使用内插的艺术和动画 内插动画 房子变 T字形 源代码

#include<windows.h>
#include<math.h>
#include <gl/Glut.h>
#include <iostream>
#include <vector>

using namespace std;

const GLint screenWidth = 1050;
const GLint screenHeight = 200;

struct GLPoint{
    GLdouble x, y;
};

GLPoint ptA[9] = {{100,0},{200,50},{200,200},{130,200},{130,130},{80,130},{80,200},{0,200},{0,50}};
GLPoint ptB[9] = {{100,50},{200,50},{200,100},{130,100},{130,200},{80,200},{80,100},{0,100},{0,50}};
GLPoint ptC[9] = {{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0},{0,0}};

void myDisplay(void);
void myInit(void);

void setWindow(GLdouble left, GLdouble right , GLdouble botton, GLdouble top);
void setViewport(GLdouble left, GLdouble right , GLdouble botton, GLdouble top);
void drawTween(GLPoint ptA[],GLPoint ptB[],int n, float t);


int main(int argc, char ** argv){

    glutInit(&argc, argv);
    glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
    glutInitWindowSize(screenWidth,screenHeight);
    glutInitWindowPosition(100,100);
    glutCreateWindow("内插动画");

    setWindow(0,screenWidth,0,screenHeight);
    setViewport(0,screenWidth,0,screenHeight);

    glutDisplayFunc(myDisplay);

    myInit();
    glutMainLoop();

    return 0;
}

void setViewport(GLdouble left, GLdouble right , GLdouble botton, GLdouble top){
    glViewport(left,right,right-left,top-botton);
}


void setWindow(GLdouble left, GLdouble right , GLdouble botton, GLdouble top){
    glMatrixMode(GL_PROJECTION);
    glLoadIdentity();
    gluOrtho2D(left,right,botton,top);
}


void drawTween(GLPoint ptA[],GLPoint ptB[],int n, float t){
    for(int i = 0 ; i < n; i++){
        ptC[i].x = ptA[i].x + (ptB[i].x - ptA[i].x) * t;
        ptC[i].y = ptA[i].y + (ptB[i].y - ptA[i].y) * t;
    }
    glBegin(GL_LINE_LOOP);
        for (int j = 0; j< n ; j++)
        {
            glVertex2d(ptC[j].x, screenHeight - ptC[j].y);
        }
    glEnd();
    glFlush();

}


void myDisplay(void){
    
    //cout<<sizeof(ptA)/sizeof(ptA[0])<<endl;  //数组长度
glClear(GL_COLOR_BUFFER_BIT);
    
GLdouble t = 0.0;
for ( int i = 0; i<5; i++)
{
    setWindow(0.0,(GLdouble)screenWidth,0.0,(GLdouble)screenHeight);
    glViewport(i*200,0,1000,200);
    drawTween(ptA,ptB,9,t);
    t+=0.25;
    
}

//drawTween(ptA,9,0);

    /*glClear(GL_COLOR_BUFFER_BIT);
    drawTween(ptA,ptB,9,0.5);*/
}

void myInit(void){
    glClearColor(1.0,1.0,1.0,0.0);
    glColor3f(0.0f, 0.0f, 0.0f);        

    glPointSize(1.0);
    glLineWidth(2.0);

}