======GD Polygons======

=====Code=====

<code c>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <gd.h>

// color values
//
#define BLACK       0
#define GRAY        1
#define VIOLET      2
#define INDIGO      3
#define BLUE        4
#define GREEN       5
#define YELLOW      6
#define ORANGE      7
#define RED         8
#define WHITE       9
#define DARKGREEN   10
                                                                                          
int main(int argc, char **argv)
{
    FILE                *out;       // output file pointer
    char                *outfile;   // output file name
    gdImagePtr          img;        // GD Image Construct
    gdPoint             points[3];  // Points for a Polygon
    unsigned int        color[11];  // color array
    unsigned short int  wide, high, // useful image and
                        x, y;       // coordinate variables

    if (argc == 2)
    {
        outfile = *(argv+1);
    }
    else
    {
        outfile = (char *) malloc (sizeof(char) * 10);
        strcpy(outfile, "image.png");
    }

    fprintf(stdout, "Using '%s' as output filename\n", outfile);

    wide = 800;
    high = 600;

    img = gdImageCreateTrueColor(wide, high);

    // My GD color definitions
    //
    color[BLACK]             = gdImageColorAllocate(img,   0,   0,   0);
    color[BLUE]              = gdImageColorAllocate(img,   0,   0, 255);
    color[GREEN]             = gdImageColorAllocate(img,   0, 255,   0);
    color[DARKGREEN]         = gdImageColorAllocate(img,  51, 107,   0);
    color[RED]               = gdImageColorAllocate(img, 255,   0,   0);
    color[GRAY]              = gdImageColorAllocate(img, 204, 204, 204);
    color[WHITE]             = gdImageColorAllocate(img, 255, 255, 255);

    /* Draw a triangle. */
    points[0x00].x = (wide / 2);
    points[0x00].y = 0;
    points[0x01].x = wide;
    points[0x01].y = high;
    points[0x02].x = 0;
    points[0x02].y = high;

    /* Paint it in white */
    gdImageFilledPolygon(img, points, 3, color[GREEN]);

    /* Outline it in red; must be done second */
    gdImagePolygon(img, points, 3, color[RED]);

    // Output the data
    //
    out = fopen(outfile, "wb");
    gdImagePngEx(img, out, -1);

    // Close things up
    //
    fclose(out);
    gdImageDestroy(img);

    return(0);
}
</code>

=====More Polygons=====

If we made another gdPoint array (points2), what would that following code produce a likeness of?

<code c>
    points2[0x00].x = (wide / 2); 
    points2[0x00].y = (high / 2) - 100;
    points2[0x01].x = (wide / 2) + 200;
    points2[0x01].y = (high / 2) + 100;
    points2[0x02].x = (wide / 2) - 200;
    points2[0x02].y = (high / 2) + 0;
    points2[0x03].x = (wide / 2) + 200;
    points2[0x03].y = (high / 2) + 0;
    points2[0x04].x = (wide / 2) - 200;
    points2[0x04].y = (high / 2) + 100;
    points2[0x05].x = (wide / 2) + 0;
    points2[0x05].y = (high / 2) - 100;
</code>

=====Combining Shapes=====

Write C programs that creates likenesses of the following (don't worry about shading- just see if you can use your skills to recreate these images, and to make additional images of your liking):

{{http://www.corning-cc.edu/images/corning_community_college_flag_logo_170.gif}}

{{http://www.inkity.com/catalog/img/3/3734.jpg}}

{{http://4.bp.blogspot.com/_BVYzhvN_FZc/TMDCwcFM4FI/AAAAAAAAAfg/KsqNqjfvhNw/s1600/red+white+blue+star.JPG}}

{{http://noobproguide.files.wordpress.com/2012/09/triforce.jpg?w=640&h=468}}

{{http://versus-software.com/blog/wp-content/uploads/2011/11/8_bit_Mario_sprite_by_gotbored27.png}}