Michael Hayes
12 years ago
parent
36d8c942e2
commit
9949c1c89e
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#include <stdlib.h>
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#include "things.h"
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#include "tinygl.h"
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/* Number of initial objects. */
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#define THINGS_NUM 6
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#define SAFE_DISTANCE 3
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#define ANXIETY_LEVEL 2
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#define PANIC_LEVEL 50
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#define MOVE_ATTEMPTS 12
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typedef struct thing_struct
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{
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tinygl_point_t pos;
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uint8_t anxiety;
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bool alive;
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} thing_t;
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static thing_t things[THINGS_NUM];
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bool things_killed_p (void)
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{
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uint8_t i;
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for (i = 1; i < THINGS_NUM; i++)
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{
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if (things[i].alive)
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return 0;
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}
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return 1;
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}
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static int8_t thing_find (tinygl_point_t pos)
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{
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uint8_t i;
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for (i = 0; i < THINGS_NUM; i++)
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{
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if (things[i].pos.x == pos.x
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&& things[i].pos.y == pos.y
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&& things[i].alive)
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return i;
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}
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return -1;
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}
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static uint8_t thing_distance_squared (thing_t *things, uint8_t this)
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{
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int8_t dx;
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int8_t dy;
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dx = things[this].pos.x - things[0].pos.x;
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dy = things[this].pos.y - things[0].pos.y;
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return dx * dx + dy * dy;
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}
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static bool thing_inbounds_p (tinygl_point_t pos)
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{
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return pos.x >= 0 && pos.x < TINYGL_WIDTH
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&& pos.y >= 0 && pos.y < TINYGL_HEIGHT;
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}
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static bool thing_position_valid_p (tinygl_point_t pos)
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{
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return thing_inbounds_p (pos) && thing_find (pos) == -1;
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}
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void monster_move (int8_t dx, int8_t dy)
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{
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int8_t other;
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tinygl_point_t newpos;
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newpos = tinygl_point (things[0].pos.x + dx, things[0].pos.y + dy);
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if (!thing_inbounds_p (newpos))
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return;
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other = thing_find (newpos);
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if (other != -1)
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things[other].alive = 0;
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tinygl_draw_point (things[0].pos, 0);
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things[0].pos = newpos;
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tinygl_draw_point (newpos, 1);
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}
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static void thing_move (uint8_t this)
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{
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uint8_t i;
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uint8_t distsq;
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uint8_t panic;
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tinygl_point_t pos;
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tinygl_draw_point (things[this].pos, 0);
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distsq = thing_distance_squared (things, this);
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pos = things[this].pos;
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if (thing_distance_squared (things, this) <= SAFE_DISTANCE * SAFE_DISTANCE)
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things[this].anxiety++;
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else
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things[this].anxiety = 0;
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panic = things[this].anxiety > ANXIETY_LEVEL
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&& (rand () % 100 > (100 - PANIC_LEVEL));
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for (i = 0; i < MOVE_ATTEMPTS; i++)
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{
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int8_t dx;
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int8_t dy;
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tinygl_point_t newpos;
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dx = (rand () % 3) - 1;
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dy = (rand () % 3) - 1;
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newpos = tinygl_point (pos.x + dx, pos.y + dy);
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if ((dx || dy) && ! thing_position_valid_p (newpos))
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continue;
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things[this].pos = newpos;
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if (panic || thing_distance_squared (things, this) > distsq)
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break;
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}
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/* Stay put if cannot find better position. */
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if (i == MOVE_ATTEMPTS)
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things[this].pos = pos;
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tinygl_draw_point (things[this].pos, 1);
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}
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void things_move (void)
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{
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uint8_t i;
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for (i = 1; i < THINGS_NUM; i++)
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if (things[i].alive)
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thing_move (i);
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}
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void things_create (void)
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{
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uint8_t i;
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things[0].pos.x = 0;
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things[0].pos.y = 0;
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things[0].alive = 1;
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tinygl_draw_point (things[0].pos, 1);
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for (i = 1; i < THINGS_NUM; i++)
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{
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uint8_t x;
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uint8_t y;
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do
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{
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x = rand () % TINYGL_WIDTH;
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y = rand () % TINYGL_HEIGHT;
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} while (thing_find (tinygl_point (x, y)) != -1);
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things[i].pos.x = x;
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things[i].pos.y = y;
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things[i].alive = 1;
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tinygl_draw_point (things[i].pos, 1);
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}
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}
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@ -0,0 +1,18 @@
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#ifndef THINGS_H
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#define THINGS_H
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#include "system.h"
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void things_create (void);
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void things_twinkle (void);
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void things_display (uint8_t tick);
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bool things_killed_p (void);
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void monster_move (int8_t dx, int8_t dy);
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void things_move (void);
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#endif
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