponent = 2000;
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shipA.velocity.xComponent *= 0.9;
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}
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if(shipA.position.yComponent > 4096)
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{
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shipA.position.yComponent = -2000;
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shipA.velocity.yComponent *= 0.9;
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}
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else if(shipA.position.yComponent < -4096)
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{
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shipA.position.yComponent = 2000;
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shipA.velocity.yComponent *= 0.9;
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}
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if(shipB.position.xComponent > 4096)
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@ -373,11 +370,11 @@ int main(int argc, char ** argv)
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addXYVectorDeltaScaled(&shipB.position, &shipB.velocity, deltaTime);
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// Calculate the position of the sprites:
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shipA.rectangle.x = (width/2) - 16;
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shipA.rectangle.y = (height/2) - 16;
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shipA.rectangle.x = (width/2) - 16 - (shipA.velocity.xComponent * 15);
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shipA.rectangle.y = (height/2) - 16 - (shipA.velocity.yComponent * 15);
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shipB.rectangle.x = (long)(((shipB.position.xComponent - shipA.position.xComponent) - 32) + width/2);
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shipB.rectangle.y = (long)(((shipB.position.yComponent - shipA.position.yComponent) - 32) + height/2);
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shipB.rectangle.x = (long)((((shipB.position.xComponent - shipA.position.xComponent) - 32) + width/2) - (shipA.velocity.xComponent * 15));
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shipB.rectangle.y = (long)((((shipB.position.yComponent - shipA.position.yComponent) - 32) + height/2) - (shipA.velocity.yComponent * 15));
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// Set the colour to black:
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SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
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@ -395,13 +392,14 @@ int main(int argc, char ** argv)
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SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);
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// Draw a circle as the star:
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DrawCircle(renderer, (long)(starPositionX - shipA.position.xComponent) + width/2,
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(long)(starPositionY - shipA.position.yComponent) + height/2, 50);
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DrawCircle(renderer, (long)(starPositionX - shipA.position.xComponent) + width/2 - (shipA.velocity.xComponent * 15),
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(long)(starPositionY - shipA.position.yComponent) + height/2 - (shipA.velocity.yComponent * 15), 50);
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// Draw a line representing the velocity:
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SDL_RenderDrawLine(renderer, width/2, height/2,
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(long)((width/2) + shipA.velocity.xComponent * 15),
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(long)((height/2) + shipA.velocity.yComponent * 15));
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SDL_RenderDrawLine(renderer, width/2 - (shipA.velocity.xComponent * 15),
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height/2 - (shipA.velocity.yComponent * 15),
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(long)((width/2) + shipA.velocity.xComponent * 15) - (shipA.velocity.xComponent * 15),
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(long)((height/2) + shipA.velocity.yComponent * 15) - (shipA.velocity.yComponent * 15));
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// Set the colour to blue:
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SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
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@ -409,16 +407,18 @@ int main(int argc, char ** argv)
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// Draw a line representing the direction of the star:
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normalizeXYVector(&shipA.gravity);
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multiplyXYVector(&shipA.gravity, 100);
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SDL_RenderDrawLine(renderer, width/2, height/2,
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(long)((width/2) + shipA.gravity.xComponent),
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(long)((height/2) + shipA.gravity.yComponent));
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SDL_RenderDrawLine(renderer,
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width/2 - (shipA.velocity.xComponent * 15),
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height/2 - (shipA.velocity.yComponent * 15),
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(width/2 - (shipA.velocity.xComponent * 15)) + shipA.gravity.xComponent,
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((height/2) - (shipA.velocity.yComponent * 15)) + shipA.gravity.yComponent);
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// Present the rendered graphics:
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SDL_RenderPresent(renderer);
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}
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return 0;
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}
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// ===========================================================================================
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// ========================================================================================================
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// Local Variables:
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// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-13.c -lSDL2_image -lm"
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// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-14.c -lSDL2_image -lm -o 'Spacewar!'"
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// End:
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