borgware-2d/animations/ltn_ant.c

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/* Copyright (c) 2010 Jan Lieven
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#include "../config.h"
#include "../pixel.h"
#include "../util.h"
#include "../random/prng.h"
void ltn_ant() {
clear_screen(0);
struct {
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char x , y;
char dx, dy; /* Vector can only be: (0,1),(1,0),(0,-1),(-1,0) */
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char ox, oy; /* Used to set old pixels so brightness 2 */
} ant;
char temp, i = 0, refill = 0;
uint16_t cycles = 500;
/* Random startposition and direction */
ant.x = random8() % NUM_COLS;
ant.y = random8() % NUM_ROWS;
/* Make sure we do have a valid vector */
do {
ant.dx = (random8() % 3) - 1;
ant.dy = (random8() % 3) - 1;
} while(ant.dx == ant.dy);
while(cycles != 0) {
if(get_pixel((pixel) {ant.x, ant.y}) == 0) { /* If the pixel is not set turn it on */
setpixel((pixel) {ant.x, ant.y}, 3);
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temp = ant.dx;
ant.dx = ant.dy;
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ant.dy = -temp; /* Turn 90 degrees to the right */
/* Lets the last pixel be darker than the latest */
if(i == 1)
setpixel((pixel) {ant.ox, ant.oy}, 2);
else
i = 1;
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ant.ox = ant.x;
ant.oy = ant.y;
} else {
setpixel((pixel) {ant.x, ant.y}, 0);
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temp = ant.dy;
ant.dy = ant.dx;
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ant.dx = -temp; /* Turn 90 degrees to the left */
}
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wait(100);
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ant.x += ant.dx;
ant.y += ant.dy;
/* The ant will appear on the oppisite side of the field if it would leave */
if(ant.x <= 0)
ant.x += (NUM_ROWS - 1);
if(ant.x >= NUM_ROWS)
ant.x -= (NUM_ROWS + 1);
if(ant.y <= 0)
ant.y += (NUM_COLS - 1);
if(ant.y >= NUM_COLS)
ant.y -= (NUM_COLS + 1);
cycles--;
}
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wait(300);
}