102 lines
2.0 KiB
C
102 lines
2.0 KiB
C
#include "common.h"
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void ball_think (ball_t *b)
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{
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int8_t proj_x, proj_y, bounce;
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if (!b->strength)
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return;
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/* projection of the new coordinates */
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proj_x = (b->x + (b->dir_x)) / 256;
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proj_y = (b->y + (b->dir_y)) / 256;
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bounce = check_bounce (proj_x, b->y / 256);
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if (bounce & BOUNCE_UNDEF)
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bounce = (BOUNCE_X | bounce) & (BOUNCE_X | BOUNCE_Y);
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bounce |= check_bounce (b->x / 256, proj_y);
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if (bounce & BOUNCE_UNDEF)
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bounce = (BOUNCE_Y | bounce) & (BOUNCE_X | BOUNCE_Y);
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bounce |= check_bounce (proj_x, proj_y);
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if (bounce & BOUNCE_UNDEF)
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bounce = BOUNCE_X | BOUNCE_Y;
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/* ball fell out of the field */
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// if (proj_y >= NUM_ROWS)
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// ball_die (b);
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/* bounce in x direction */
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if (bounce & 0x01)
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{
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b->dir_x *= -1; /* invert x vector */
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b->dir_x ^= random8() & 0x0F; /* randomize bouncing */
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#if BOUNCE_SLOWDOWN
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if (b->dir_x < 0)
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{
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b->dir_x += BOUNCE_SLOWDOWN;
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} else
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{
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b->dir_x -= BOUNCE_SLOWDOWN;
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}
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#endif
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}
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/* bounce in y direction */
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if (bounce & 0x02)
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{
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b->dir_y *= -1; /* invert y vector */
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b->dir_y ^= random8() & 0x0F;
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#if BOUNCE_SLOWDOWN
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if (b->dir_y < 0)
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{
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b->dir_y += BOUNCE_SLOWDOWN;
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} else
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{
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b->dir_y -= BOUNCE_SLOWDOWN;
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}
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#endif
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}
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b->y += b->dir_y;
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b->x += b->dir_x;
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printf("B: %i %i, d: %i %i\n", b->x, b->y, b->dir_x, b->dir_y);
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}
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void ball_die (ball_t *in_b)
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{
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in_b->strength--;
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/* respawn ball with random direction */
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if (in_b->strength)
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ball_spawn (in_b, (NUM_COLS / 2) << 8, (NUM_ROWS-2) << 8, - random8(), random8(), START_LIFES);
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}
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void ball_draw (ball_t *b)
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{
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pixel p;
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p.x = (uint8_t) abs(b->x / 256);
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p.y = (uint8_t) abs(b->y / 256);
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printf("db: %i %i\n", p.x, p.y);
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setpixel (p, 3);
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}
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void ball_spawn (ball_t *in_ball, uint16_t in_x, uint16_t in_y, int16_t in_dir_x, int16_t in_dir_y, uint8_t in_strength)
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{
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printf ("spawn: %i %i, dir: %i, %i\n", in_x, in_y, in_dir_x, in_dir_y);
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in_ball->x = in_x;
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in_ball->y = in_y;
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in_ball->dir_x = in_dir_x;
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in_ball->dir_y = in_dir_y;
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in_ball->strength = in_strength;
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}
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