home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
Graphics Programming Black Book (Special Edition)
/
BlackBook.bin
/
disk1
/
source
/
chapter39
/
polygon.h
< prev
Wrap
C/C++ Source or Header
|
1997-06-18
|
1KB
|
34 lines
/* 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 */
};