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<HTML>
<HEAD>
<META name=vsisbn content="1576101746">
<META name=vstitle content="Michael Abrash's Graphics Programming Black Book, Special Edition">
<META name=vsauthor content="Michael Abrash">
<META name=vspublisher content="The Coriolis Group">
<META name=vspubdate content="07/01/97">
<META name=vscategory content="Web and Software Development: Game Development,Web and Software Development: Graphics and Multimedia Development">
<TITLE>Michael Abrash's Graphics Programming Black Book Special Edition: The Polygon Primeval</TITLE>
<!-- HEADER -->
<!-- Empty Reference Subhead -->
<!--ISBN=1576101746//-->
<!--TITLE=Michael Abrash's Graphics Programming Black Book Special Edition//-->
<!--AUTHOR=Michael Abrash//-->
<!--PUBLISHER=The Coriolis Group, Inc.//-->
<!--CHAPTER=38//-->
<!--PAGES=717-720//-->
<!--UNASSIGNED1//-->
<!--UNASSIGNED2//--></HEAD><BODY LINK=#0000FF ALINK=#000099 VLINK=#0000FF BGCOLOR=#FFFFFF>
<CENTER>
<TABLE BORDER>
<TR>
<TD><A HREF="38-02.html">Previous</A></TD>
<TD><A HREF="index.html">Table of Contents</A></TD>
<TD><A HREF="38-04.html">Next</A></TD>
</TR>
</TABLE>
</CENTER>
<P><BR></P>
<P><B>LISTING 38.3 L38-3.C</B></P>
<!-- CODE //-->
<PRE>
/* Sample program to exercise the polygon-filling routines. This code
and all polygon-filling code has been tested with Borland and
Microsoft compilers. */
#include &lt;conio.h&gt;
#include &lt;dos.h&gt;
#include &#147;polygon.h&#148;
/* Draws the polygon described by the point list PointList in color
Color with all vertices offset by (X,Y) */
#define DRAW_POLYGON(PointList,Color,X,Y) \
Polygon.Length = sizeof(PointList)/sizeof(struct Point); \
Polygon.PointPtr = PointList; \
FillConvexPolygon(&ampPolygon, Color, X, Y);
void main(void);
extern int FillConvexPolygon(struct PointListHeader *, int, int, int);
void main() {
int i, j;
struct PointListHeader Polygon;
static struct Point ScreenRectangle[] =
{{0,0},{320,0},{320,200},{0,200}};
static struct Point ConvexShape[] =
{{0,0},{121,0},{320,0},{200,51},{301,51},{250,51},{319,143},
{320,200},{22,200},{0,200},{50,180},{20,160},{50,140},
{20,120},{50,100},{20,80},{50,60},{20,40},{50,20}};
static struct Point Hexagon[] =
{{90,-50},{0,-90},{-90,-50},{-90,50},{0,90},{90,50}};
static struct Point Triangle1[] = {{30,0},{15,20},{0,0}};
static struct Point Triangle2[] = {{30,20},{15,0},{0,20}};
static struct Point Triangle3[] = {{0,20},{20,10},{0,0}};
static struct Point Triangle4[] = {{20,20},{20,0},{0,10}};
union REGS regset;
/* Set the display to VGA mode 13h, 320&#215;200 256-color mode */
regset.x.ax = 0&#215;0013; /* AH = 0 selects mode set function,
AL = 0&#215;13 selects mode 0&#215;13
when set as parameters for INT 0&#215;10 */
int86(0&#215;10, &ampregset, &ampregset);
/* Clear the screen to cyan */
DRAW_POLYGON(ScreenRectangle, 3, 0, 0);
/* Draw an irregular shape that meets our definition of convex but
is not convex by any normal description */
DRAW_POLYGON(ConvexShape, 6, 0, 0);
getch(); /* wait for a keypress */
/* Draw adjacent triangles across the top half of the screen */
for (j=0; j&lt;=80; j&#43;=20) {
for (i=0; i&lt;290; i &#43;= 30) {
DRAW_POLYGON(Triangle1, 2, i, j);
DRAW_POLYGON(Triangle2, 4, i&#43;15, j);
}
}
/* Draw adjacent triangles across the bottom half of the screen */
for (j=100; j&lt;=170; j&#43;=20) {
/* Do a row of pointing-right triangles */
for (i=0; i&lt;290; i &#43;= 20) {
DRAW_POLYGON(Triangle3, 40, i, j);
}
/* Do a row of pointing-left triangles halfway between one row
of pointing-right triangles and the next, to fit between */
for (i=0; i&lt;290; i &#43;= 20) {
DRAW_POLYGON(Triangle4, 1, i, j&#43;10);
}
}
getch(); /* wait for a keypress */
/* Finally, draw a series of concentric hexagons of approximately
the same proportions in the center of the screen */
for (i=0; i&lt;16; i&#43;&#43;) {
DRAW_POLYGON(Hexagon, i, 160, 100);
for (j=0; j&lt;sizeof(Hexagon)/sizeof(struct Point); j&#43;&#43;) {
/* Advance each vertex toward the center */
if (Hexagon[j].X != 0) {
Hexagon[j].X -= Hexagon[j].X &gt;= 0 ? 3 : -3;
Hexagon[j].Y -= Hexagon[j].Y &gt;= 0 ? 2 : -2;
} else {
Hexagon[j].Y -= Hexagon[j].Y &gt;= 0 ? 3 : -3;
}
}
}
getch(); /* wait for a keypress */
/* Return to text mode and exit */
regset.x.ax = 0&#215;0003; /* AL = 3 selects 80&#215;25 text mode */
int86(0&#215;10, &ampregset, &ampregset);
}
</PRE>
<!-- END CODE //-->
<P><B>LISTING 38.4 POLYGON.H</B></P>
<!-- CODE //-->
<PRE>
/* POLYGON.H: Header file for polygon-filling code */
/* Describes a single point (used for a single vertex) */
struct Point {
int X; /* X coordinate */
int Y; /* Y coordinate */
};
/* Describes a series of points (used to store a list of vertices that
describe a polygon; each vertex is assumed to connect to the two
adjacent vertices, and the last vertex is assumed to connect to the
first) */
struct PointListHeader {
int Length; /* # of points */
struct Point * PointPtr; /* pointer to list of points */
};
/* Describes the beginning and ending X coordinates of a single
horizontal line */
struct HLine {
int XStart; /* X coordinate of leftmost pixel in line */
int XEnd; /* X coordinate of rightmost pixel in line */
};
/* Describes a Length-long series of horizontal lines, all assumed to
be on contiguous scan lines starting at YStart and proceeding
downward (used to describe a scan-converted polygon to the
low-level hardware-dependent drawing code) */
struct HLineList {
int Length; /* # of horizontal lines */
int YStart; /* Y coordinate of topmost line */
struct HLine * HLinePtr; /* pointer to list of horz lines */
};
</PRE>
<!-- END CODE //-->
<P><BR></P>
<CENTER>
<TABLE BORDER>
<TR>
<TD><A HREF="38-02.html">Previous</A></TD>
<TD><A HREF="index.html">Table of Contents</A></TD>
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</TR>
</TABLE>
</CENTER>
<hr width="90%" size="1" noshade>
<div align="center">
<font face="Verdana,sans-serif" size="1">Graphics Programming Black Book &copy; 2001 Michael Abrash</font>
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