/**
* {@inheritDoc}
*
* @see org.eclipse.draw3d.AbstractSurface#getYAxis(org.eclipse.draw3d.geometry.Vector3f)
*/
@Override
protected Vector3f getYAxis(Vector3f io_result) {
ICamera camera = m_scene.getCamera();
Vector3f yAxis = camera.getUpVector(io_result);
yAxis.scale(-1);
return yAxis;
}
/**
* Creates a new cylinder with the given position, number of segments and radius proportions.
*
* @param i_position3D the position of this shape
* @param i_segments the number of segments
* @param i_radiusProportions the radius proportions
* @param i_superimposed whether this shape is superimposed
*/
public CylinderShape(
IPosition3D i_position3D, int i_segments, float i_radiusProportions, boolean i_superimposed) {
super(i_position3D);
m_superimposed = i_superimposed;
if (i_segments < 3)
throw new IllegalArgumentException("cylinders must have at least 3 segments");
if (i_radiusProportions < 0 || i_radiusProportions > 1)
throw new IllegalArgumentException("radius proportions must be between 0 and 1, inclusive");
CylinderConfigKey key = new CylinderConfigKey(i_segments, i_radiusProportions);
m_config = CONFIG_CACHE.get(key);
if (m_config == null) {
// calculate top vertices
IVector3f[] top = new IVector3f[i_segments];
double c = 0;
double a = 2 * Math.PI / i_segments;
for (int i = 0; i < i_segments; i++) {
float x = (float) Math.cos(c) / 2 + 0.5f;
float y = (float) Math.sin(c) / 2 + 0.5f;
top[i] = new Vector3fImpl(x, y, 1);
c += a;
}
// calculate bottom vertices
IVector3f[] bottom;
if (i_radiusProportions == 0) bottom = new IVector3f[] {new Vector3fImpl(0.5f, 0.5f, 0)};
else {
bottom = new IVector3f[i_segments];
for (int i = 0; i < top.length; i++) {
Vector3f v = new Vector3fImpl(top[i]);
if (i_radiusProportions != 1) {
v.translate(-0.5f, -0.5f, -1);
v.scale(i_radiusProportions);
v.translate(0.5f, 0.5f, 0);
} else v.translate(0, 0, -1);
bottom[i] = v;
}
}
m_config = new CylinderConfig(i_radiusProportions, top, bottom);
CONFIG_CACHE.put(key, m_config);
}
m_fillKey = new CylinderKey(i_segments, i_radiusProportions, false);
m_outlineKey = new CylinderKey(i_segments, i_radiusProportions, true);
}