Added a texture for the ship.

This commit is contained in:
Barra Ó Catháin 2023-03-16 00:12:22 +00:00
parent e828b4b70a
commit 0b1ea56db7
5 changed files with 47 additions and 19 deletions

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10-Ship-Accelerating.png Normal file

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10-Ship-Anticlockwise.png Normal file

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10-Ship-Clockwise.png Normal file

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10-Ship-Idle.png Normal file

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@ -1,6 +1,7 @@
// SDL Experiment 09, Barra Ó Catháin.
// SDL Experiment 10, Barra Ó Catháin.
// ===================================
#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_timer.h>
#include <math.h>
#include <stdbool.h>
@ -28,6 +29,15 @@ static inline double normalizeXYVector(xyVector * vector)
return magnitude;
}
// Get the angle between vectors:
static inline double angleBetweenVectors(xyVector * vectorA, xyVector * vectorB)
{
double dotProduct = (vectorA->xComponent * vectorB->xComponent) + (vectorA->yComponent * vectorB->yComponent);
double determinant = (vectorA->xComponent * vectorB->yComponent) - (vectorA->yComponent * vectorB->xComponent);
return atan2(dotProduct, determinant) / 0.01745329;
}
static inline void rotateXYVector(xyVector * vector, double degrees)
{
double xComponent = vector->xComponent, yComponent = vector->yComponent;
@ -102,18 +112,36 @@ int main(int argc, char ** argv)
double deltaTime = 0, gravityMagnitude = 0, gravityAcceleration = 0;
uint64_t thisFrameTime = SDL_GetPerformanceCounter(), lastFrameTime = 0;
bool quit = false, rotatingClockwise = false, rotatingAnticlockwise = false, accelerating = false;
xyVector positionVector = {100, 100}, velocityVector = {0, 0}, gravityVector = {0, 0}, engineVector = {0.1, 0};
xyVector positionVector = {100, 100}, velocityVector = {0, 0}, gravityVector = {0, 0}, engineVector = {0.1, 0}, upVector = {0, 0.1};
// Initialize the SDL library, video, sound, and input:
if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
{
printf("SDL Initialization Error: %s\n", SDL_GetError());
}
// Initialize image loading:
IMG_Init(IMG_INIT_PNG);
SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "2");
// Create a rectangle to put the ship in:
SDL_Rect shipRect;
shipRect.w = 32;
shipRect.h = 32;
// Create an SDL window and rendering context in that window:
SDL_Window * window = SDL_CreateWindow("SDL_TEST", SDL_WINDOWPOS_CENTERED, SDL_WINDOWPOS_CENTERED, 640, 640, 0);
SDL_Renderer * renderer = SDL_CreateRenderer(window, -1, rendererFlags);
// Load in all of our textures:
SDL_Texture * idleTexture, * acceleratingTexture, * clockwiseTexture, * anticlockwiseTexture, * currentTexture;
idleTexture = IMG_LoadTexture(renderer, "./10-Ship-Idle.png");
clockwiseTexture = IMG_LoadTexture(renderer, "./10-Ship-Clockwise.png");
acceleratingTexture = IMG_LoadTexture(renderer, "./10-Ship-Accelerating.png");
anticlockwiseTexture = IMG_LoadTexture(renderer, "./10-Ship-Anticlockwise.png");
// Enable resizing the window:
SDL_SetWindowResizable(window, SDL_TRUE);
@ -230,14 +258,20 @@ int main(int argc, char ** argv)
positionVector.yComponent = height;
velocityVector.yComponent *= 0.6;
}
// Set the texture to idle:
currentTexture = idleTexture;
// Rotate the engine vector if needed:
if(rotatingClockwise)
{
rotateXYVector(&engineVector, 0.1);
rotateXYVector(&engineVector, 0.1 * deltaTime);
currentTexture = clockwiseTexture;
}
if(rotatingAnticlockwise)
{
rotateXYVector(&engineVector, -0.1);
rotateXYVector(&engineVector, -0.1 * deltaTime);
currentTexture = anticlockwiseTexture;
}
// Calculate the new current velocity:
@ -245,6 +279,7 @@ int main(int argc, char ** argv)
if(accelerating)
{
addXYVectorDeltaScaled(&velocityVector, &engineVector, deltaTime);
currentTexture = acceleratingTexture;
}
// Calculate the new position:
@ -253,17 +288,18 @@ int main(int argc, char ** argv)
positionX = (long)positionVector.xComponent;
positionY = (long)positionVector.yComponent;
// Calculate the position of the sprite:
shipRect.x = positionX - 15;
shipRect.y = positionY - 15;
// Set the colour to black:
SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255);
// Clear the screen, filling it with black:
SDL_RenderClear(renderer);
// Set the colour to green:
SDL_SetRenderDrawColor(renderer, 0, 255, 0, 255);
// Draw a circle "ship" around the current position:
DrawCircle(renderer, positionX, positionY, 15);
// Draw the ship:
SDL_RenderCopyEx(renderer, currentTexture, NULL, &shipRect, angleBetweenVectors(&engineVector, &upVector) + 90, NULL, 0);
// Set the colour to yellow:
SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);
@ -276,14 +312,6 @@ int main(int argc, char ** argv)
(long)(positionVector.xComponent + velocityVector.xComponent * 15),
(long)(positionVector.yComponent + velocityVector.yComponent * 15));
// Set the colour to blue:
SDL_SetRenderDrawColor(renderer, 0, 0, 255, 255);
// Draw a line showing the direction the engine will accelerate:
SDL_RenderDrawLine(renderer, positionX, positionY,
(long)(positionVector.xComponent + engineVector.xComponent * 300),
(long)(positionVector.yComponent + engineVector.yComponent * 300));
// Present the rendered graphics:
SDL_RenderPresent(renderer);
}
@ -291,5 +319,5 @@ int main(int argc, char ** argv)
}
// ===========================================================================================
// Local Variables:
// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-09.c -lm"
// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-10.c -lSDL2_image -lm"
// End: