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;
int is_shooting = 0;
double fire_angle;
int x_target = 0;
int y_target = 40;
while(1)
{
double delta_angle= 2.0 * (M_PI/180.0);
int x1_barrel= 150 * cos(angle-delta_angle);
int y1_barrel = 150 * sin(angle-delta_angle);
int x2_barrel = 150 * cos(angle+delta_angle);
int y2_barrel = 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_barrel, gfx_screenHeight() - y1_barrel,
gfx_screenWidth() / 2 + x2_barrel, gfx_screenHeight() - y2_barrel, YELLOW);
gfx_filledRect(x_target - 10, y_target - 10, x_target + 10, y_target + 10, MAGENTA);
if(is_shooting)
{
int x_bullet = bullet_distance * cos(fire_angle);
int y_bullet = bullet_distance * sin(fire_angle);
gfx_filledCircle(gfx_screenWidth() / 2 + x_bullet, gfx_screenHeight() - y_bullet, 10, RED);
}
gfx_updateScreen();
if(is_shooting)
bullet_distance += 5.0;
x_target += 3;
if(x_target > gfx_screenWidth())
x_target = 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);
if(gfx_isKeyDown(SDLK_SPACE))
{
is_shooting = 1;
bullet_distance = 170.0;
fire_angle = angle;
}
SDL_Delay(10);
};
return 0;
}