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libcaca
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libcaca/test/demo.c

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  1. /*

  2.  *  demo          demo for libcaca

  3.  *  Copyright (c) 2003 Sam Hocevar <sam@zoy.org>

  4.  *                All Rights Reserved

  5.  *

  6.  *  $Id$

  7.  *

  8.  *  This program is free software; you can redistribute it and/or

  9.  *  modify it under the terms of the Do What The Fuck You Want To

  10.  *  Public License, Version 2, as published by Sam Hocevar. See

  11.  *  http://sam.zoy.org/wtfpl/COPYING for more details.

  12.  */

  13. 

  14. #include "config.h"

  15. 

  16. #include <math.h>

  17. #include <string.h>

  18. #include <stdio.h>

  19. 

  20. #include "caca.h"

  21. 

  22. static void display_menu(void);

  23. 

  24. static void demo_all(void);

  25. 

  26. static void demo_color(void);

  27. static void demo_dots(void);

  28. static void demo_lines(void);

  29. static void demo_boxes(void);

  30. static void demo_ellipses(void);

  31. static void demo_triangles(void);

  32. static void demo_sprites(void);

  33. static void demo_render(void);

  34. 

  35. int bounds = 0;

  36. int outline = 0;

  37. int dithering = 0;

  38. struct cucul_sprite *sprite = NULL;

  39. 

  40. cucul_t *qq;

  41. caca_t *kk;

  42. 

  43. int main(int argc, char **argv)

  44. {

  45.     void (*demo)(void) = NULL;

  46.     int quit = 0;

  47. 

  48.     qq = cucul_init();

  49.     if(!qq)

  50.         return 1;

  51.     kk = caca_attach(qq);

  52.     if(!kk)

  53.         return 1;

  54. 

  55.     caca_set_delay(kk, 40000);

  56. 

  57.     /* Initialize data */

  58.     sprite = cucul_load_sprite(qq, DATADIR "/caca.txt");

  59.     if(!sprite)

  60.         sprite = cucul_load_sprite(qq, "caca.txt");

  61.     if(!sprite)

  62.         sprite = cucul_load_sprite(qq, "examples/caca.txt");

  63. 

  64.     /* Main menu */

  65.     display_menu();

  66.     caca_display(kk);

  67. 

  68.     /* Go ! */

  69.     while(!quit)

  70.     {

  71.         int menu = 0, mouse = 0, xmouse = 0, ymouse = 0;

  72.         int event;

  73. 

  74.         while((event = caca_get_event(kk, CACA_EVENT_ANY)))

  75.         {

  76.             if(demo && (event & CACA_EVENT_KEY_PRESS))

  77.             {

  78.                 menu = 1;

  79.                 demo = NULL;

  80.             }

  81.             else if(event & CACA_EVENT_KEY_PRESS)

  82.             {

  83.                 switch(event & 0xffff)

  84.                 {

  85.                 case 'q':

  86.                 case 'Q':

  87.                     demo = NULL;

  88.                     quit = 1;

  89.                     break;

  90.                 case 'o':

  91.                 case 'O':

  92.                     outline = (outline + 1) % 3;

  93.                     display_menu();

  94.                     break;

  95.                 case 'b':

  96.                 case 'B':

  97.                     bounds = (bounds + 1) % 2;

  98.                     display_menu();

  99.                     break;

  100.                 case 'd':

  101.                 case 'D':

  102.                     dithering = (dithering + 1) % 5;

  103.                     cucul_set_feature(qq, dithering);

  104.                     display_menu();

  105.                     break;

  106.                 case 'c':

  107.                     demo = demo_color;

  108.                     break;

  109.                 case 'f':

  110.                 case 'F':

  111.                     demo = demo_all;

  112.                     break;

  113.                 case '1':

  114.                     demo = demo_dots;

  115.                     break;

  116.                 case '2':

  117.                     demo = demo_lines;

  118.                     break;

  119.                 case '3':

  120.                     demo = demo_boxes;

  121.                     break;

  122.                 case '4':

  123.                     demo = demo_triangles;

  124.                     break;

  125.                 case '5':

  126.                     demo = demo_ellipses;

  127.                     break;

  128.                 case 's':

  129.                 case 'S':

  130.                     if(sprite)

  131.                         demo = demo_sprites;

  132.                     break;

  133.                 case 'r':

  134.                 case 'R':

  135.                     demo = demo_render;

  136.                     break;

  137.                 }

  138. 

  139.                 if(demo)

  140.                     cucul_clear(qq);

  141.             }

  142.             else if(event & CACA_EVENT_MOUSE_MOTION)

  143.             {

  144.                 mouse = 1;

  145.                 xmouse = (event & 0xfff000) >> 12;

  146.                 ymouse = event & 0xfff;

  147.             }

  148.         }

  149. 

  150.         if(menu || (mouse && !demo))

  151.         {

  152.             display_menu();

  153.             if(mouse && !demo)

  154.             {

  155.                 cucul_set_color(qq, CUCUL_COLOR_RED, CUCUL_COLOR_BLACK);

  156.                 cucul_putstr(qq, xmouse, ymouse, "|\\");

  157.             }

  158.             caca_display(kk);

  159.             mouse = menu = 0;

  160.         }

  161. 

  162.         if(demo)

  163.         {

  164.             demo();

  165. 

  166.             cucul_set_color(qq, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  167.             cucul_draw_thin_box(qq, 1, 1, cucul_get_width(qq) - 2, cucul_get_height(qq) - 2);

  168.             cucul_printf(qq, 4, 1, "[%i.%i fps]----",

  169.                          1000000 / caca_get_rendertime(kk),

  170.                          (10000000 / caca_get_rendertime(kk)) % 10);

  171.             caca_display(kk);

  172.         }

  173.     }

  174. 

  175.     /* Clean up */

  176.     cucul_free_sprite(qq, sprite);

  177.     caca_detach(kk);

  178.     cucul_end(qq);

  179. 

  180.     return 0;

  181. }

  182. 

  183. static void display_menu(void)

  184. {

  185.     int xo = cucul_get_width(qq) - 2;

  186.     int yo = cucul_get_height(qq) - 2;

  187. 

  188.     cucul_clear(qq);

  189.     cucul_set_color(qq, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  190.     cucul_draw_thin_box(qq, 1, 1, xo, yo);

  191. 

  192.     cucul_putstr(qq, (xo - strlen("libcaca demo")) / 2, 3, "libcaca demo");

  193.     cucul_putstr(qq, (xo - strlen("==============")) / 2, 4, "==============");

  194. 

  195.     cucul_putstr(qq, 4, 6, "demos:");

  196.     cucul_putstr(qq, 4, 7, "'f': full");

  197.     cucul_putstr(qq, 4, 8, "'1': dots");

  198.     cucul_putstr(qq, 4, 9, "'2': lines");

  199.     cucul_putstr(qq, 4, 10, "'3': boxes");

  200.     cucul_putstr(qq, 4, 11, "'4': triangles");

  201.     cucul_putstr(qq, 4, 12, "'5': ellipses");

  202.     cucul_putstr(qq, 4, 13, "'c': colour");

  203.     cucul_putstr(qq, 4, 14, "'r': render");

  204.     if(sprite)

  205.         cucul_putstr(qq, 4, 15, "'s': sprites");

  206. 

  207.     cucul_putstr(qq, 4, 16, "settings:");

  208.     cucul_printf(qq, 4, 17, "'o': outline: %s",

  209.                  outline == 0 ? "none" : outline == 1 ? "solid" : "thin");

  210.     cucul_printf(qq, 4, 18, "'b': drawing boundaries: %s",

  211.                  bounds == 0 ? "screen" : "infinite");

  212.     cucul_printf(qq, 4, 19, "'d': dithering (%s)",

  213.                  cucul_get_feature_name(dithering));

  214. 

  215.     cucul_putstr(qq, 4, yo - 2, "'q': quit");

  216. 

  217.     caca_display(kk);

  218. }

  219. 

  220. static void demo_all(void)

  221. {

  222.     static int i = 0;

  223. 

  224.     int j, xo, yo, xa, ya, xb, yb, xc, yc;

  225. 

  226.     i++;

  227. 

  228.     cucul_clear(qq);

  229. 

  230.     /* Draw the sun */

  231.     cucul_set_color(qq, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  232.     xo = cucul_get_width(qq) / 4;

  233.     yo = cucul_get_height(qq) / 4 + 5 * sin(0.03*i);

  234. 

  235.     for(j = 0; j < 16; j++)

  236.     {

  237.         xa = xo - (30 + sin(0.03*i) * 8) * sin(0.03*i + M_PI*j/8);

  238.         ya = yo + (15 + sin(0.03*i) * 4) * cos(0.03*i + M_PI*j/8);

  239.         cucul_draw_thin_line(qq, xo, yo, xa, ya);

  240.     }

  241. 

  242.     j = 15 + sin(0.03*i) * 8;

  243.     cucul_set_color(qq, CUCUL_COLOR_WHITE, CUCUL_COLOR_BLACK);

  244.     cucul_fill_ellipse(qq, xo, yo, j, j / 2, '#');

  245.     cucul_set_color(qq, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  246.     cucul_draw_ellipse(qq, xo, yo, j, j / 2, '#');

  247. 

  248.     /* Draw the pyramid */

  249.     xo = cucul_get_width(qq) * 5 / 8;

  250.     yo = 2;

  251. 

  252.     xa = cucul_get_width(qq) / 8 + sin(0.03*i) * 5;

  253.     ya = cucul_get_height(qq) / 2 + cos(0.03*i) * 5;

  254. 

  255.     xb = cucul_get_width(qq) - 10 - cos(0.02*i) * 10;

  256.     yb = cucul_get_height(qq) * 3 / 4 - 5 + sin(0.02*i) * 5;

  257. 

  258.     xc = cucul_get_width(qq) / 4 - sin(0.02*i) * 5;

  259.     yc = cucul_get_height(qq) * 3 / 4 + cos(0.02*i) * 5;

  260. 

  261.     cucul_set_color(qq, CUCUL_COLOR_GREEN, CUCUL_COLOR_BLACK);

  262.     cucul_fill_triangle(qq, xo, yo, xb, yb, xa, ya, '%');

  263.     cucul_set_color(qq, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  264.     cucul_draw_thin_triangle(qq, xo, yo, xb, yb, xa, ya);

  265. 

  266.     cucul_set_color(qq, CUCUL_COLOR_RED, CUCUL_COLOR_BLACK);

  267.     cucul_fill_triangle(qq, xa, ya, xb, yb, xc, yc, '#');

  268.     cucul_set_color(qq, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  269.     cucul_draw_thin_triangle(qq, xa, ya, xb, yb, xc, yc);

  270. 

  271.     cucul_set_color(qq, CUCUL_COLOR_BLUE, CUCUL_COLOR_BLACK);

  272.     cucul_fill_triangle(qq, xo, yo, xb, yb, xc, yc, '%');

  273.     cucul_set_color(qq, CUCUL_COLOR_YELLOW, CUCUL_COLOR_BLACK);

  274.     cucul_draw_thin_triangle(qq, xo, yo, xb, yb, xc, yc);

  275. 

  276.     /* Draw a background triangle */

  277.     xa = 2;

  278.     ya = 2;

  279. 

  280.     xb = cucul_get_width(qq) - 3;

  281.     yb = cucul_get_height(qq) / 2;

  282. 

  283.     xc = cucul_get_width(qq) / 3;

  284.     yc = cucul_get_height(qq) - 3;

  285. 

  286.     cucul_set_color(qq, CUCUL_COLOR_CYAN, CUCUL_COLOR_BLACK);

  287.     cucul_draw_thin_triangle(qq, xa, ya, xb, yb, xc, yc);

  288. 

  289.     xo = cucul_get_width(qq) / 2 + cos(0.027*i) * cucul_get_width(qq) / 3;

  290.     yo = cucul_get_height(qq) / 2 - sin(0.027*i) * cucul_get_height(qq) / 2;

  291. 

  292.     cucul_draw_thin_line(qq, xa, ya, xo, yo);

  293.     cucul_draw_thin_line(qq, xb, yb, xo, yo);

  294.     cucul_draw_thin_line(qq, xc, yc, xo, yo);

  295. 

  296.     /* Draw a sprite on the pyramid */

  297.     cucul_draw_sprite(qq, xo, yo, sprite, 0);

  298. 

  299.     /* Draw a trail behind the foreground sprite */

  300.     for(j = i - 60; j < i; j++)

  301.     {

  302.         int delta = cucul_rand(-5, 5);

  303.         cucul_set_color(qq, cucul_rand(0, 15), cucul_rand(0, 15));

  304.         cucul_putchar(qq, cucul_get_width(qq) / 2

  305.                     + cos(0.02*j) * (delta + cucul_get_width(qq) / 4),

  306.                    cucul_get_height(qq) / 2

  307.                     + sin(0.02*j) * (delta + cucul_get_height(qq) / 3),

  308.                    '#');

  309.     }

  310. 

  311.     /* Draw foreground sprite */

  312.     cucul_draw_sprite(qq, cucul_get_width(qq) / 2 + cos(0.02*i) * cucul_get_width(qq) / 4,

  313.                    cucul_get_height(qq) / 2 + sin(0.02*i) * cucul_get_height(qq) / 3,

  314.                    sprite, 0);

  315. }

  316. 

  317. static void demo_dots(void)

  318. {

  319.     int xmax = cucul_get_width(qq) - 1;

  320.     int ymax = cucul_get_height(qq) - 1;

  321.     int i;

  322.     static char chars[10] =

  323.     {

  324.         '+', '-', '*', '#', 'X', '@', '%', '$', 'M', 'W'

  325.     };

  326. 

  327.     for(i = 1000; i--;)

  328.     {

  329.         /* Putpixel */

  330.         cucul_set_color(qq, cucul_rand(0, 15), cucul_rand(0, 15));

  331.         cucul_putchar(qq, cucul_rand(0, xmax), cucul_rand(0, ymax),

  332.                       chars[cucul_rand(0, 9)]);

  333.     }

  334. }

  335. 

  336. static void demo_color(void)

  337. {

  338.     int i, j;

  339.     char buf[BUFSIZ];

  340. 

  341.     cucul_clear(qq);

  342.     for(i = 0; i < 16; i++)

  343.     {

  344.         sprintf(buf, "'%c': %i (%s)", 'a' + i, i, cucul_get_color_name(i));

  345.         cucul_set_color(qq, CUCUL_COLOR_LIGHTGRAY, CUCUL_COLOR_BLACK);

  346.         cucul_putstr(qq, 4, i + (i >= 8 ? 4 : 3), buf);

  347.         for(j = 0; j < 16; j++)

  348.         {

  349.             cucul_set_color(qq, i, j);

  350.             cucul_putstr(qq, (j >= 8 ? 41 : 40) + j * 2, i + (i >= 8 ? 4 : 3), "# ");

  351.         }

  352.     }

  353. }

  354. 

  355. static void demo_lines(void)

  356. {

  357.     int w = cucul_get_width(qq);

  358.     int h = cucul_get_height(qq);

  359.     int xa, ya, xb, yb;

  360. 

  361.     if(bounds)

  362.     {

  363.         xa = cucul_rand(- w, 2 * w); ya = cucul_rand(- h, 2 * h);

  364.         xb = cucul_rand(- w, 2 * w); yb = cucul_rand(- h, 2 * h);

  365.     }

  366.     else

  367.     {

  368.         xa = cucul_rand(0, w - 1); ya = cucul_rand(0, h - 1);

  369.         xb = cucul_rand(0, w - 1); yb = cucul_rand(0, h - 1);

  370.     }

  371. 

  372.     cucul_set_color(qq, cucul_rand(0, 15), CUCUL_COLOR_BLACK);

  373.     if(outline > 1)

  374.         cucul_draw_thin_line(qq, xa, ya, xb, yb);

  375.     else

  376.         cucul_draw_line(qq, xa, ya, xb, yb, '#');

  377. }

  378. 

  379. static void demo_boxes(void)

  380. {

  381.     int w = cucul_get_width(qq);

  382.     int h = cucul_get_height(qq);

  383.     int xa, ya, xb, yb;

  384. 

  385.     if(bounds)

  386.     {

  387.         xa = cucul_rand(- w, 2 * w); ya = cucul_rand(- h, 2 * h);

  388.         xb = cucul_rand(- w, 2 * w); yb = cucul_rand(- h, 2 * h);

  389.     }

  390.     else

  391.     {

  392.         xa = cucul_rand(0, w - 1); ya = cucul_rand(0, h - 1);

  393.         xb = cucul_rand(0, w - 1); yb = cucul_rand(0, h - 1);

  394.     }

  395. 

  396.     cucul_set_color(qq, cucul_rand(0, 15), cucul_rand(0, 15));

  397.     cucul_fill_box(qq, xa, ya, xb, yb, '#');

  398. 

  399.     cucul_set_color(qq, cucul_rand(0, 15), CUCUL_COLOR_BLACK);

  400.     if(outline == 2)

  401.         cucul_draw_thin_box(qq, xa, ya, xb, yb);

  402.     else if(outline == 1)

  403.         cucul_draw_box(qq, xa, ya, xb, yb, '#');

  404. }

  405. 

  406. static void demo_ellipses(void)

  407. {

  408.     int w = cucul_get_width(qq);

  409.     int h = cucul_get_height(qq);

  410.     int x, y, a, b;

  411. 

  412.     if(bounds)

  413.     {

  414.         x = cucul_rand(- w, 2 * w); y = cucul_rand(- h, 2 * h);

  415.         a = cucul_rand(0, w); b = cucul_rand(0, h);

  416.     }

  417.     else

  418.     {

  419.         do

  420.         {

  421.             x = cucul_rand(0, w); y = cucul_rand(0, h);

  422.             a = cucul_rand(0, w); b = cucul_rand(0, h);

  423. 

  424.         } while(x - a < 0 || x + a >= w || y - b < 0 || y + b >= h);

  425.     }

  426. 

  427.     cucul_set_color(qq, cucul_rand(0, 15), cucul_rand(0, 15));

  428.     cucul_fill_ellipse(qq, x, y, a, b, '#');

  429. 

  430.     cucul_set_color(qq, cucul_rand(0, 15), CUCUL_COLOR_BLACK);

  431.     if(outline == 2)

  432.         cucul_draw_thin_ellipse(qq, x, y, a, b);

  433.     else if(outline == 1)

  434.         cucul_draw_ellipse(qq, x, y, a, b, '#');

  435. }

  436. 

  437. static void demo_triangles(void)

  438. {

  439.     int w = cucul_get_width(qq);

  440.     int h = cucul_get_height(qq);

  441.     int xa, ya, xb, yb, xc, yc;

  442. 

  443.     if(bounds)

  444.     {

  445.         xa = cucul_rand(- w, 2 * w); ya = cucul_rand(- h, 2 * h);

  446.         xb = cucul_rand(- w, 2 * w); yb = cucul_rand(- h, 2 * h);

  447.         xc = cucul_rand(- w, 2 * w); yc = cucul_rand(- h, 2 * h);

  448.     }

  449.     else

  450.     {

  451. 

  452.         xa = cucul_rand(0, w - 1); ya = cucul_rand(0, h - 1);

  453.         xb = cucul_rand(0, w - 1); yb = cucul_rand(0, h - 1);

  454.         xc = cucul_rand(0, w - 1); yc = cucul_rand(0, h - 1);

  455.     }

  456. 

  457.     cucul_set_color(qq, cucul_rand(0, 15), cucul_rand(0, 15));

  458.     cucul_fill_triangle(qq, xa, ya, xb, yb, xc, yc, '#');

  459. 

  460.     cucul_set_color(qq, cucul_rand(0, 15), CUCUL_COLOR_BLACK);

  461.     if(outline == 2)

  462.         cucul_draw_thin_triangle(qq, xa, ya, xb, yb, xc, yc);

  463.     else if(outline == 1)

  464.         cucul_draw_triangle(qq, xa, ya, xb, yb, xc, yc, '#');

  465. }

  466. 

  467. static void demo_sprites(void)

  468. {

  469.     cucul_draw_sprite(qq, cucul_rand(0, cucul_get_width(qq) - 1),

  470.                    cucul_rand(0, cucul_get_height(qq) - 1), sprite, 0);

  471. }

  472. 

  473. #if 0

  474. static void demo_render(void)

  475. {

  476.     struct cucul_bitmap *bitmap;

  477.     //short buffer[256*256];

  478.     //short *dest = buffer;

  479.     int buffer[256*256];

  480.     int *dest = buffer;

  481.     int x, y, z;

  482.     static int i = 0;

  483. 

  484.     i = (i + 1) % 512;

  485.     z = i < 256 ? i : 511 - i;

  486. 

  487.     for(x = 0; x < 256; x++)

  488.         for(y = 0; y < 256; y++)

  489.     {

  490.         //*dest++ = ((x >> 3) << 11) | ((y >> 2) << 5) | ((z >> 3));

  491.         *dest++ = (x << 16) | (y << 8) | (z);

  492.     }

  493. 

  494.     //bitmap = cucul_create_bitmap(16, 256, 256, 2 * 256, 0xf800, 0x07e0, 0x001f, 0x0000);

  495.     bitmap = cucul_create_bitmap(32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);

  496.     cucul_draw_bitmap(qq, 0, 0, cucul_get_width(qq) - 1, cucul_get_height(qq) - 1,

  497.                      bitmap, buffer);

  498.     cucul_free_bitmap(qq, bitmap);

  499. }

  500. #endif

  501. 

  502. static void draw_circle(int *buffer, int xo, int yo, int r, int mask, int val);

  503. 

  504. static void demo_render(void)

  505. {

  506.     struct cucul_bitmap *bitmap;

  507.     int buffer[256*256];

  508.     int *dest;

  509.     int x, y, z, xo, yo;

  510.     static int i = 0;

  511. 

  512.     i++;

  513. 

  514.     dest = buffer;

  515.     for(x = 0; x < 256; x++)

  516.         for(y = 0; y < 256; y++)

  517.     {

  518.         *dest++ = 0xff000000;

  519.     }

  520. 

  521.     /* red */

  522.     xo = 128 + 48 * sin(0.02 * i);

  523.     yo = 128 + 48 * cos(0.03 * i);

  524.     for(z = 0; z < 240; z++)

  525.         draw_circle(buffer, xo, yo, z, 0x00ff0000, 200 << 16);

  526. 

  527.     /* green */

  528.     xo = 128 + 48 * sin(2 + 0.06 * i);

  529.     yo = 128 + 48 * cos(2 + 0.05 * i);

  530.     for(z = 0; z < 240; z++)

  531.         draw_circle(buffer, xo, yo, z, 0x0000ff00, 200 << 8);

  532. 

  533.     /* blue */

  534.     xo = 128 + 48 * sin(1 + 0.04 * i);

  535.     yo = 128 + 48 * cos(1 + 0.03 * i);

  536.     for(z = 0; z < 240; z++)

  537.         draw_circle(buffer, xo, yo, z, 0x000000ff, 200);

  538. 

  539.     bitmap = cucul_create_bitmap(qq, 32, 256, 256, 4 * 256, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000);

  540.     cucul_draw_bitmap(qq, 0, 0, cucul_get_width(qq) - 1, cucul_get_height(qq) - 1, bitmap, (char *)buffer);

  541.     cucul_free_bitmap(qq, bitmap);

  542. }

  543. 

  544. static void draw_circle(int *buffer, int x, int y, int r, int mask, int val)

  545. {

  546.     int t, dx, dy;

  547. 

  548. #define POINT(X,Y) \

  549.     buffer[(X) + 256 * (Y)] = 0xff000000 | (buffer[(X) + 256 * (Y)] & ~mask) | val;

  550. 

  551.     for(t = 0, dx = 0, dy = r; dx <= dy; dx++)

  552.     {

  553.         POINT(x - dx / 3, y - dy / 3);

  554.         POINT(x + dx / 3, y - dy / 3);

  555.         POINT(x - dx / 3, y + dy / 3);

  556.         POINT(x + dx / 3, y + dy / 3);

  557. 

  558.         POINT(x - dy / 3, y - dx / 3);

  559.         POINT(x + dy / 3, y - dx / 3);

  560.         POINT(x - dy / 3, y + dx / 3);

  561.         POINT(x + dy / 3, y + dx / 3);

  562. 

  563.         t += t > 0 ? dx - dy-- : dx;

  564.     }

  565. }