cannon.c
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#include "primlib.h"
#include <stdlib.h>
int main() {
if (gfx_init())
exit(3);
double angle = 90.0 * (M_PI/180.0);
double bullet_distance = 170.0;
while(1)
{
double delta_angle= 2.0 * (M_PI/180.0);
int x1 = 150 * cos(angle-delta_angle);
int y1 = 150 * sin(angle-delta_angle);
int x2 = 150 * cos(angle+delta_angle);
int y2 = 150 * sin(angle+delta_angle);
gfx_filledRect(0, 0, gfx_screenWidth() - 1, gfx_screenHeight() - 1, BLUE);
gfx_filledCircle(gfx_screenWidth() / 2, gfx_screenHeight(), 100, YELLOW);
gfx_filledTriangle(gfx_screenWidth() / 2, gfx_screenHeight() , gfx_screenWidth() / 2 + x1, gfx_screenHeight() - y1,
gfx_screenWidth() / 2 + x2, gfx_screenHeight() - y2, YELLOW);
int x_bullet = bullet_distance * cos(angle);
int y_bullet = bullet_distance * sin(angle);
gfx_filledCircle(gfx_screenWidth() / 2 + x_bullet, gfx_screenHeight() - y_bullet, 10, RED);
gfx_updateScreen();
bullet_distance += 1.0;
if(gfx_isKeyDown(SDLK_RIGHT))
angle -= 1.0 * (M_PI/180.0);
if(gfx_isKeyDown(SDLK_LEFT))
angle += 1.0 * (M_PI/180.0);
SDL_Delay(100);
};
return 0;
}