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Adapted the previous example to do basic gravity and bouncing.

This commit is contained in:
Barra Ó Catháin 2023-03-15 23:24:42 +00:00
parent 53a88025cd
commit 6f966fec57
1 changed files with 14 additions and 17 deletions
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31
SDL2-Experiment-03.c → SDL2-Experiment-04.c
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@ -1,4 +1,4 @@
// SDL Experiment 03, Barra Ó Catháin. // SDL Experiment 04, Barra Ó Catháin.
// =================================== // ===================================
#include <SDL2/SDL.h> #include <SDL2/SDL.h>
#include <SDL2/SDL_timer.h> #include <SDL2/SDL_timer.h>
@ -181,18 +181,12 @@ int main(int argc, char ** argv)
{ {
velocityX = 10; velocityX = 10;
} }
if(velocityY > 10)
{
velocityY = 10;
}
if(velocityX < -10) if(velocityX < -10)
{ {
velocityX = -10; velocityX = -10;
} }
if(velocityY < -10)
{
velocityY = -10;
}
// Deccelerate: // Deccelerate:
if(velocityX != 0) if(velocityX != 0)
@ -200,10 +194,16 @@ int main(int argc, char ** argv)
velocityX = (velocityX < 0) ? velocityX + 1 : velocityX - 1; velocityX = (velocityX < 0) ? velocityX + 1 : velocityX - 1;
} }
if(velocityY != 0) if(positionY < 640)
{ {
velocityY = (velocityY < 0) ? velocityY + 1 : velocityY - 1; velocityY += 1;
} }
if(positionY >= 640 && velocityY !=0 && !accelUp)
{
velocityY *= -1;
velocityY += 1;
}
// Move the position: // Move the position:
if(velocityX != 0) if(velocityX != 0)
@ -211,11 +211,11 @@ int main(int argc, char ** argv)
positionX += velocityX; positionX += velocityX;
if(positionX < 0) if(positionX < 0)
{ {
positionX = 0; positionX = 640;
} }
if(positionX > 640) if(positionX > 640)
{ {
positionX = 640; positionX = 0;
} }
} }
if(velocityY != 0) if(velocityY != 0)
@ -243,9 +243,6 @@ int main(int argc, char ** argv)
// Set the colour to yellow: // Set the colour to yellow:
SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255); SDL_SetRenderDrawColor(renderer, 255, 255, 0, 255);
// Draw a line from the center of the window to the position pointer:
SDL_RenderDrawLine(renderer, width/2, height/2, positionX, positionY);
// Draw a circle around the position pointer: // Draw a circle around the position pointer:
DrawCircle(renderer, positionX, positionY, 15); DrawCircle(renderer, positionX, positionY, 15);
@ -259,5 +256,5 @@ int main(int argc, char ** argv)
} }
// =========================================================================================== // ===========================================================================================
// Local Variables: // Local Variables:
// compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-03.c -lm" // compile-command: "gcc `sdl2-config --libs --cflags` SDL2-Experiment-04.c -lm"
// End: // End: