70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
#include <stdlib.h> // srand, rand
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#include <time.h> // time
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#include <math.h> // sin, cos, M_PI
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#include "ball.h"
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#include "racket.h"
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Ball*
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Ball_init(int screen_width, int screen_height)
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{
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srand(time(NULL));
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Ball *b = malloc(sizeof(Ball));
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*(int *)&b->BALL_WIDTH = 20;
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*(int *)&b->BALL_HEIGHT = 20;
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*(int *)&b->BALL_VELOCITY = 10;
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*(int *)&b->SCREEN_WIDTH = screen_width;
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*(int *)&b->SCREEN_HEIGHT = screen_height;
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Ball_reset(b, 1);
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return b;
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}
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void
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Ball_reset(Ball *b, int direction) {
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// 120 deg angle with norm horizontal vector
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const int angle = rand() % 60 + 60;
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b->posX = b->SCREEN_WIDTH/2;
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b->posY = b->SCREEN_HEIGHT/2;
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b->velX = direction * b->BALL_VELOCITY * cos(angle * 2 * M_PI / 180);
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b->velY = b->BALL_VELOCITY * sin(angle * 2 * M_PI / 180);
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}
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void
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Ball_free(Ball *b)
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{
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free(b);
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}
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int
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Ball_collision(const Ball *b, const Racket *r) {
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const int leftB = b->posX;
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const int rightB = leftB + b->BALL_WIDTH;
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const int upB = b->posY;
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const int downB = upB + b->BALL_HEIGHT;
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const int leftR = r->posX;
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const int rightR = leftR + r->RACKET_WIDTH;
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const int upR = r->posY;
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const int downR = upR + r->RACKET_HEIGHT;
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if(downB <= upR
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|| upB >= downR
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|| rightB <= leftR
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|| leftB >= rightR)
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{
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return false;
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}
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return true;
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}
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int
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Ball_render(const Ball *b, SDL_Renderer *renderer) {
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SDL_Rect rect = { b->posX, b->posY, b->BALL_WIDTH, b->BALL_HEIGHT };
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if (SDL_SetRenderDrawColor(renderer, 255, 255, 255, 255) < 0) {
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printf("SDL_SetRenderDrawColor failed! SDL_Error: %s\n", SDL_GetError());
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return 1;
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}
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SDL_RenderFillRect(renderer, &rect);
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return 0;
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//SDL_RenderCopy(renderer, b->texture, NULL, &rect);
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}
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