2018年元旦鼠标控制球旋转代码

2021年1月6日发(作者：董范园)
测试发现，还是NEHE的鼠标旋转物体效果好啊，但NEHE是在基于Windows 的程序框架下
编写的，不少代码融入到了windows编程中，感觉比较混乱，所以就想提取出来，在基于
控制台的框架下实现出来，在此框架下代码结构比较简单，便于以后再使用这些代码，也就
是便于代码复 用。主程序代码如下
#include
#include
#include
#include
#include
object
GLfloat vertices[] = {-1.0,-1.0,-1.0,1.0,-1.0,-1.0,
1.0,1.0,-1.0, -1.0,1.0,-1.0, -1.0,-1.0,1.0,
1.0,-1.0,1.0, 1.0,1.0,1.0, -1.0,1.0,1.0};
GLfloat colors[] = {0.0,0.0,0.0,1.0,0.0,0.0,
1.0,1.0,0.0, 0.0,1.0,0.0, 0.0,0.0,1.0,
1.0,0.0,1.0, 1.0,1.0,1.0, 0.0,1.0,1.0};
GLubyte cubeIndices []={0,3,2,1,2,3,7,6,0,4,7,3,1,2,6,5,4,5,6,7,0,1,5, 4};
mouse control
Matrix4fT Transform = { 1.0f, 0.0f, 0.0f, 0.0f, NEW: Final Transform
0.0f, 1.0f, 0.0f, 0.0f,
0.0f, 0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 0.0f, 1.0f };
Matrix3fT LastRot = { 1.0f, 0.0f, 0.0f, NEW: Last Rotation
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f };
Matrix3fT ThisRot = { 1.0f, 0.0f, 0.0f, NEW: This Rotation
0.0f, 1.0f, 0.0f,
0.0f, 0.0f, 1.0f };
ArcBallT ArcBall(640.0f, 480.0f); NEW: ArcBall Instance
Point2fT MousePt; NEW: Current Mouse Point
bool isClicked = false; NEW: Clicking The Mouse?
bool isDragging = false; NEW: Dragging The Mouse?

void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glPushMatrix(); NEW: Prepare Dynamic Transform
glMultMatrixf(Transform.M); NEW: Apply Dynamic Transform
glDrawElements(GL_QUADS, 24, GL_UNSIGNED_BYTE, cubeIndices);
glPopMatrix();
glutSwapBuffers();
}
void mouse(int btn, int state, int x, int y)
{
if(btn==GLUT_LEFT_BUTTON)
{
switch(state)
{
case GLUT_DOWN:
isClicked = true;
printf_s(
break;
case GLUT_UP:
isClicked = false;
isDragging = false;
printf_s(
break;
}
}
if(btn==GLUT_RIGHT_BUTTON && state == GLUT_DOWN)
{
Matrix3fSetIdentity(&LastRot); Reset Rotation
Matrix3fSetIdentity(&ThisRot); Reset Rotation
Matrix4fSetRotationFromMatrix3f(&Transform, &ThisRot); Reset Rotation
glutPostRedisplay();
}
}
void mouseMotion(int x, int y)
{
MousePt.s.X = x;
MousePt.s.Y = y;
if (!isDragging) Not Dragging
{
if (isClicked) First Click
{
isDragging = true; Prepare For Dragging
LastRot = ThisRot; Set Last Static Rotation To Last Dynamic
One
(&MousePt); Update Start Vector And Prepare For
Dragging
}
}
else
{
if (isClicked) Still Clicked, So Still Dragging
{
Quat4fT ThisQuat;
(&MousePt, &ThisQuat); Update End Vector And Get Rotation
As Quaternion
Matrix3fSetRotationFromQuat4f(&ThisRot, &ThisQuat); Convert Quaternion Into
Matrix3fT
Matrix3fMulMatrix3f(&ThisRot, &LastRot); Accumulate Last Rotation Into This
One
Matrix4fSetRotationFromMatrix3f(&Transform, &ThisRot); Set Our Final Transform's
Rotation From This One
}
}
glutPostRedisplay();
}
void keyboard(unsigned char key, int x, int y)
{
switch (key)
{
case 27: VK_ESCAPE
exit(0);
break;
}
}
void myReshape(int w, int h)
{
glViewport(0, 0, w, h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
if (w <= h)
glOrtho(-2.0, 2.0, -2.0 * (GLfloat) h (GLfloat) w, 2.0 * (GLfloat) h (GLfloat) w, -10.0, 10.0);
else
glOrtho(-2.0 * (GLfloat) w (GLfloat) h, 2.0 * (GLfloat) w (GLfloat) h, -2.0, 2.0, -10.0, 10.0);
glMatrixMode(GL_MODELVIEW);
}
void main(int argc, char **argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(500, 500);
glutCreateWindow(
glutReshapeFunc(myReshape);
glutDisplayFunc(display);
glutMouseFunc(mouse);
glutMotionFunc(mouseMotion);
glutKeyboardFunc(keyboard);
glEnable(GL_DEPTH_TEST);
glEnableClientState(GL_COLOR_ARRAY);
glEnableClientState(GL_VERTEX_ARRAY);
glVertexPointer(3, GL_FLOAT, 0, vertices);
glColorPointer(3,GL_FLOAT, 0, colors);
glClearColor(0.0,0.0,0.0,1.0);
glColor3f(1.0,1.0,1.0);
glutMainLoop();
}
，另外再包含NEHE教程中的ArcBall.h和程序。
中包含的头文件还要做如下修改
#include 注释掉
#include 注释掉
#include 做修改