鼠标控制物体缩放旋转（opengl+glut）

#include"stdlib.h" #include"iostream" #include"gltools.h" #include"GLBatch.h" #include"GLShaderManager.h" #include"math.h" #ifdef __APPLE__ #include <glut/glut.h> // OS X version of GLUT #else #define FREEGLUT_STATIC #include <GL/glut.h> // Windows FreeGlut equivalent #endif using namespace std; GLShaderManager shaderManager; GLTriangleBatch sphereBatch; bool mouseLeftDown=false; bool mouseRightDown=false; float mouseX,mouseY; float cameraZ; float rotX,rotY; const float offset = 0.01; void ChangeSize(GLint w,GLint h) { if(h == 0) h = 1; glViewport(0,0,w,h); glMatrixMode(GL_PROJECTION); glLoadIdentity(); gluPerspective(60,(GLfloat)w/(GLfloat)h,0.1,100); glMatrixMode(GL_MODELVIEW); glLoadIdentity(); } void RenderScene() { glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); //不要忘记加载模型视图矩阵！！！ glMatrixMode(GL_MODELVIEW); glLoadIdentity(); //简单地调用以下平移和旋转函数实现控制 glTranslatef(0,0,cameraZ); glRotatef(rotX, 1.0f, 0.0f, 0.0f); glRotatef(rotY, 0.0f, 1.0f, 0.0f); glColor3f(0,1,1); glPolygonMode(GL_FRONT_AND_BACK,GL_LINE); sphereBatch.Draw(); glutSwapBuffers(); // glutPostRedisplay(); } /* //button:GLUT_LEFT_BUTTON , GLUT_MIDDLE_BUTTON , GLUT_RIGHT_BUTTON //state:GLUT_DOWN , GLUT_UP //x , y坐标值 */ void mouse(int button, int state, int x, int y) { mouseX = x; mouseY = y; if(button == GLUT_LEFT_BUTTON) { if( state == GLUT_DOWN) mouseLeftDown = true; else if(state == GLUT_UP) mouseLeftDown = false; } else if(button == GLUT_RIGHT_BUTTON) { if( state == GLUT_DOWN) mouseRightDown = true; else if(state == GLUT_UP) mouseRightDown = false; } glutPostRedisplay(); } void motion(int x, int y) { float dx = x-mouseX; float dy = y-mouseY; //x与y的位置相互颠倒 if(mouseLeftDown == true) { rotY += dx; rotX += dy; } else if(mouseRightDown == true) { cameraZ += dy*offset; } mouseX = x; mouseY = y; glutPostRedisplay(); } void SetupRC() { glClearColor(0,0,0,1); glEnable(GL_DEPTH_TEST); gltMakeSphere(sphereBatch,5,15,30); } int main(int argc, char* argv[]) { gltSetWorkingDirectory(argv[0]); glutInit(&argc, argv); glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGBA |GLUT_DEPTH); glutInitWindowSize(800, 600); glutCreateWindow("MouseMotion"); glutReshapeFunc(ChangeSize); glutDisplayFunc(RenderScene); glutMouseFunc(mouse); glutMotionFunc(motion); GLenum err = glewInit(); if (GLEW_OK != err) { fprintf(stderr, "GLEW Error: %s\n", glewGetErrorString(err)); return 1; } SetupRC(); glutMainLoop(); return 0; }