/*
    Demonstrates minimal graphic toolkit 'gt'.
    On UNIX, use the supplied 'makefile' in this 'gt' directory.
    On for example Apple Macintosh (CodeWarrior for instance), just include this
    file together sourcefile 'gt.c' in the C project.

    You can set and get RGB-pixels and draw lines, and you can save your images
    in JPEG-format. 
    Pieter Suurmond, april 3, 2004.
*/

#include <stdio.h>
#include <stdlib.h>

#include "gt.h"                         /* Link with object gt.o. */

/*----------------------------------------------------------------------------------*/
int main()
{                                       /* Generate 5 images in current directory.  */
    short           e;
    RGBPICp         pic;                /* Pointer to RGB picture object in memory. */
    int             n, x;
    char            filename[64];
    float           hertz, RGBflt[3];

    n = gtCreateMemRGB(&pic,            /* Receive pointer to RGBPIC object here.   */
                       512, 240,        /* Specify width and height.                */
                       255, 255, 255);  /* Specify white background.                */
    if (n)
        { printf("gtCreateMemRGB() = %d\n", n); return 1; }

    /*------------------------------------ A SMALL RAINBOW: -----------------*/
    gtInitHertzToRGBtables();
    for (x = 0; x < 512; x++)
        {
        hertz = 40.0e13 + (37.0e13 * (float)x / 511.0);
        gtHertzToRGB(hertz, 1.0, RGBflt);        
        gtDrawLine(pic,
                   x, 2,                                /* From x1,y1 */
                   x, 50,                               /* to x2,y2.  */
                   (unsigned char)(0.5 + RGBflt[0]),    /* R. */
                   (unsigned char)(0.5 + RGBflt[1]),    /* G. */
                   (unsigned char)(0.5 + RGBflt[2]));   /* B. */
        
        }
    /*-----------------------------------------------------------------------*/
    n = 0;
    do  {
        sprintf(filename, "graphicTest%d.jpg", n);
        /*------------------------------------*/
        for (x=0; x<10; x++)
            {
            gtDrawLine(pic,
                       160,     120 + (4 * n),          /* From x1,y1 */
                       20 * n,  120 + 10 * x,           /* to x2,y2.  */
                       (unsigned char)(255 - 20 * n),   /* R. */
                       (unsigned char)0,                /* G. */
                       (unsigned char)(20 * n));        /* B. */
            }
        gtDrawString(pic,
                     100, 100,                          /* x,y.   */
                     0, (unsigned char)(20 * n), 0,     /* r,g,b. */
                     1, filename);                      /* 1=transparent. */
        gtDrawString(pic,
                     100, 120,                          /* x,y.   */
                     0, (unsigned char)(255-(20*n)), 0, /* r,g,b. */
                     0, "Hello");                       /* 0=white bg. */
        /*------------------------------------*/
        e = gtSaveMemRGB(pic,
                        filename,
                        40 + (n * 10));     /* Increasing JPEG Quality: 40-80%. */
        } while ((n++ < 5) && (!e));
    /*-------------------------------------------------------------*/
    gtDestroyMemRGB(&pic);
    if (e)
        { printf("Failed to save '%s' to disk.\n", filename); return 2; }
    return(0);
}