《OpenGL超级宝典》反弹的正方形动画出不来？！

2014-11-06 02:30:30 115 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

【保姆级教程/代码】GNSS反演大气可降水量(Precipitable Water Vapor, PWV) GPS精密单点定位（PPP）是一种采用精密卫星星历和卫星钟差进行非差单点定位的方法，在观测过程中采用双频载波相位观测法以确保高精度定位精度。本文利用PPP技术来求解天顶对流层延迟（zenith tropospheric delay，ZTD）。ZTD由湿延迟（ZWD）和干延迟（ZHD）组成，其中占比90%的ZHD与地面测站高程、大气压和测站纬度等参数有良好的相关性，可以通过Saastamoinen模型精确求出；阅读详情



#include <windows.h>

#include <stdio.h>

#define GLUT_DISABLE_ATEXIT_HACK

#include <GL/glut.h>

#include <GL/gl.h>

#include <GL/glu.h>



GLfloat x1 = 100.0f;

GLfloat y10 = 150.0f;

GLsizei rsize = 50;

GLfloat xstep = 1.0f;

GLfloat ystep = 1.0f;

GLfloat windowWidth;

GLfloat windowHeight;



void init()

{

    glClearColor(0.0f,1.0f,1.0f,1.0f);

}

void RenderScene()

{

    glClear(GL_COLOR_BUFFER_BIT);

    glColor3f(1.0f,1.0f,0.0f);

    glRectf(x1,y10,x1 + rsize,y10 + rsize);

    glutSwapBuffers();

}

void TimerFunction(int value)

{

    if(x1 > windowWidth - rsize||x1 < 0)

        xstep = -xstep;

    if(y10 > windowHeight - rsize||y10 < 0)

        ystep = -ystep;

    if(x1 > windowWidth - rsize)

        x1 = windowWidth - rsize - 1;

    if(y10 > windowHeight - rsize)

        y10 = windowHeight - rsize - 1;

    x1 += xstep;

    y10 += ystep;

    

    glutPostRedisplay();

    glutTimerFunc(33,TimerFunction,1);

}



void ChangeSize(GLsizei w,GLsizei h)

{

    if(h == 0)

        h = 1;

    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    if(w <= h)

        glOrtho(0.0f,250.0f,0.0f,250.0f * h / w,1.0f,-1.0f);

    else

        glOrtho(0.0f,250.0f * w / h,0.0f,250.0f,1.0f,-1.0f);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

}

void main()

{

    glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB);

    glutInitWindowPosition(100,0);//屏幕左上角为原点（0,0）

    glutInitWindowSize(600,600);

    glutCreateWindow("test");

    glutDisplayFunc(RenderScene);

    glutReshapeFunc(ChangeSize);

    glutTimerFunc(33,TimerFunction,1);

    init();

    glutMainLoop();

}