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The camera pans with the velocity of the ship, and added a window title.

This commit is contained in:
Barra Ó Catháin 2023-03-16 00:31:15 +00:00
parent 89befd110f
commit 5edab8d33c
6 changed files with 27 additions and 27 deletions
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Experiment-13-Images/Ship-Accelerating-Frame-2.png → Experiment-14-Images/Ship-Accelerating-Frame-2.png
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Experiment-13-Images/Ship-Accelerating.png → Experiment-14-Images/Ship-Accelerating.png
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Experiment-13-Images/Ship-Anticlockwise.png → Experiment-14-Images/Ship-Anticlockwise.png
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Experiment-13-Images/Ship-Clockwise.png → Experiment-14-Images/Ship-Clockwise.png
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Experiment-13-Images/Ship-Idle.png → Experiment-14-Images/Ship-Idle.png
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Spacewar.c
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@ -1,4 +1,4 @@
// SDL Experiment 13, Barra Ó Catháin. // SDL Experiment 14, Barra Ó Catháin.
// =================================== // ===================================
#include <SDL2/SDL.h> #include <SDL2/SDL.h>
#include <SDL2/SDL_image.h> #include <SDL2/SDL_image.h>
@ -133,11 +133,11 @@ void calculateGravity(xyVector * starPosition, ship * shipUnderGravity)
{ {
if(gravityMagnitude >= 116) if(gravityMagnitude >= 116)
{ {
gravityAcceleration = 0.1 * (35000 / (pow(gravityMagnitude, 2))); gravityAcceleration = 0.67 * (50000 / (pow(gravityMagnitude, 2)));
} }
else else
{ {
gravityAcceleration = 0; gravityAcceleration = 1;
} }
} }
else else
@ -198,16 +198,17 @@ int main(int argc, char ** argv)
// Create an SDL window and rendering context in that window: // Create an SDL window and rendering context in that window:
SDL_Window * window = SDL_CreateWindow("SDL_TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 700, 700, 0); SDL_Window * window = SDL_CreateWindow("SDL_TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 700, 700, 0);
SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, rendererFlags); SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, rendererFlags);
SDL_SetWindowTitle(window, "Spacewar!");
// Load in all of our textures: // Load in all of our textures:
SDL_Texture * idleTexture, * acceleratingTexture, * clockwiseTexture, * anticlockwiseTexture, * currentTexture, SDL_Texture * idleTexture, * acceleratingTexture, * clockwiseTexture, * anticlockwiseTexture, * currentTexture,
* acceleratingTexture2; * acceleratingTexture2;
idleTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Idle.png"); idleTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Idle.png");
clockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Clockwise.png"); clockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Clockwise.png");
acceleratingTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Accelerating.png"); acceleratingTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Accelerating.png");
anticlockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Anticlockwise.png"); anticlockwiseTexture = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Anticlockwise.png");
acceleratingTexture2 = IMG_LoadTexture(renderer, "./Experiment-13-Images/Ship-Accelerating-Frame-2.png"); acceleratingTexture2 = IMG_LoadTexture(renderer, "./Experiment-14-Images/Ship-Accelerating-Frame-2.png");
// Enable resizing the window: // Enable resizing the window:
SDL_SetWindowResizable(window, SDL_TRUE); SDL_SetWindowResizable(window, SDL_TRUE);
@ -292,22 +293,18 @@ int main(int argc, char ** argv)
if(shipA.position.xComponent > 4096) if(shipA.position.xComponent > 4096)
{ {
shipA.position.xComponent = -2000; shipA.position.xComponent = -2000;
shipA.velocity.xComponent *= 0.9;
} }
else if(shipA.position.xComponent < -4096) else if(shipA.position.xComponent < -4096)
{ {
shipA.position.xComponent = 2000; shipA.position.xComponent = 2000;
shipA.velocity.xComponent *= 0.9;
} }
if(shipA.position.yComponent > 4096) if(shipA.position.yComponent > 4096)
{ {
shipA.position.yComponent = -2000; shipA.position.yComponent = -2000;
shipA.velocity.yComponent *= 0.9;
} }
else if(shipA.position.yComponent < -4096) else if(shipA.position.yComponent < -4096)
{ {
shipA.position.yComponent = 2000; shipA.position.yComponent = 2000;
shipA.velocity.yComponent *= 0.9;
} }
if(shipB.position.xComponent > 4096) if(shipB.position.xComponent > 4096)
@ -373,11 +370,11 @@ int main(int argc, char ** argv)
addXYVectorDeltaScaled(&shipB.position, &shipB.velocity, deltaTime); addXYVectorDeltaScaled(&shipB.position, &shipB.velocity, deltaTime);
// Calculate the position of the sprites: // Calculate the position of the sprites:
shipA.rectangle.x = (width/2) - 16; shipA.rectangle.x = (width/2) - 16 - (shipA.velocity.xComponent * 15);
shipA.rectangle.y = (height/2) - 16; shipA.rectangle.y = (height/2) - 16 - (shipA.velocity.yComponent * 15);
shipB.rectangle.x = (long)(((shipB.position.xComponent - shipA.position.xComponent) - 32) + width/2); shipB.rectangle.x = (long)((((shipB.position.xComponent - shipA.position.xComponent) - 32) + width/2) - (shipA.velocity.xComponent * 15));
shipB.rectangle.y = (long)(((shipB.position.yComponent - shipA.position.yComponent) - 32) + height/2); shipB.rectangle.y = (long)((((shipB.position.yComponent - shipA.position.yComponent) - 32) + height/2) - (shipA.velocity.yComponent * 15));
// Set the colour to black: // Set the colour to black:
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255); SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
@ -395,13 +392,14 @@ int main(int argc, char ** argv)
SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255); SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);
// Draw a circle as the star: // Draw a circle as the star:
DrawCircle(renderer, (long)(starPositionX - shipA.position.xComponent) + width/2, DrawCircle(renderer, (long)(starPositionX - shipA.position.xComponent) + width/2 - (shipA.velocity.xComponent * 15),
(long)(starPositionY - shipA.position.yComponent) + height/2, 50); (long)(starPositionY - shipA.position.yComponent) + height/2 - (shipA.velocity.yComponent * 15), 50);
// Draw a line representing the velocity: // Draw a line representing the velocity:
SDL_RenderDrawLine(renderer, width/2, height/2, SDL_RenderDrawLine(renderer, width/2 - (shipA.velocity.xComponent * 15),
(long)((width/2) + shipA.velocity.xComponent * 15), height/2 - (shipA.velocity.yComponent * 15),
(long)((height/2) + shipA.velocity.yComponent * 15)); (long)((width/2) + shipA.velocity.xComponent * 15) - (shipA.velocity.xComponent * 15),
(long)((height/2) + shipA.velocity.yComponent * 15) - (shipA.velocity.yComponent * 15));
// Set the colour to blue: // Set the colour to blue:
SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255); SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
@ -409,16 +407,18 @@ int main(int argc, char ** argv)
// Draw a line representing the direction of the star: // Draw a line representing the direction of the star:
normalizeXYVector(&shipA.gravity); normalizeXYVector(&shipA.gravity);
multiplyXYVector(&shipA.gravity, 100); multiplyXYVector(&shipA.gravity, 100);
SDL_RenderDrawLine(renderer, width/2, height/2, SDL_RenderDrawLine(renderer,
(long)((width/2) + shipA.gravity.xComponent), width/2 - (shipA.velocity.xComponent * 15),
(long)((height/2) + shipA.gravity.yComponent)); height/2 - (shipA.velocity.yComponent * 15),
(width/2 - (shipA.velocity.xComponent * 15)) + shipA.gravity.xComponent,
((height/2) - (shipA.velocity.yComponent * 15)) + shipA.gravity.yComponent);
// Present the rendered graphics: // Present the rendered graphics:
SDL_RenderPresent(renderer); SDL_RenderPresent(renderer);
} }
return 0; return 0;
} }
// =========================================================================================== // ========================================================================================================
// Local Variables: // Local Variables:
// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-13.c -lSDL2_image -lm" // compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-14.c -lSDL2_image -lm -o 'Spacewar!'"
// End: // End: