//
// Normalize the vector (X,Y,Z) so that X*X + Y*Y + Z*Z = 1.
//
// The normalization divisor is returned. If the divisor is zero, no
// normalization occurs.
//
double normalize_vector(double cvec[]) {
double divisor;
divisor = Math.sqrt((double) DOT_PRODUCT(cvec, cvec));
if (divisor > 0.0) {
cvec[X] /= divisor;
cvec[Y] /= divisor;
cvec[Z] /= divisor;
}
return divisor;
}
//
// Interface resized method.
//
public void resized(int width, int height) {
double dx = eyeX - centerX;
double dy = eyeY - centerY;
double dz = eyeZ - centerZ;
double d = Math.sqrt(dx * dx + dy * dy + dz * dz);
double fovy = 2.0 * 180.0 / Math.PI * Math.atan(radius / d);
double near = d - radius;
double far = d + radius;
double xUnits, yUnits;
if (width >= height) {
xUnits = 2 * radius * width / height;
yUnits = 2 * radius;
} else {
xUnits = 2 * radius;
yUnits = 2 * radius * height / width;
}
// setup projection matrix
go.matrixMode(Go.PROJECTION);
go.identity();
if (perspective) {
if (width >= height) {
go.perspective(fovy, xUnits / yUnits, near, far);
} else {
double r = radius * yUnits / xUnits;
double fovyModified = Math.atan(r / d) * 180.0 / Math.PI * 2.0;
go.perspective(fovyModified, xUnits / yUnits, near, far);
}
} else {
go.ortho(-xUnits / 2.0, xUnits / 2.0, -yUnits / 2.0, yUnits / 2.0, near, far);
}
go.matrixMode(Go.MODELVIEW);
}