I have a simple red rectangle rendered in a window, and I created an arcball in order to rotate it in any direction. I was following the code from NeHe's Arcball Rotation tutorial.
The problem is that once the rectangle is rendered and the left mouse button is clicked, it spins like a top in the window. The mouse click-drag-stop update happens every time the mouse is moved, which is the reason why it spins that way. I am not able to figure out a way to restrict the rotation only for the duration of the click-drag-stop. How do I restrict the rotation? I have been trying to debug this for about 4-5 days now with no luck.
I added the original Arcball.h and Arcball.cpp files to my project, with one change to to the header file; I simply created a default constructor for the Arcball_t class with this line -
ArcBall_t() {};
The only other changes from the original project are that I threw the Update() function call into my code:
// ==========================================================================================
// function declarations
#define GET_PROC_ADDRESS( str ) wglGetProcAddress( str )
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
void DrawOpenGLScene(HDC hDC);
void Update();
HGLRC SetUpOpenGLContext(HWND hWnd);
// ==========================================================================================
// Trackball declarations
const float PI2 = 2.0*3.1415926535f; // PI Squared
GLUquadricObj *quadratic;
Point2fT MousePt; // NEW: Current Mouse Point
bool isClicked = false; // NEW: Clicking The Mouse?
bool isRClicked = false; // NEW: Clicking The Right Mouse Button?
bool isDragging = false; // NEW: Dragging The Mouse?
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 };
// ==========================================================================================
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpszCmdLine, int nCmdShow)
{
static char szClassName[] = "Myclass";
static char szTitle[]="A Simple Win32 API OpenGL Program";
WNDCLASS wc;
MSG msg;
HWND hWnd;
wc.style = CS_OWNDC | CS_HREDRAW | CS_VREDRAW;
wc.lpfnWndProc = (WNDPROC)WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = NULL;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)GetStockObject (BLACK_BRUSH);
wc.lpszMenuName = NULL;
wc.lpszClassName = szClassName;
if (!RegisterClass (&wc))
return 0;
hWnd = CreateWindow(szClassName, szTitle,
WS_OVERLAPPEDWINDOW |
// NEED THESE for OpenGL calls to work!
WS_CLIPCHILDREN | WS_CLIPSIBLINGS,
0, 0, 1024, 256,
NULL, NULL, hInstance, NULL);
ArcBall_t ArcBall(1024.0f, 256.0f); // NEW: ArcBall Instance
ShowWindow(hWnd, nCmdShow);
UpdateWindow( hWnd );
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage( &msg );
DispatchMessage( &msg );
}
return(msg.wParam);
}
// ==========================================================================================
//*******************************************************
// This is the brain of the loop
// Checks for a new key press or mouse movement
// renders when something is detected
//*******************************************************
LRESULT CALLBACK WndProc( HWND hWnd, UINT msg,
WPARAM wParam, LPARAM lParam )
{
HDC hDC;
static HGLRC hRC; // Note this is STATIC!
PAINTSTRUCT ps;
switch (msg)
{
case WM_CREATE:
// Select a pixel format and create a rendering context
hRC = SetUpOpenGLContext(hWnd);
break;
case WM_PAINT:
// Draw the scene
// Get a DC, make RC current & associate it with this DC
hDC = BeginPaint(hWnd, &ps);
wglMakeCurrent(hDC, hRC);
DrawOpenGLScene(hDC); // Draw
// We're done with the RC, so deselect it
wglMakeCurrent(NULL, NULL);
EndPaint(hWnd, &ps);
break;
//*NEW* Mouse based messages for arcball
case WM_LBUTTONUP:
isClicked = false;
break;
case WM_RBUTTONUP:
isRClicked = false;
break;
case WM_LBUTTONDOWN:
isClicked = true;
break;
case WM_RBUTTONDOWN:
isRClicked = true;
break;
case WM_MOUSEMOVE:
MousePt.s.X = (GLfloat)LOWORD(lParam);
MousePt.s.Y = (GLfloat)HIWORD(lParam);
isClicked = (LOWORD(wParam) & MK_LBUTTON) ? true : false;
isRClicked = (LOWORD(wParam) & MK_RBUTTON) ? true : false;
Update();
RedrawWindow(hWnd, NULL, NULL, RDW_INTERNALPAINT);
break;
case WM_DESTROY:
// Clean up and terminate
wglDeleteContext(hRC);
PostQuitMessage(0);
break;
default:
return DefWindowProc(hWnd, msg, wParam, lParam);
}
return (0);
}
// ==========================================================================================
//*******************************************************
// SetUpOpenGL sets the pixel format and a rendering
// context then returns the RC
//*******************************************************
HGLRC SetUpOpenGLContext(HWND hWnd)
{
static PIXELFORMATDESCRIPTOR pfd = {
sizeof (PIXELFORMATDESCRIPTOR), // strcut size
1, // Version number
PFD_DRAW_TO_WINDOW | // Flags, draw to a window,
PFD_SUPPORT_OPENGL | // use OpenGL
PFD_DOUBLEBUFFER, // Use a double buffer
PFD_TYPE_RGBA, // RGBA pixel values
32, // 24-bit color
0, 0, 0, // RGB bits & shift sizes.
0, 0, 0, // Don't care about them
0, 0, // No alpha buffer info
0, 0, 0, 0, 0, // No accumulation buffer
32, // 32-bit depth buffer
8, // No stencil buffer
0, // No auxiliary buffers
PFD_MAIN_PLANE, // Layer type
0, // Reserved (must be 0)
0, // No layer mask
0, // No visible mask
0 // No damage mask
};
int nMyPixelFormatID;
HDC hDC;
HGLRC hRC;
hDC = GetDC(hWnd);
nMyPixelFormatID = ChoosePixelFormat(hDC, &pfd);
SetPixelFormat(hDC, nMyPixelFormatID, &pfd);
hRC = wglCreateContext(hDC);
ReleaseDC(hWnd, hDC);
quadratic=gluNewQuadric(); // Create A Pointer To The Quadric Object
gluQuadricNormals(quadratic, GLU_SMOOTH); // Create Smooth Normals
gluQuadricTexture(quadratic, GL_TRUE); // Create Texture Coords
return hRC;
}
// ==========================================================================================
// simple test code - rectangle/triangle
void DrawOpenGLScene(HDC hDC)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glMatrixMode( GL_MODELVIEW );
glTranslatef(0.0f, 0.0f, 0.0f);
glColor3f(1.0, 0.0, 0.0); // drawing color
glBegin(GL_POLYGON); // define the rectangle
glVertex2f(-0.5,-0.5);
glVertex2f(-0.5,0.5);
glVertex2f(0.5,0.5);
glVertex2f(0.5,-0.5);
glEnd();
glMultMatrixf(Transform.M);
glFlush(); // force execution
SwapBuffers(hDC);
}
// ==========================================================================================
void Update () // Perform Motion Updates Here
{
ArcBall_t ArcBall;
if (isRClicked) // If Right Mouse Clicked, Reset All Rotations
{
Matrix3fSetIdentity(&LastRot); // Reset Rotation
Matrix3fSetIdentity(&ThisRot); // Reset Rotation
Matrix4fSetRotationFromMatrix3f(&Transform, &ThisRot); // Reset Rotation
}
if (!isDragging) // Not Dragging
{
if (isClicked) // First Click
{
isDragging = true; // Prepare For Dragging
LastRot = ThisRot; // Set Last Static Rotation To Last Dynamic One
ArcBall.click(&MousePt); // Update Start Vector And Prepare For Dragging
}
}
else
{
if (isClicked) // Still Clicked, So Still Dragging
{
Quat4fT ThisQuat;
ArcBall.drag(&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
}
else // No Longer Dragging
isDragging = false;
}
}
EDIT: I fixed the issue with the uncontrollable scene rotation by inserting a check within the case WM_MOUSEMOVE: handler of the WndProc() routine. The check was: if(isClicked == true) { //code }, and that seemed to do the trick. It no longer spins like a top. However, I still do not have fine control over the rotation; it still spins like a top within the click-drag-release duration.
