76 lines
1.8 KiB
C
76 lines
1.8 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, int posX_start)
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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_POSX_START = posX_start;
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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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int angle;
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do {
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angle = rand() % BALL_ANGLE_MAX_OFFSET*2 + BALL_ANGLE_MAX_OFFSET/2 - 90;
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} while (-BALL_ANGLE_MIN_OFFSET <= angle && angle <= BALL_ANGLE_MIN_OFFSET);
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if (direction < 0) {
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b->posX = b->BALL_POSX_START;
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}
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else {
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b->posX = b->SCREEN_WIDTH - b->BALL_POSX_START;
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}
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b->posY = b->SCREEN_HEIGHT/2;
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b->velX = -direction * BALL_VELOCITY * cos(angle * M_PI / 180);
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b->velY = BALL_VELOCITY * sin(angle * 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 + BALL_WIDTH;
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const int upB = b->posY;
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const int downB = upB + BALL_HEIGHT;
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const int leftR = r->posX;
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const int rightR = leftR + RACKET_WIDTH;
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const int upR = r->posY;
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const int downR = upR + 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, BALL_WIDTH, 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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