/* ppmpat.c - make a pixmap
**
** Copyright (C) 1989, 1991 by Jef Poskanzer.
**
** Permission to use, copy, modify, and distribute this software and its
** documentation for any purpose and without fee is hereby granted, provided
** that the above copyright notice appear in all copies and that both that
** copyright notice and this permission notice appear in supporting
** documentation. This software is provided "as is" without express or
** implied warranty.
*/
#define _XOPEN_SOURCE /* get M_PI in math.h */
#include <assert.h>
#include <math.h>
#include <limits.h>
#include "pm_c_util.h"
#include "mallocvar.h"
#include "shhopt.h"
#include "ppm.h"
#include "ppmdraw.h"
typedef enum {
PAT_GINGHAM2,
PAT_GINGHAM3,
PAT_MADRAS,
PAT_TARTAN,
PAT_POLES,
PAT_SQUIG,
PAT_CAMO,
PAT_ANTICAMO
} pattern;
struct cmdlineInfo {
/* All the information the user supplied in the command line,
in a form easy for the program to use.
*/
pattern basePattern;
unsigned int width;
unsigned int height;
};
static void
parseCommandLine(int argc, const char ** argv,
struct cmdlineInfo * const cmdlineP) {
/*----------------------------------------------------------------------------
Note that the file spec array we return is stored in the storage that
was passed to us as the argv array.
-----------------------------------------------------------------------------*/
optEntry * option_def;
/* Instructions to OptParseOptions3 on how to parse our options.
*/
optStruct3 opt;
unsigned int option_def_index;
unsigned int basePatternCount;
unsigned int gingham2;
unsigned int gingham3;
unsigned int madras;
unsigned int tartan;
unsigned int poles;
unsigned int squig;
unsigned int camo;
unsigned int anticamo;
MALLOCARRAY_NOFAIL(option_def, 100);
option_def_index = 0; /* incremented by OPTENTRY */
OPTENT3(0, "gingham2", OPT_FLAG, NULL, &gingham2, 0);
OPTENT3(0, "g2", OPT_FLAG, NULL, &gingham2, 0);
OPTENT3(0, "gingham3", OPT_FLAG, NULL, &gingham3, 0);
OPTENT3(0, "g3", OPT_FLAG, NULL, &gingham3, 0);
OPTENT3(0, "madras", OPT_FLAG, NULL, &madras, 0);
OPTENT3(0, "tartan", OPT_FLAG, NULL, &tartan, 0);
OPTENT3(0, "poles", OPT_FLAG, NULL, &poles, 0);
OPTENT3(0, "squig", OPT_FLAG, NULL, &squig, 0);
OPTENT3(0, "camo", OPT_FLAG, NULL, &camo, 0);
OPTENT3(0, "anticamo", OPT_FLAG, NULL, &anticamo, 0);
opt.opt_table = option_def;
opt.short_allowed = FALSE; /* We have no short (old-fashioned) options */
opt.allowNegNum = FALSE; /* We have no parms that are negative numbers */
pm_optParseOptions3(&argc, (char **)argv, opt, sizeof(opt), 0);
/* Uses and sets argc, argv, and some of *cmdlineP and others. */
basePatternCount =
gingham2 +
gingham3 +
madras +
tartan +
poles +
squig +
camo +
anticamo;
if (basePatternCount < 1)
pm_error("You must specify a base pattern option such as -gingham2");
else if (basePatternCount > 1)
pm_error("You may not specify more than one base pattern option. "
"You specified %u", basePatternCount);
else {
if (gingham2)
cmdlineP->basePattern = PAT_GINGHAM2;
else if (gingham3)
cmdlineP->basePattern = PAT_GINGHAM3;
else if (madras)
cmdlineP->basePattern = PAT_MADRAS;
else if (tartan)
cmdlineP->basePattern = PAT_TARTAN;
else if (poles)
cmdlineP->basePattern = PAT_POLES;
else if (squig)
cmdlineP->basePattern = PAT_SQUIG;
else if (camo)
cmdlineP->basePattern = PAT_CAMO;
else if (anticamo)
cmdlineP->basePattern = PAT_ANTICAMO;
else
assert(false); /* Every possibility is accounted for */
}
if (argc-1 != 2)
pm_error("You must specify 2 non-option arguments: width and height "
"in pixels. You specified %u", argc-1);
else {
cmdlineP->width = atoi(argv[1]);
cmdlineP->height = atoi(argv[2]);
if (cmdlineP->width < 1)
pm_error("Width must be at least 1 pixel");
if (cmdlineP->height < 1)
pm_error("Height must be at least 1 pixel");
}
}
static void
validateComputableDimensions(unsigned int const cols,
unsigned int const rows) {
/*
Notes on width and height limits:
cols * 3, rows * 3 appear in madras, tartan
cols*rows appears in poles
cols+rows appears in squig
PPMD functions use signed integers for pixel positions
(because they allow you to specify points off the canvas).
*/
if (cols > INT_MAX/4 || rows > INT_MAX/4 || rows > INT_MAX/cols)
pm_error("Width and/or height are way too large: %u x %u",
cols, rows);
}
static pixel
randomColor(pixval const maxval) {
pixel p;
PPM_ASSIGN(p,
rand() % (maxval + 1),
rand() % (maxval + 1),
rand() % (maxval + 1)
);
return p;
}
#define DARK_THRESH 0.25
static pixel
randomBrightColor(pixval const maxval) {
pixel p;
do {
p = randomColor(maxval);
} while (PPM_LUMIN(p) <= maxval * DARK_THRESH);
return p;
}
static pixel
randomDarkColor(pixval const maxval) {
pixel p;
do {
p = randomColor(maxval);
} while (PPM_LUMIN(p) > maxval * DARK_THRESH);
return p;
}
static pixel
averageTwoColors(pixel const p1,
pixel const p2) {
pixel p;
PPM_ASSIGN(p,
(PPM_GETR(p1) + PPM_GETR(p2)) / 2,
(PPM_GETG(p1) + PPM_GETG(p2)) / 2,
(PPM_GETB(p1) + PPM_GETB(p2)) / 2);
return p;
}
static ppmd_drawproc average_drawproc;
static void
average_drawproc(pixel ** const pixels,
int const cols,
int const rows,
pixval const maxval,
int const col,
int const row,
const void * const clientdata) {
if (col >= 0 && col < cols && row >= 0 && row < rows)
pixels[row][col] =
averageTwoColors(pixels[row][col], *((const pixel*) clientdata));
}
/*----------------------------------------------------------------------------
Camouflage stuff
-----------------------------------------------------------------------------*/
static pixel
randomAnticamoColor(pixval const maxval) {
int v1, v2, v3;
pixel p;
v1 = (maxval + 1) / 4;
v2 = (maxval + 1) / 2;
v3 = 3 * v1;
switch (rand() % 15) {
case 0: case 1:
PPM_ASSIGN(p, rand() % v1 + v3, rand() % v2, rand() % v2);
break;
case 2:
case 3:
PPM_ASSIGN(p, rand() % v2, rand() % v1 + v3, rand() % v2);
break;
case 4:
case 5:
PPM_ASSIGN(p, rand() % v2, rand() % v2, rand() % v1 + v3);
break;
case 6:
case 7:
case 8:
PPM_ASSIGN(p, rand() % v2, rand() % v1 + v3, rand() % v1 + v3);
break;
case 9:
case 10:
case 11:
PPM_ASSIGN(p, rand() % v1 + v3, rand() % v2, rand() % v1 + v3);
break;
case 12:
case 13:
case 14:
PPM_ASSIGN(p, rand() % v1 + v3, rand() % v1 + v3, rand() % v2);
break;
}
return p;
}
static pixel
randomCamoColor(pixval const maxval) {
int const v1 = (maxval + 1 ) / 8;
int const v2 = (maxval + 1 ) / 4;
int const v3 = (maxval + 1 ) / 2;
pixel p;
switch (rand() % 10) {
case 0:
case 1:
case 2:
/* light brown */
PPM_ASSIGN(p, rand() % v3 + v3, rand() % v3 + v2, rand() % v3 + v2);
break;
case 3:
case 4:
case 5:
/* dark green */
PPM_ASSIGN(p, rand() % v2, rand() % v2 + 3 * v1, rand() % v2);
break;
case 6:
case 7:
/* brown */
PPM_ASSIGN(p, rand() % v2 + v2, rand() % v2, rand() % v2);
break;
case 8:
case 9:
/* dark brown */
PPM_ASSIGN(p, rand() % v1 + v1, rand() % v1, rand() % v1);
break;
}
return p;
}
static float
rnduni(void) {
return rand() % 32767 / 32767.0;
}
static void
clearBackground(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval,
bool const antiflag) {
pixel color;
if (antiflag)
color = randomAnticamoColor(maxval);
else
color = randomCamoColor(maxval);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols, rows, PPMD_NULLDRAWPROC,
&color);
}
static void
camoFill(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval,
struct fillobj * const fh,
bool const antiflag) {
pixel color;
if (antiflag)
color = randomAnticamoColor(maxval);
else
color = randomCamoColor(maxval);
ppmd_fill(pixels, cols, rows, maxval, fh, PPMD_NULLDRAWPROC, &color);
}
#define BLOBRAD 50
#define MIN_POINTS 7
#define MAX_POINTS 13
#define MIN_ELLIPSE_FACTOR 0.5
#define MAX_ELLIPSE_FACTOR 2.0
#define MIN_POINT_FACTOR 0.5
#define MAX_POINT_FACTOR 2.0
static void
computeXsYs(int * const xs,
int * const ys,
unsigned int const cols,
unsigned int const rows,
unsigned int const pointCt) {
unsigned int const cx = rand() % cols;
unsigned int const cy = rand() % rows;
double const a = rnduni() * (MAX_ELLIPSE_FACTOR - MIN_ELLIPSE_FACTOR) +
MIN_ELLIPSE_FACTOR;
double const b = rnduni() * (MAX_ELLIPSE_FACTOR - MIN_ELLIPSE_FACTOR) +
MIN_ELLIPSE_FACTOR;
double const theta = rnduni() * 2.0 * M_PI;
unsigned int p;
for (p = 0; p < pointCt; ++p) {
double const c = rnduni() * (MAX_POINT_FACTOR - MIN_POINT_FACTOR) +
MIN_POINT_FACTOR;
double const tx = a * sin(p * 2.0 * M_PI / pointCt);
double const ty = b * cos(p * 2.0 * M_PI / pointCt);
double const tang = atan2(ty, tx) + theta;
xs[p] = MAX(0, MIN(cols-1, cx + BLOBRAD * c * sin(tang)));
ys[p] = MAX(0, MIN(rows-1, cy + BLOBRAD * c * cos(tang)));
}
}
static void
camo(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval,
bool const antiflag) {
unsigned int const n = (rows * cols) / (BLOBRAD * BLOBRAD) * 5;
unsigned int i;
clearBackground(pixels, cols, rows, maxval, antiflag);
for (i = 0; i < n; ++i) {
unsigned int const pointCt =
rand() % (MAX_POINTS - MIN_POINTS + 1) + MIN_POINTS;
int xs[MAX_POINTS], ys[MAX_POINTS];
int x0, y0;
struct fillobj * fh;
computeXsYs(xs, ys, cols, rows, pointCt);
x0 = (xs[0] + xs[pointCt - 1]) / 2;
y0 = (ys[0] + ys[pointCt - 1]) / 2;
fh = ppmd_fill_create();
ppmd_polyspline(
pixels, cols, rows, maxval, x0, y0, pointCt, xs, ys, x0, y0,
ppmd_fill_drawproc, fh);
camoFill(pixels, cols, rows, maxval, fh, antiflag);
ppmd_fill_destroy(fh);
}
}
/*----------------------------------------------------------------------------
Gingham stuff
-----------------------------------------------------------------------------*/
static void
gingham2(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval) {
pixel const backcolor = randomDarkColor(maxval);
pixel const forecolor = randomBrightColor(maxval);
unsigned int const colso2 = cols / 2;
unsigned int const rowso2 = rows / 2;
/* Warp. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, colso2, rows, PPMD_NULLDRAWPROC,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, colso2, 0, cols - colso2, rows,
PPMD_NULLDRAWPROC, &forecolor);
/* Woof. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols, rowso2, average_drawproc,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rowso2, cols, rows - rowso2,
average_drawproc, &forecolor);
}
static void
gingham3(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval) {
unsigned int const colso4 = cols / 4;
unsigned int const rowso4 = rows / 4;
pixel const backcolor = randomDarkColor(maxval);
pixel const fore1color = randomBrightColor(maxval);
pixel const fore2color = randomBrightColor(maxval);
/* Warp. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, colso4, rows, PPMD_NULLDRAWPROC,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, colso4, 0, colso4, rows, PPMD_NULLDRAWPROC,
&fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 2 * colso4, 0, colso4, rows,
PPMD_NULLDRAWPROC, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 3 * colso4, 0, cols - colso4, rows,
PPMD_NULLDRAWPROC, &fore1color);
/* Woof. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols, rowso4, average_drawproc,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rowso4, cols, rowso4, average_drawproc,
&fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 2 * rowso4, cols, rowso4,
average_drawproc, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 3 * rowso4, cols, rows - rowso4,
average_drawproc, &fore1color);
}
static void
madras(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval) {
unsigned int const cols2 = cols * 2 / 44;
unsigned int const rows2 = rows * 2 / 44;
unsigned int const cols3 = cols * 3 / 44;
unsigned int const rows3 = rows * 3 / 44;
unsigned int const cols12 = cols - 10 * cols2 - 4 * cols3;
unsigned int const rows12 = rows - 10 * rows2 - 4 * rows3;
unsigned int const cols6a = cols12 / 2;
unsigned int const rows6a = rows12 / 2;
unsigned int const cols6b = cols12 - cols6a;
unsigned int const rows6b = rows12 - rows6a;
pixel const backcolor = randomDarkColor(maxval);
pixel const fore1color = randomBrightColor(maxval);
pixel const fore2color = randomBrightColor(maxval);
/* Warp. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols2, rows, PPMD_NULLDRAWPROC,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols2, 0, cols3, rows, PPMD_NULLDRAWPROC,
&fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols2 + cols3, 0, cols2, rows,
PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 2 * cols2 + cols3, 0, cols2, rows,
PPMD_NULLDRAWPROC, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 3 * cols2 + cols3, 0, cols2, rows,
PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 4 * cols2 + cols3, 0, cols6a, rows,
PPMD_NULLDRAWPROC, &fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 4 * cols2 + cols3 + cols6a, 0, cols2, rows,
PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 5 * cols2 + cols3 + cols6a, 0, cols3, rows,
PPMD_NULLDRAWPROC, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 5 * cols2 + 2 * cols3 + cols6a, 0, cols2,
rows, PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 6 * cols2 + 2 * cols3 + cols6a, 0, cols3,
rows, PPMD_NULLDRAWPROC, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 6 * cols2 + 3 * cols3 + cols6a, 0, cols2,
rows, PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 7 * cols2 + 3 * cols3 + cols6a, 0, cols6b,
rows, PPMD_NULLDRAWPROC, &fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 7 * cols2 + 3 * cols3 + cols6a + cols6b, 0,
cols2, rows, PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 8 * cols2 + 3 * cols3 + cols6a + cols6b, 0,
cols2, rows, PPMD_NULLDRAWPROC, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 9 * cols2 + 3 * cols3 + cols6a + cols6b, 0,
cols2, rows, PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 10 * cols2 + 3 * cols3 + cols6a + cols6b,
0, cols3, rows, PPMD_NULLDRAWPROC, &fore1color);
/* Woof. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols, rows2, average_drawproc,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows2, cols, rows3, average_drawproc,
&fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows2 + rows3, cols, rows2,
average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 2 * rows2 + rows3, cols, rows2,
average_drawproc, &fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 3 * rows2 + rows3, cols, rows2,
average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 4 * rows2 + rows3, cols, rows6a,
average_drawproc, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 4 * rows2 + rows3 + rows6a, cols, rows2,
average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 5 * rows2 + rows3 + rows6a, cols, rows3,
average_drawproc, &fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 5 * rows2 + 2 * rows3 + rows6a, cols,
rows2, average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 6 * rows2 + 2 * rows3 + rows6a, cols,
rows3, average_drawproc, &fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 6 * rows2 + 3 * rows3 + rows6a, cols,
rows2, average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 7 * rows2 + 3 * rows3 + rows6a, cols,
rows6b, average_drawproc, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 7 * rows2 + 3 * rows3 + rows6a + rows6b,
cols, rows2, average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 8 * rows2 + 3 * rows3 + rows6a + rows6b,
cols, rows2, average_drawproc, &fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 9 * rows2 + 3 * rows3 + rows6a + rows6b,
cols, rows2, average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0,
10 * rows2 + 3 * rows3 + rows6a + rows6b,
cols, rows3, average_drawproc, &fore2color);
}
static void
tartan(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval) {
unsigned int const cols1 = cols / 22;
unsigned int const rows1 = rows / 22;
unsigned int const cols3 = cols * 3 / 22;
unsigned int const rows3 = rows * 3 / 22;
unsigned int const cols10 = cols - 3 * cols1 - 3 * cols3;
unsigned int const rows10 = rows - 3 * rows1 - 3 * rows3;
unsigned int const cols5a = cols10 / 2;
unsigned int const rows5a = rows10 / 2;
unsigned int const cols5b = cols10 - cols5a;
unsigned int const rows5b = rows10 - rows5a;
pixel const backcolor = randomDarkColor(maxval);
pixel const fore1color = randomBrightColor(maxval);
pixel const fore2color = randomBrightColor(maxval);
/* Warp. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols5a, rows, PPMD_NULLDRAWPROC,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols5a, 0, cols1, rows, PPMD_NULLDRAWPROC,
&fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols5a + cols1, 0, cols5b, rows,
PPMD_NULLDRAWPROC, &backcolor );
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols10 + cols1, 0, cols3, rows,
PPMD_NULLDRAWPROC, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols10 + cols1 + cols3, 0, cols1, rows,
PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols10 + 2 * cols1 + cols3, 0, cols3, rows,
PPMD_NULLDRAWPROC, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols10 + 2 * cols1 + 2 * cols3, 0, cols1,
rows, PPMD_NULLDRAWPROC, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, cols10 + 3 * cols1 + 2 * cols3, 0, cols3,
rows, PPMD_NULLDRAWPROC, &fore2color);
/* Woof. */
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols, rows5a, average_drawproc,
&backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows5a, cols, rows1, average_drawproc,
&fore1color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows5a + rows1, cols, rows5b,
average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows10 + rows1, cols, rows3,
average_drawproc, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows10 + rows1 + rows3, cols, rows1,
average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows10 + 2 * rows1 + rows3, cols, rows3,
average_drawproc, &fore2color);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows10 + 2 * rows1 + 2 * rows3, cols,
rows1, average_drawproc, &backcolor);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, rows10 + 3 * rows1 + 2 * rows3, cols,
rows3, average_drawproc, &fore2color);
}
/*----------------------------------------------------------------------------
Poles stuff
-----------------------------------------------------------------------------*/
#define MAXPOLES 500
static void
placeAndColorPolesRandomly(int * const xs,
int * const ys,
pixel * const colors,
unsigned int const cols,
unsigned int const rows,
pixval const maxval,
unsigned int const poleCt) {
unsigned int i;
for (i = 0; i < poleCt; ++i) {
xs[i] = rand() % cols;
ys[i] = rand() % rows;
colors[i] = randomBrightColor(maxval);
}
}
static void
assignInterpolatedColor(pixel * const resultP,
pixel const color1,
double const dist1,
pixel const color2,
double const dist2) {
if (dist1 == 0)
/* pixel is a pole */
*resultP = color1;
else {
double const sum = dist1 + dist2;
pixval const r = (PPM_GETR(color1)*dist2 + PPM_GETR(color2)*dist1)/sum;
pixval const g = (PPM_GETG(color1)*dist2 + PPM_GETG(color2)*dist1)/sum;
pixval const b = (PPM_GETB(color1)*dist2 + PPM_GETB(color2)*dist1)/sum;
PPM_ASSIGN(*resultP, r, g, b);
}
}
static void
poles(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval) {
unsigned int const poleCt = MAX(2, MIN(MAXPOLES, cols * rows / 30000));
int xs[MAXPOLES], ys[MAXPOLES];
pixel colors[MAXPOLES];
unsigned int row;
placeAndColorPolesRandomly(xs, ys, colors, cols, rows, maxval, poleCt);
/* Interpolate points */
for (row = 0; row < rows; ++row) {
unsigned int col;
for (col = 0; col < cols; ++col) {
double dist1, dist2;
pixel color1, color2;
unsigned int i;
/* Find two closest poles. */
dist1 = dist2 = (SQR((double)cols) + SQR((double)rows));
for (i = 0; i < poleCt; ++i) {
double const newdist =
(double)(col - xs[i]) * (col - xs[i]) +
(double)(row - ys[i]) * (row - ys[i]);
if (newdist < dist1) {
dist2 = dist1;
color2 = color1;
dist1 = newdist;
color1 = colors[i];
} else if (newdist < dist2) {
dist2 = newdist;
color2 = colors[i];
}
}
assignInterpolatedColor(&pixels[row][col],
color1, dist1, color2, dist2);
}
}
}
/*----------------------------------------------------------------------------
Squig stuff
-----------------------------------------------------------------------------*/
#define SQUIGS 5
#define SQ_POINTS 7
#define SQ_MAXCIRCLE_POINTS 5000
static int sq_circlecount;
static pixel sq_colors[SQ_MAXCIRCLE_POINTS];
static ppmd_point sq_offs[SQ_MAXCIRCLE_POINTS];
static ppmd_point
vectorSum(ppmd_point const a,
ppmd_point const b) {
return ppmd_makePoint(a.x + b.x, a.y + b.y);
}
static ppmd_drawprocp sqMeasureCircleDrawproc;
static void
sqMeasureCircleDrawproc(pixel** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval,
ppmd_point const p,
const void * const clientdata) {
sq_offs[sq_circlecount++] = p;
}
static ppmd_drawprocp sqRainbowCircleDrawproc;
static void
sqRainbowCircleDrawproc(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval,
ppmd_point const p,
const void * const clientdata) {
unsigned int i;
for (i = 0; i < sq_circlecount; ++i)
ppmd_point_drawprocp(
pixels, cols, rows, maxval, vectorSum(p, sq_offs[i]),
&sq_colors[i]);
}
static void
sqAssignColors(unsigned int const circlecount,
pixval const maxval,
pixel * const colors) {
pixel const rc1 = randomBrightColor(maxval);
pixel const rc2 = randomBrightColor(maxval);
pixel const rc3 = randomBrightColor(maxval);
float const cco3 = (circlecount - 1) / 3.0;
unsigned int i;
for (i = 0; i < circlecount ; ++i) {
if (i < cco3) {
float const frac = (float)i/cco3;
PPM_ASSIGN(colors[i],
(float) PPM_GETR(rc1) +
((float) PPM_GETR(rc2) - (float) PPM_GETR(rc1)) * frac,
(float) PPM_GETG(rc1) +
((float) PPM_GETG(rc2) - (float) PPM_GETG(rc1)) * frac,
(float) PPM_GETB(rc1) +
((float) PPM_GETB(rc2) - (float) PPM_GETB(rc1)) * frac
);
} else if (i < 2.0 * cco3) {
float const frac = (float)i/cco3 - 1.0;
PPM_ASSIGN(colors[i],
(float) PPM_GETR(rc2) +
((float) PPM_GETR(rc3) - (float) PPM_GETR(rc2)) * frac,
(float) PPM_GETG(rc2) +
((float) PPM_GETG(rc3) - (float) PPM_GETG(rc2)) * frac,
(float) PPM_GETB(rc2) +
((float) PPM_GETB(rc3) - (float) PPM_GETB(rc2)) * frac
);
} else {
float const frac = (float)i/cco3 - 2.0;
PPM_ASSIGN(colors[i],
(float) PPM_GETR(rc3) +
((float) PPM_GETR(rc1) - (float) PPM_GETR(rc3)) * frac,
(float) PPM_GETG(rc3) +
((float) PPM_GETG(rc1) - (float) PPM_GETG(rc3)) * frac,
(float) PPM_GETB(rc3) +
((float) PPM_GETB(rc1) - (float) PPM_GETB(rc3)) * frac
);
}
}
}
static void
clearImageToBlack(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval) {
pixel color;
PPM_ASSIGN(color, 0, 0, 0);
ppmd_filledrectangle(
pixels, cols, rows, maxval, 0, 0, cols, rows, PPMD_NULLDRAWPROC,
&color);
}
static void
chooseWrapAroundPoint(unsigned int const cols,
unsigned int const rows,
ppmd_point * const pFirstP,
ppmd_point * const pLastP,
ppmd_point * const p0P,
ppmd_point * const p1P,
ppmd_point * const p2P,
ppmd_point * const p3P) {
switch (rand() % 4) {
case 0:
p1P->x = rand() % cols;
p1P->y = 0;
if (p1P->x < cols / 2)
pFirstP->x = rand() % (p1P->x * 2 + 1);
else
pFirstP->x = cols - 1 - rand() % ((cols - p1P->x) * 2);
pFirstP->y = rand() % rows;
p2P->x = p1P->x;
p2P->y = rows - 1;
pLastP->x = 2 * p2P->x - pFirstP->x;
pLastP->y = p2P->y - pFirstP->y;
p0P->x = pLastP->x;
p0P->y = pLastP->y - rows;
p3P->x = pFirstP->x;
p3P->y = pFirstP->y + rows;
break;
case 1:
p2P->x = rand() % cols;
p2P->y = 0;
if (p2P->x < cols / 2)
pLastP->x = rand() % (p2P->x * 2 + 1);
else
pLastP->x = cols - 1 - rand() % ((cols - p2P->x) * 2);
pLastP->y = rand() % rows;
p1P->x = p2P->x;
p1P->y = rows - 1;
pFirstP->x = 2 * p1P->x - pLastP->x;
pFirstP->y = p1P->y - pLastP->y;
p0P->x = pLastP->x;
p0P->y = pLastP->y + rows;
p3P->x = pFirstP->x;
p3P->y = pFirstP->y - rows;
break;
case 2:
p1P->x = 0;
p1P->y = rand() % rows;
pFirstP->x = rand() % cols;
if (p1P->y < rows / 2)
pFirstP->y = rand() % (p1P->y * 2 + 1);
else
pFirstP->y = rows - 1 - rand() % ((rows - p1P->y) * 2);
p2P->x = cols - 1;
p2P->y = p1P->y;
pLastP->x = p2P->x - pFirstP->x;
pLastP->y = 2 * p2P->y - pFirstP->y;
p0P->x = pLastP->x - cols;
p0P->y = pLastP->y;
p3P->x = pFirstP->x + cols;
p3P->y = pFirstP->y;
break;
case 3:
p2P->x = 0;
p2P->y = rand() % rows;
pLastP->x = rand() % cols;
if (p2P->y < rows / 2)
pLastP->y = rand() % (p2P->y * 2 + 1);
else
pLastP->y = rows - 1 - rand() % ((rows - p2P->y) * 2);
p1P->x = cols - 1;
p1P->y = p2P->y;
pFirstP->x = p1P->x - pLastP->x;
pFirstP->y = 2 * p1P->y - pLastP->y;
p0P->x = pLastP->x + cols;
p0P->y = pLastP->y;
p3P->x = pFirstP->x - cols;
p3P->y = pFirstP->y;
break;
}
}
static void
squig(pixel ** const pixels,
unsigned int const cols,
unsigned int const rows,
pixval const maxval) {
int i;
clearImageToBlack(pixels, cols, rows, maxval);
/* Draw the squigs. */
ppmd_setlinetype(PPMD_LINETYPE_NODIAGS);
ppmd_setlineclip(0);
for (i = SQUIGS; i > 0; --i) {
unsigned int const radius = (cols + rows) / 2 / (25 + i * 2);
ppmd_point c[SQ_POINTS];
ppmd_point p0, p1, p2, p3;
sq_circlecount = 0;
ppmd_circlep(pixels, cols, rows, maxval,
ppmd_makePoint(0, 0), radius,
sqMeasureCircleDrawproc, NULL);
sqAssignColors(sq_circlecount, maxval, sq_colors);
chooseWrapAroundPoint(cols, rows, &c[0], &c[SQ_POINTS-1],
&p0, &p1, &p2, &p3);
{
/* Do the middle points */
unsigned int j;
for (j = 1; j < SQ_POINTS - 1; ++j) {
c[j].x = (rand() % (cols - 2 * radius)) + radius;
c[j].y = (rand() % (rows - 2 * radius)) + radius;
}
}
ppmd_linep(
pixels, cols, rows, maxval, p0, p1,
sqRainbowCircleDrawproc, NULL);
ppmd_polysplinep(
pixels, cols, rows, maxval, p1, SQ_POINTS, c, p2,
sqRainbowCircleDrawproc, NULL);
ppmd_linep(
pixels, cols, rows, maxval, p2, p3,
sqRainbowCircleDrawproc, NULL);
}
}
int
main(int argc, const char ** argv) {
struct cmdlineInfo cmdline;
pixel ** pixels;
pm_proginit(&argc, argv);
parseCommandLine(argc, argv, &cmdline);
validateComputableDimensions(cmdline.width, cmdline.height);
srand(pm_randseed());
pixels = ppm_allocarray(cmdline.width, cmdline.height);
switch (cmdline.basePattern) {
case PAT_GINGHAM2:
gingham2(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL);
break;
case PAT_GINGHAM3:
gingham3(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL);
break;
case PAT_MADRAS:
madras(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL);
break;
case PAT_TARTAN:
tartan(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL);
break;
case PAT_POLES:
poles(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL);
break;
case PAT_SQUIG:
squig(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL);
break;
case PAT_CAMO:
camo(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL, 0);
break;
case PAT_ANTICAMO:
camo(pixels, cmdline.width, cmdline.height, PPM_MAXMAXVAL, 1);
break;
default:
pm_error("can't happen!");
}
ppm_writeppm(stdout, pixels, cmdline.width, cmdline.height,
PPM_MAXMAXVAL, 0);
ppm_freearray(pixels, cmdline.height);
return 0;
}