Use backtick code blocks for syntax highlighting
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James Gregory
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203 changed files with 26546 additions and 25801 deletions
166
51-06.md
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51-06.md
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@ -12,88 +12,90 @@ pages: 965-967
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**LISTING 51.5 POLYGON.H**
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/* POLYGON.H: Header file for polygon-filling code, also includes a number of
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useful items for 3D animation. */
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#define MAX_POLY_LENGTH 4 /* four vertices is the max per poly */
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#define SCREEN_WIDTH 320
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#define SCREEN_HEIGHT 240
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#define PAGE0_START_OFFSET 0
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#define PAGE1_START_OFFSET (((long)SCREEN_HEIGHT*SCREEN_WIDTH)/4)
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/* Ratio: distance from viewpoint to projection plane / width of projection
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plane. Defines the width of the field of view. Lower absolute values = wider
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fields of view; higher values = narrower. */
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#define PROJECTION_RATIO -2.0 /* negative because visible Z coordinates are negative */
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/* Draws the polygon described by the point list PointList in color Color with
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all vertices offset by (X,Y) */
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#define DRAW_POLYGON(PointList,NumPoints,Color,X,Y) \
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Polygon.Length = NumPoints; Polygon.PointPtr = PointList; \
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FillConvexPolygon(&Polygon, Color, X, Y);
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/* Describes a single 2D point */
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struct Point {
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int X; /* X coordinate */
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int Y; /* Y coordinate */
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};
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/* Describes a single 3D point in homogeneous coordinates */
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struct Point3 {
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double X; /* X coordinate */
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double Y; /* Y coordinate */
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double Z; /* Z coordinate */
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double W;
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};
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/* Describes a series of points (used to store a list of vertices that
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describe a polygon; each vertex is assumed to connect to the two adjacent
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vertices, and the last vertex is assumed to connect to the first) */
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struct PointListHeader {
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int Length; /* # of points */
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struct Point * PointPtr; /* pointer to list of points */
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};
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/* Describes beginning and ending X coordinates of a single horizontal line */
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struct HLine {
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int XStart; /* X coordinate of leftmost pixel in line */
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int XEnd; /* X coordinate of rightmost pixel in line */
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};
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/* Describes a Length-long series of horizontal lines, all assumed to be on
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contiguous scan lines starting at YStart and proceeding downward (describes
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a scan-converted polygon to low-level hardware-dependent drawing code) */
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struct HLineList {
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int Length; /* # of horizontal lines */
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int YStart; /* Y coordinate of topmost line */
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struct HLine * HLinePtr; /* pointer to list of horz lines */
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};
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struct Rect { int Left, Top, Right, Bottom; };
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/* Structure describing one face of an object (one polygon) */
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struct Face {
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int * VertNums; /* pointer to vertex ptrs */
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int NumVerts; /* # of vertices */
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int Color; /* polygon color */
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};
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/* Structure describing an object */
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struct Object {
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int NumVerts;
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struct Point3 * VertexList;
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struct Point3 * XformedVertexList;
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struct Point3 * ProjectedVertexList;
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struct Point * ScreenVertexList;
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int NumFaces;
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struct Face * FaceList;
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};
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extern void XformVec(double Xform[4][4], double * SourceVec, double * DestVec);
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extern void ConcatXforms(double SourceXform1[4][4],
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double SourceXform2[4][4], double DestXform[4][4]);
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extern void XformAndProjectPoly(double Xform[4][4],
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struct Point3 * Poly, int PolyLength, int Color);
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extern int FillConvexPolygon(struct PointListHeader *, int, int, int);
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extern void Set320x240Mode(void);
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extern void ShowPage(unsigned int StartOffset);
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extern void FillRectangleX(int StartX, int StartY, int EndX,
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int EndY, unsigned int PageBase, int Color);
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extern void XformAndProjectPoints(double Xform[4][4],struct Object * ObjectToXform);
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extern void DrawVisibleFaces(struct Object * ObjectToXform);
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extern void AppendRotationX(double XformToChange[4][4], double Angle);
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extern void AppendRotationY(double XformToChange[4][4], double Angle);
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extern void AppendRotationZ(double XformToChange[4][4], double Angle);
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extern int DisplayedPage, NonDisplayedPage;
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extern struct Rect EraseRect[];
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```c
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/* POLYGON.H: Header file for polygon-filling code, also includes a number of
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useful items for 3D animation. */
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#define MAX_POLY_LENGTH 4 /* four vertices is the max per poly */
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#define SCREEN_WIDTH 320
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#define SCREEN_HEIGHT 240
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#define PAGE0_START_OFFSET 0
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#define PAGE1_START_OFFSET (((long)SCREEN_HEIGHT*SCREEN_WIDTH)/4)
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/* Ratio: distance from viewpoint to projection plane / width of projection
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plane. Defines the width of the field of view. Lower absolute values = wider
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fields of view; higher values = narrower. */
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#define PROJECTION_RATIO -2.0 /* negative because visible Z coordinates are negative */
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/* Draws the polygon described by the point list PointList in color Color with
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all vertices offset by (X,Y) */
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#define DRAW_POLYGON(PointList,NumPoints,Color,X,Y) \
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Polygon.Length = NumPoints; Polygon.PointPtr = PointList; \
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FillConvexPolygon(&Polygon, Color, X, Y);
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/* Describes a single 2D point */
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struct Point {
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int X; /* X coordinate */
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int Y; /* Y coordinate */
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};
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/* Describes a single 3D point in homogeneous coordinates */
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struct Point3 {
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double X; /* X coordinate */
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double Y; /* Y coordinate */
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double Z; /* Z coordinate */
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double W;
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};
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/* Describes a series of points (used to store a list of vertices that
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describe a polygon; each vertex is assumed to connect to the two adjacent
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vertices, and the last vertex is assumed to connect to the first) */
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struct PointListHeader {
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int Length; /* # of points */
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struct Point * PointPtr; /* pointer to list of points */
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};
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/* Describes beginning and ending X coordinates of a single horizontal line */
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struct HLine {
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int XStart; /* X coordinate of leftmost pixel in line */
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int XEnd; /* X coordinate of rightmost pixel in line */
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};
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/* Describes a Length-long series of horizontal lines, all assumed to be on
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contiguous scan lines starting at YStart and proceeding downward (describes
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a scan-converted polygon to low-level hardware-dependent drawing code) */
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struct HLineList {
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int Length; /* # of horizontal lines */
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int YStart; /* Y coordinate of topmost line */
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struct HLine * HLinePtr; /* pointer to list of horz lines */
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};
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struct Rect { int Left, Top, Right, Bottom; };
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/* Structure describing one face of an object (one polygon) */
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struct Face {
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int * VertNums; /* pointer to vertex ptrs */
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int NumVerts; /* # of vertices */
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int Color; /* polygon color */
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};
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/* Structure describing an object */
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struct Object {
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int NumVerts;
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struct Point3 * VertexList;
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struct Point3 * XformedVertexList;
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struct Point3 * ProjectedVertexList;
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struct Point * ScreenVertexList;
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int NumFaces;
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struct Face * FaceList;
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};
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extern void XformVec(double Xform[4][4], double * SourceVec, double * DestVec);
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extern void ConcatXforms(double SourceXform1[4][4],
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double SourceXform2[4][4], double DestXform[4][4]);
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extern void XformAndProjectPoly(double Xform[4][4],
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struct Point3 * Poly, int PolyLength, int Color);
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extern int FillConvexPolygon(struct PointListHeader *, int, int, int);
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extern void Set320x240Mode(void);
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extern void ShowPage(unsigned int StartOffset);
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extern void FillRectangleX(int StartX, int StartY, int EndX,
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int EndY, unsigned int PageBase, int Color);
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extern void XformAndProjectPoints(double Xform[4][4],struct Object * ObjectToXform);
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extern void DrawVisibleFaces(struct Object * ObjectToXform);
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extern void AppendRotationX(double XformToChange[4][4], double Angle);
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extern void AppendRotationY(double XformToChange[4][4], double Angle);
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extern void AppendRotationZ(double XformToChange[4][4], double Angle);
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extern int DisplayedPage, NonDisplayedPage;
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extern struct Rect EraseRect[];
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```
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### A Note on Rounding Negative Numbers {#Heading6}
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