>> I may send you some very small code snippets and ask you to comment on
>> them.
ChemFrameRenderer.java calculates the minMagnitude and maxMagnitude for
all the AtomVectors in molecules. Then magnitudeRange is calculated. These
values are passed as parameters to the constructor for AtomVectorShape:
... new AtomVectorShape(atom, settings, minMagnitude, magnitudeRange)
When the AtomVector is rendered these values are used to calculate a scale.
AtomVectorShape.java
--------------------
public void render(Graphics g) {
if (settings.getShowVectors()) {
if (atom.getVector() != null) {
double magnitude = atom.getVector().distance(zeroPoint);
double scaling = (magnitude - minMagnitude) / magnitudeRange
+ 0.5;
ArrowLine al = new ArrowLine(g, atom.getScreenPosition().x,
atom.getScreenPosition().y,
atom.getScreenVector().x,
atom.getScreenVector().y, false, true, scaling);
}
}
}
ArrowLine.java
--------------
double ly = scaling * arrowHeadSize * arrowHeadRadius;
double lx = lengthOffset + directionSign * 2.0 * scaling * arrowHeadSize;
double rx = lx;
double ry = -ly;
double mx = lengthOffset + directionSign * 1.5 * scaling * arrowHeadSize;
My interpretation of what is going on is as follows:
- the normalized scaling is being applied to adjust the arrowhead size in
proportion with the magnitude of the vector
- the vector whose length is minMagnitude will have scaling == 0.5
- the vector whose length is maxMagnitude will have scaling == 1.5
Q: Please confirm that I am interpreting this correctly.
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