/**
* segment curve
*
* @param p1
* @param p2
*/
public void segment(GgbVector p1, GgbVector p2) {
length = (float) p1.distance(p2);
if (Kernel.isEqual(length, 0, Kernel.STANDARD_PRECISION)) return;
down(p1);
switch (arrowType) {
case ARROW_TYPE_NONE:
default:
setTextureX(0, 1);
moveTo(p2);
break;
case ARROW_TYPE_SIMPLE:
float factor = (12 + lineThickness) * LINE3D_THICKNESS / scale;
float arrowPos = ARROW_LENGTH / length * factor;
GgbVector arrowBase = (GgbVector) start.getCenter().mul(arrowPos).add(p2.mul(1 - arrowPos));
setTextureX(0);
if (hasTicks()) {
GgbVector d = p2.sub(p1).normalized();
float thickness = this.thickness;
float i =
ticksOffset * length - ((int) (ticksOffset * length / ticksDistance)) * ticksDistance;
float ticksDelta = thickness;
float ticksThickness = 4 * thickness;
if (i <= ticksDelta) i += ticksDistance;
for (; i <= length * (1 - arrowPos); i += ticksDistance) {
GgbVector p1b = (GgbVector) p1.add(d.mul(i - ticksDelta));
GgbVector p2b = (GgbVector) p1.add(d.mul(i + ticksDelta));
setTextureType(TEXTURE_AFFINE);
setTextureX(i / length);
moveTo(p1b);
setThickness(ticksThickness);
setTextureType(TEXTURE_CONSTANT_0);
moveTo(p1b);
moveTo(p2b);
setThickness(thickness);
moveTo(p2b);
}
}
setTextureType(TEXTURE_AFFINE);
setTextureX(1 - arrowPos);
moveTo(arrowBase);
textureTypeX = TEXTURE_ID;
setTextureX(0, 0);
setThickness(factor * ARROW_WIDTH);
moveTo(arrowBase);
setThickness(0);
moveTo(p2);
break;
}
}
/**
* adds the point with the specified position and tangent to the curve currently being drawn.
*
* @param p the point's position vector
* @param t the tangent at the point
*/
public void addPointToCurve3D(GgbVector3D p, GgbVector3D t) {
GgbVector position = new GgbVector(p.getX(), p.getY(), p.getZ(), 0);
GgbVector tangent = new GgbVector(t.getX(), t.getY(), t.getZ(), 0);
if (firstCurvePoint) {
end = new PlotterBrushSection(position, tangent, thickness);
firstCurvePoint = false;
} else {
if (discontinuityPassed(position)) {
startDrawingCurve(); // start drawing a new segment
addPointToCurve(position, tangent);
return;
} else {
start = end;
end = new PlotterBrushSection(start, position, tangent, thickness);
addCurvePos((float) position.sub(start.getCenter()).norm());
join();
}
}
previousPosition = position;
previousTangent = tangent;
}
/** set the matrix to [V O] */
public void setCoordFromPoints(GgbVector a_O, GgbVector a_I) {
setCoord(a_O, a_I.sub(a_O));
}
/**
* A test used to judge if the curve has passed over a discontinuity since the last point was
* added.
*
* @param position the position of the new point (pos2)
* @return true iff (pos2-pos1)/||pos2-pos1|| . tangent1 < CurveTree.discontinuityThreshold
*/
private boolean discontinuityPassed(GgbVector position) {
GgbVector dir = position.sub(previousPosition).normalized();
if (dir.dotproduct(previousTangent) < CurveTree.discontinuityThreshold) return true;
return false;
}
