课件讲稿课件computer graphics

Computer

GraphicsChen

xue

gongTeaching

Material

and

References

1.Donald

Hearn,M.Pauline

Baker,Computer

Graphics

with

OpenGL,ThirdEdition,电子工业出版社，2004.

2.Dave

Shreiner,Mason

Woo,OpenGL编程指南（OpenGL

Programming

Guide,Fifth

Edition),机械工业出版社，2006.Section1.Building

OpenGLApplication

1.Copy

GLUT.dll

and

GLUT32.dll

to

folderSysten322.Copy

GLUT32.lib

to

vc

lib

folder3.Copy

glut.h

to

vc

include

folder4.New

a

console

project5.Edit

or

import

OpenGL

codepile

and

run

applicationSection1.Building

OpenGLApplication7.Example(1)colormat.c(2)material.c(3)pointp.c(4)line.cSection2.

Graphics

Output(1)1.Coordinate

system(1)Screen

coordinates(2)World

coordinates(Cartesian

coordinat2.OpenGL

projections3.OpenGL

point

functions4.OpenGL

line

functions5.Line-drawing

algorithmsSection2.

Graphics

Output(1)DDA(digital

differential

analyzer)

algorithmSection2.

Graphics

Output(1)Bresenham’s

line

algorithmSection2.

Graphics

Output(1)Bresenham’s

line

algorithm–

d1=

dx(2y1-2y0-1)=2dy-dx;–if(di>=0){– yi=yi-1+1;– di+1=di+2(dy-dx);–

}else

{yi=yi-1

;di+1=di+2dy;–

}Section3.

Graphics

Output(2)1.

PolygonConvex(凸)

polygon: all

interior

angles

of

apolygon

are

less

than

or

equal

to

180°.Concave(凹)polygon:

a

polygon

is

not

convex.Degenerate(退化)polygon:

a

set

of

verticesthat

are

collinear

or

at

the

same

position.In

OpenGL,

a

fill

area

must

be

specified

asa

convex

polygon.Section3.

Graphics

Output(2)2.OpenGL

polygon

fill-area

functions–

glRect*(x1,

y1,

x2,

y2);glBegin(GL_POLYGON);glBegin(GL_TRIANGLES);glBegin(GL_TRIANGLE_STRIP);glBegin(GL_TRIANGLE_FAN);glBegin(GL_QUADS);glBegin(GL_QUAD_STRIP);examples:

polys.cSection3.

Graphics

Output(2)3.OpenGL

bitmap

and

image

functionsglBitmap(width,

height,

x0,

y0,

dx,

dy,

bitmaglRasterPos*();glDrawPixel(width,

height,

dataFormat,dataType,

pixmap);Section3.

Graphics

Output(2)4.OpenGL

display

lists(显示列表)glGenLists(number);glNewList(listID,

listMode);glCalnlList(listID);example

:

font.c,

image.cSection4.

GeometricTransformations(1)1.Projectionsvoid

glOrtho(GLdouble

left,

GLdouble

right,GLdouble

bottom,

GLdouble

top,

GLdoublezNear,

GLdouble

zFar);void

glOrtho2D(GLdouble

left,

GLdouble

rightGLdouble

bottom,

GLdouble

top);Section4.

GeometricTransformations(1)nearfarview

directiontopbottomleftrightSection4.

GeometricTransformations(1)Section4.

GeometricTransformations(1)void

glFrustum(GLdouble

left,

GLdouble

rightGLdouble

bottom,

GLdouble

top,

GLdoublezNear,

GLdouble

zFar);void

glFrustum(GLdouble

left,

GLdouble

rightGLdouble

bottom,

GLdouble

top,

GLdoublezNear,

GLdouble

zFar);Section4.

GeometricTransformations(1)farleft

rightnearbottomtopview

pointSection4.

GeometricTransformations(1)Section4.

GeometricTransformations(1)2.Model-view

transformationsvoid

glRotate{f,d}(TYPE

angle,

TYPE

x,TYPE y,

TYPE

z);void

glTranslate{f,d}(TYPE x,

TYPE y,

TYPEz);void

glScale{f,d}(TYPE x,

TYPE y,

TYPE

z);3.Example

:

geometryTransform.cSection5.

GeometricTransformations(2)1.TranslationSection5.

GeometricTransformations(2)2.ScaleSection5.

GeometricTransformations(2)3.RotationSection6.Texture1、Texture

Functionsvoid

glGenTextures(GLsizei

n,GLuint

*textures);void

glTexImage2D(GLenum

target,GLint

level,GLintinternalFormat,GLsizei

width,

GLsizeiheight,GLintborder,

GLenum

format,

GLenum

type,const

GLvoid*pixels);void

glTexImage1D(GLenum

target,GLint

level,GLintinternalFormat,GLsizei

width,

GLsizeiheight,GLintborder,

GLenum

format,

GLenum

type,const

GLvoid*pixels);Section6.Texture2.Texture

Parametersvoid

glTexParameter{i,f}(GLenum

target,

GLenumpName,TYPE

param);void

glTexParameter{i,f}v(GLenum

target,

GLenumpName,TYPE

*param);functions：set

texture

parameters.

input：target

is

texture

type(GL_TEXTURE_1D，GL_TEXTURE_2D)，pName

is

texture

name(GL_TEXTURE_BORDER_COLOR、

GL_TEXTURE_WRAP_S、GL_TEXTURE_WRAP_T、

GL_TEXTURE_MIN_FILTER、GL_TEXTURE_MAG_FILTER)，paramif

valueof

pName.output：nothing.return：nothing.Section6.Texture3、Texture

Coordinatevoid

glTexCoord{1,2,3,4}{d,f,i,s}(TYPE

s,TYPE

t,

TYPE

r,

TYPE

q);void

glTexCoord{1,2,3,4}{d,f,i,s}v(const

TYP*v);4.Examples

:

windmill.cppSection7.

Curves

(1)1.Hermite

CurvesSection7.

Curves

(1)Section7.

Curves

Curves

(1)2.Spline

CurvesSection7.

Curves

(1)Section8.

Curves

(2)Section8.

Curves

(2)Section8.

Curves

(2)Section8.

Curves

(2)Section8.

Curves

(2)Section9.

Surfaces(1)Section9.

Surfaces(1)Section9.

Surfac