3D Grab Handle

OpenGL OpenGL: Advanced Coding
1

Hi!

I am working on a simple 3D editor and I am trying to reproduce the “grab, scale, rotate” handle like in blender, or maya… To let the user manipulate a specific object on a specific axis…I try many thing but I don’t know what Im doing wrong but its just not looking right…

Please help!!!

Tks in advance,


	glMatrixMode( GL_PROJECTION );
	glPushMatrix();
	glLoadIdentity();

	glOrtho( 0.0f,
			 (GLfloat)widget->allocation.width,
			 0.0f,
			 (GLfloat)widget->allocation.height,
			 -100.0f, 100.0f );

	glMatrixMode( GL_MODELVIEW );
	glPushMatrix();
	glLoadIdentity();
	
	glDisable( GL_DEPTH_TEST );
	glDepthMask( GL_FALSE );
	{
		if( object_selection  )
		{
			glPushMatrix();
			{
				glTranslatef( ( float )sx, ( float )sy, 0.0f );
				glRotatef( 35.0f, 0.0f, 1.0f, 0.0f );

				// X
				glColor4f( 1.0f, 0.0f, 0.0f, 1.0f );

				glBegin( GL_LINES );
					glVertex3f( 0.0f, 0.0f, 0.0f );
					glVertex3f( 50.0f, 0.0f, 0.0f );
				glEnd();
	

				// Z
				glColor4f( 0.0f, 0.0f, 1.0f, 1.0f );

				glBegin( GL_LINES );
					glVertex3f( 0.0f, 0.0f, 0.0f );
					glVertex3f( 0.0f, 50.0f, 0.0f );
				glEnd();


				// Y
				glColor4f( 0.0f, 1.0f, 0.0f, 1.0f );

				glBegin( GL_LINES );
					glVertex3f( 0.0f, 0.0f, 0.0f );
					glVertex3f( 0.0f, 0.0f, 50.0f );
				glEnd();

			}
			glPopMatrix();
		}
	}
	glMatrixMode( GL_PROJECTION );
	glPopMatrix();

	glMatrixMode( GL_MODELVIEW );
	glPopMatrix();
	
	glEnable( GL_DEPTH_TEST );
	glDepthMask( GL_TRUE );