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&amp;lt;/head&amp;gt;&amp;lt;body&amp;gt;&amp;lt;pre&amp;gt;/*
* File: tween.cpp
* Description: Demonstrates how to tween between two
* images using interpolation.
* Rev: 1.0
* Created: 14 August 00
* Last Update: 15 October 02
* Author: Fran Soddell
* email: F.Soddell@bendigo.latrobe.edu.au
*/
#include &amp;amp;lt;GL/glut.h&amp;amp;gt;
#include &amp;amp;lt;stdio.h&amp;amp;gt;
#include &amp;amp;lt;math.h&amp;amp;gt;
#define PI 3.14159
#define TRUE 1
#define FALSE 0
#define debug0 1
/*
* window management
*/
GLint width=350;
GLint height=350;
GLint initialXposition=50;
GLint initialYposition=50;
/*
* viewport management
*/
GLint vwXorigin;
GLint vwYorigin;
GLint vwWidth;
GLint vwHeight;
/*
* my world window management
*/
GLdouble myXorigin;
GLdouble myYorigin;
GLdouble myWidth;
GLdouble myHeight;
/*
* colour management
*/
#define ALPHA 1.0
#define NUM_COLOURS 8
enum {red,green,blue,pink,paleGreen,
paleBlue,orange,white};
typedef GLfloat colourType[3];
colourType colour[NUM_COLOURS]=
{{1.0,0.0,0.0},{0.0,1.0,0.0},{0.0,0.0,1.0},
{1.0,0.75,0.75},{0.75,1.0,0.75},{0.5,0.75,1.0},
{1.0,0.55,0.0},{1.0,1.0,1.0}
};
/*
* data management
*/
#define MAX_VERTICES 360
#define NUM_STAGES 21
#define INCREMENT 0.05;
enum {x,y};
typedef GLdouble vertexType[2];
vertexType firstImage[MAX_VERTICES];
vertexType secondImage[MAX_VERTICES];
vertexType stage[NUM_STAGES][MAX_VERTICES];
int numVertices=0;
int stageNum=0;
int incrementing=TRUE;
/*
* ********************************************************************
*/
void renderImage(vertexType image[],int mode){
int i;
glBegin(mode);
for(i=0;i&amp;amp;lt;numVertices;i++)
glVertex2dv(image[i]);
glEnd();
}
void renderView(){
glColor3fv(colour[blue]);
renderImage(stage[stageNum],GL_LINE_LOOP);
}
void display(){
glClear(GL_COLOR_BUFFER_BIT);
renderView();
glutSwapBuffers();
}
void reshapeWindow(int w, int h){
width=w;
height=h;
myXorigin=0.0;
myYorigin=0.0;
myWidth=1.0;
myHeight=1.0;
glViewport(0,0,(GLsizei)w,(GLsizei)h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(myXorigin,myWidth,myYorigin,myHeight);
}
void keyboard(unsigned char key,int xMouse,int yMouse){
switch(key){
case 27:
exit(0);
case &amp;#39;t&amp;#39;: if(incrementing){
stageNum++;
if(stageNum==NUM_STAGES-1)
incrementing=FALSE;
}
else{
stageNum--;
if(stageNum==0)
incrementing=TRUE;
}
break;
default:
printf(&amp;amp;quot;%s%d\n&amp;amp;quot;,&amp;amp;quot;key=&amp;amp;quot;,key);
printf(&amp;amp;quot;%s%d\n&amp;amp;quot;,&amp;amp;quot;xMouse=&amp;amp;quot;,xMouse);
printf(&amp;amp;quot;%s%d\n&amp;amp;quot;,&amp;amp;quot;yMouse=&amp;amp;quot;,yMouse);
}
glutPostRedisplay();
}
void setUpGLUT(int argc,char ** argv){
glutInit(&amp;amp;amp;argc,argv);
glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB);
glutInitWindowSize(width,height);
glutInitWindowPosition(initialXposition,initialYposition);
glutCreateWindow(&amp;amp;quot;tweening images&amp;amp;quot;);
/*
* Register callback functions.
*/
glutDisplayFunc(display);
glutReshapeFunc(reshapeWindow);
glutKeyboardFunc(keyboard);
}
void initialiseGL(){
glClearColor(colour[white][red],
colour[white][green],
colour[white][blue],ALPHA);
}
void interpolate(){
int i,j,coordinate;
GLdouble t=0.0,temp1,temp2;
for(i=0;i&amp;amp;lt;NUM_STAGES;i++){
for(j=0;j&amp;amp;lt;numVertices;j++){
for(coordinate=x;coordinate&amp;amp;lt;=y;coordinate++){
temp1=firstImage[j][coordinate];
temp2=secondImage[j][coordinate];
stage[i][j][coordinate]=(1.0-t)*temp1+t*temp2;
}
}
t=t+INCREMENT;
}
}
int setUpImage(FILE * infile, int imageNum){
enum {bad,good};
int status=good;
int coordinate=x;
int vertexNum=0;
GLfloat nextCoord;
if((fscanf(infile,&amp;amp;quot;%d&amp;amp;quot;,&amp;amp;amp;numVertices))!=1)
return bad;
if(numVertices&amp;amp;lt;=0)
return bad;
if(numVertices&amp;amp;gt;MAX_VERTICES)
numVertices=MAX_VERTICES;
while(vertexNum&amp;amp;lt;numVertices){
if(fscanf(infile,&amp;amp;quot;%f&amp;amp;quot;,&amp;amp;amp;nextCoord)&amp;amp;lt;0)
return bad;
if(imageNum==1)
firstImage[vertexNum][coordinate]=nextCoord;
else
secondImage[vertexNum][coordinate]=nextCoord;
if(coordinate==x)
coordinate=y;
else{
coordinate=x;
vertexNum++;
}
}
if((vertexNum!=numVertices)||(coordinate!=x))
status=bad;
return status;
}
int processFiles(char ** argv){
enum {bad,good};
int status=0;
FILE * infile1, * infile2;
if(!(infile1=fopen(argv[1],&amp;amp;quot;r&amp;amp;quot;))){
fprintf(stderr,&amp;amp;quot;\n%s%s\n&amp;amp;quot;,
&amp;amp;quot;cannot open &amp;amp;quot;,argv[1]);
return bad;
}
if(!(infile2=fopen(argv[2],&amp;amp;quot;r&amp;amp;quot;))){
fprintf(stderr,&amp;amp;quot;\n%s%s\n&amp;amp;quot;,
&amp;amp;quot;cannot open &amp;amp;quot;,argv[2]);
fclose(infile1);
return bad;
}
status=setUpImage(infile1,1);
if(status&amp;amp;gt;0)
status=setUpImage(infile2,2);
if(fclose(infile1) &amp;amp;lt; 0)
return bad;
if(fclose(infile2) &amp;amp;lt; 0)
return bad;
return status;
}
int initialise(int argc,char**argv){
enum {bad,good};
int status=0;
if(argc&amp;amp;lt;3){
fprintf(stderr,&amp;amp;quot;\n%s%s%s\n%s\n%s\n&amp;amp;quot;,
&amp;amp;quot;Usage: &amp;amp;quot;,argv[0],&amp;amp;quot; infile1 infile2&amp;amp;quot;,
&amp;amp;quot;Reads in vertices from two files.&amp;amp;quot;,
&amp;amp;quot;Then tweens the resulting two images.&amp;amp;quot;);
return bad;
}
status=processFiles(argv);
interpolate();
return status;
}
int main(int argc,char ** argv){
int successful;
successful=initialise(argc,argv);
if(!successful){
fprintf(stderr,&amp;amp;quot;\n%s\n\n&amp;amp;quot;,
&amp;amp;quot;error: exiting program&amp;amp;quot;);
exit(1);
}
setUpGLUT(argc,argv);
initialiseGL();
glutMainLoop();
return 0;
}
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