private void setQuadParams() {
quad = glu.gluNewQuadric();
glu.gluQuadricDrawStyle(quad, GLU.GLU_FILL);
glu.gluQuadricNormals(quad, GLU.GLU_FLAT);
glu.gluQuadricOrientation(quad, GLU.GLU_OUTSIDE);
glu.gluQuadricTexture(quad, true);
}
/**
* //! Draw a pretty arrow on the z-axis using a cone and a cylinder (using GLUT)
*
* @param aArrowStart
* @param aArrowTip
* @param aWidth
*/
public static void jDrawArrow(
final JVector3d aArrowStart, final JVector3d aArrowTip, final double aWidth) {
GL2 gl = GLContext.getCurrent().getGL().getGL2();
gl.glPushMatrix();
// We don't really care about the up vector, but it can't
// be parallel to the arrow...
JVector3d up = new JVector3d(0, 1, 0);
// JVector3d arrow = aArrowTip-aArrowStart;
JVector3d arrow = new JVector3d(0, 0, 0);
arrow.normalize();
double d = Math.abs(JMaths.jDot(up, arrow));
if (d > .9) {
up = new JVector3d(1, 0, 0);
}
JMatrixGL.jLookAt(gl, aArrowStart, aArrowTip, up);
double distance = JMaths.jDistance(aArrowTip, aArrowStart);
// This flips the z axis around
gl.glRotatef(180, 1, 0, 0);
// create a new OpenGL quadratic object
GLUquadric quadObj;
quadObj = glu.gluNewQuadric();
// set rendering style
glu.gluQuadricDrawStyle(quadObj, GLU.GLU_FILL);
// set normal-rendering mode
glu.gluQuadricNormals(quadObj, GLU.GLU_SMOOTH);
// render a cylinder and a cone
gl.glRotatef(180, 1, 0, 0);
glu.gluDisk(quadObj, 0, aWidth, 10, 10);
gl.glRotatef(180, 1, 0, 0);
glu.gluCylinder(quadObj, aWidth, aWidth, distance * ARROW_CYLINDER_PORTION, 10, 10);
gl.glTranslated(0, 0, ARROW_CYLINDER_PORTION * distance);
gl.glRotatef(180, 1, 0, 0);
glu.gluDisk(quadObj, 0, aWidth * 2.0, 10, 10);
gl.glRotatef(180, 1, 0, 0);
glu.gluCylinder(quadObj, aWidth * 2.0, 0.0, distance * ARRROW_CONE_PORTION, 10, 10);
// delete our quadric object
glu.gluDeleteQuadric(quadObj);
gl.glPopMatrix();
}
/**
* Render a sphere given a radius.
*
* @param aRadius
* @param aNumSlices
* @param aNumStacks
*/
public static void jDrawSphere(final double aRadius, final int aNumSlices, final int aNumStacks) {
// allocate a new OpenGL quadric object for rendering a sphere
GLUquadric quadObj;
quadObj = glu.gluNewQuadric();
// set rendering style
glu.gluQuadricDrawStyle(quadObj, GLU.GLU_FILL);
// set normal-rendering mode
glu.gluQuadricNormals(quadObj, GLU.GLU_SMOOTH);
// render a sphere
glu.gluSphere(quadObj, aRadius, aNumSlices, aNumStacks);
// delete our quadric object
glu.gluDeleteQuadric(quadObj);
}