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testimage.cpp
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testimage.cpp
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// $Revision: 1.2 $
// testimage.cpp
// (c) 2004-2022 Matthew Arcus
// MIT License
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include "utils.h"
#include "image.h"
const long double pi = 3.14159265358979323846;
Rgb foreground(0,0,0);
Rgb background(255, 255, 255);
const char* usage = "Usage: %s [-w n] [-h n]\n";
class SpiralPlotter : public LinePlotter
{
bool GetXY(double t, double&x, double&y) const
{
x = t * cos (1/t);
y = t * sin (1/t);
x *= 200;
y *= 200;
x += 200;
y += 200;
return true;
}
};
class ThingPlotter : public LinePlotter
{
public:
ThingPlotter(double a_, double b_) : a(a_), b(b_) {};
bool GetXY(double t, double&x, double&y) const
{
x = cos (a * t);
y = sin (b * t);
x *= 200;
y *= 200;
x += 200;
y += 200;
return true;
}
private:
double a;
double b;
};
class CirclePlotter : public LinePlotter
{
bool GetXY(double t, double&x, double&y) const
{
x = cos(t);
y = sin(t);
x *= 200;
y *= 200;
x += 250;
y += 200;
return true;
}
};
class TanPlotter : public LinePlotter
{
bool GetXY(double t, double&x, double&y) const
{
x = t/(pi*2);
y = tan(t)/(pi*2);
x *= 200;
y *= 200;
x += 200;
y += 200;
return true;
}
};
int main(int argc, char* argv[])
{
int width = 360;
int height = 180;
int equalarea = false;
char *progname = argv[0];
argc--;argv++;
while (argc > 0) {
if (strcmp(argv[0],"-w") == 0) {
argc--; argv++;
if (argc == 0) { error(usage, progname); };
width = atoi(argv[0]);
} else if (strcmp(argv[0], "-h") == 0) {
argc--; argv++;
if (argc == 0) { error(usage, progname); };
height = atoi(argv[0]);
} else if (strcmp(argv[0], "-bg") == 0) {
argc--; argv++;
if (argc == 0) { error(usage, progname); };
int r,g,b;
sscanf(argv[0],"%d:%d:%d",&r,&g,&b);
background.r = r;
background.g = g;
background.b = b;
} else if (strcmp(argv[0], "-fg") == 0) {
argc--; argv++;
if (argc == 0) { error(usage, progname); };
int r,g,b;
sscanf(argv[0],"%d:%d:%d",&r,&g,&b);
foreground.r = r;
foreground.g = g;
foreground.b = b;
} else if (strcmp(argv[0], "-equalarea") == 0) {
equalarea = true;
} else {
error(usage, progname);
}
argc--; argv++;
}
Image outImage;
outImage.Create(width, height);
outImage.Fill(0); // Set to all black
#if 0
for (int i = 0; i < 62; i+=1) {
double x0 = cos(i * 2 * pi/64);
double y0 = sin(i * 2 * pi/64);
double x1 = cos((i + 1) * 2 * pi/64);
double y1 = sin((i + 1) * 2 * pi/64);
x0 *= 200;
y0 *= 200;
x1 *= 200;
y1 *= 200;
if (i%2 == 1) {
x0 += 200;
y0 += 200;
x1 += 200;
y1 += 200;
} else {
x0 += 196;
y0 += 196;
x1 += 196;
y1 += 196;
}
outImage.DrawLine(x0,y0,x1,y1,Rgb(255,0,0));
}
#endif
#if 0
SpiralPlotter plotter;
CirclePlotter plotter2;
TanPlotter plotter3;
ThingPlotter plotter4(10,11);
ThingPlotter plotter5(9,17);
outImage.PlotLine(0, pi/2, plotter, Rgb(0,0,255));
outImage.PlotLine(0, 2 * pi, plotter2, Rgb(0,255,0));
outImage.PlotLine(-2*pi, 2*pi, plotter3, Rgb(255,0,0));
outImage.PlotLine(0, 2 * pi, plotter4, Rgb(0,255,255), 197);
outImage.PlotLine(0, 2 * pi, plotter5, Rgb(255,0,255), 197);
#endif
#if 0
for (int i = 0; i < 20; i++) {
outImage.DrawLine(0, 0, 200, i * 10, Rgb(255,0,0));
outImage.DrawLine(i * 10, 0, 0, 200, Rgb(0,255,0));
}
#endif
#if 1
if (equalarea) {
double xsize = width / 36.0;
int ysize = height / 18;
int index, x, y;
for (index = 0, y = 0; y < height; y++) {
double k = cos (pi * (0.5 * height - y)/height);
for (x = 0; x < width; x++, index++) {
double realx = k * (0.5 * width - x);
bool neg = (realx < 0.0);
realx = fabs(realx);
int i = int(floor(realx/xsize))%2;
if (neg) i = 1 - i;
if (i == (y/ysize)%2){
outImage.SetRgb(index,foreground);
} else {
outImage.SetRgb(index,background);
}
}
}
} else {
int xsize = width / 36;
int ysize = height / 18;
int index = 0;
for (int y = 0; y < height; y++) {
for (int x = 0; x < width; x++, index++) {
if ((x/xsize)%2 == (y/ysize)%2) {
outImage.SetRgb(index,foreground);
} else {
outImage.SetRgb(index,background);
}
}
}
}
#endif
outImage.Write(NULL);
return 0;
}