com.sun.javafx.geom.CubicIterator Maven / Gradle / Ivy
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package com.sun.javafx.geom;
import java.util.NoSuchElementException;
import com.sun.javafx.geom.transform.BaseTransform;
/**
* A utility class to iterate over the path segments of a cubic curve
* segment through the PathIterator interface.
*
* @version 10 Feb 1997
*/
class CubicIterator implements PathIterator {
CubicCurve2D cubic;
BaseTransform transform;
int index;
CubicIterator(CubicCurve2D q, BaseTransform tx) {
this.cubic = q;
this.transform = tx;
}
/**
* Return the winding rule for determining the insideness of the
* path.
* @see #WIND_EVEN_ODD
* @see #WIND_NON_ZERO
*/
@Override
public int getWindingRule() {
return WIND_NON_ZERO;
}
/**
* Tests if there are more points to read.
* @return true if there are more points to read
*/
@Override
public boolean isDone() {
return (index > 1);
}
/**
* Moves the iterator to the next segment of the path forwards
* along the primary direction of traversal as long as there are
* more points in that direction.
*/
@Override
public void next() {
++index;
}
/**
* Returns the coordinates and type of the current path segment in
* the iteration.
* The return value is the path segment type:
* SEG_MOVETO, SEG_LINETO, SEG_QUADTO, SEG_CUBICTO, or SEG_CLOSE.
* A float array of length 6 must be passed in and may be used to
* store the coordinates of the point(s).
* Each point is stored as a pair of float x,y coordinates.
* SEG_MOVETO and SEG_LINETO types will return one point,
* SEG_QUADTO will return two points,
* SEG_CUBICTO will return 3 points
* and SEG_CLOSE will not return any points.
* @see #SEG_MOVETO
* @see #SEG_LINETO
* @see #SEG_QUADTO
* @see #SEG_CUBICTO
* @see #SEG_CLOSE
*/
@Override
public int currentSegment(float[] coords) {
if (isDone()) {
throw new NoSuchElementException("cubic iterator iterator out of bounds");
}
int type;
if (index == 0) {
coords[0] = cubic.x1;
coords[1] = cubic.y1;
type = SEG_MOVETO;
} else {
coords[0] = cubic.ctrlx1;
coords[1] = cubic.ctrly1;
coords[2] = cubic.ctrlx2;
coords[3] = cubic.ctrly2;
coords[4] = cubic.x2;
coords[5] = cubic.y2;
type = SEG_CUBICTO;
}
if (transform != null) {
transform.transform(coords, 0, coords, 0, index == 0 ? 1 : 3);
}
return type;
}
}