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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 an ellipse through the PathIterator interface.
Version:10 Feb 1997
/** * A utility class to iterate over the path segments of an ellipse * through the PathIterator interface. * * @version 10 Feb 1997 */
class EllipseIterator implements PathIterator { double x, y, w, h; BaseTransform transform; int index; EllipseIterator(Ellipse2D e, BaseTransform tx) { this.x = e.x; this.y = e.y; this.w = e.width; this.h = e.height; this.transform = tx; if (w < 0f || h < 0f) { index = 6; } }
Return the winding rule for determining the insideness of the path.
See Also:
/** * Return the winding rule for determining the insideness of the * path. * @see #WIND_EVEN_ODD * @see #WIND_NON_ZERO */
public int getWindingRule() { return WIND_NON_ZERO; }
Tests if there are more points to read.
Returns:true if there are more points to read
/** * Tests if there are more points to read. * @return true if there are more points to read */
public boolean isDone() { return index > 5; }
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.
/** * 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. */
public void next() { ++index; } // ArcIterator.btan(Math.PI/2) public static final double CtrlVal = 0.5522847498307933; /* * ctrlpts contains the control points for a set of 4 cubic * bezier curves that approximate a circle of radius 0.5 * centered at 0.5, 0.5 */ private static final double pcv = 0.5 + CtrlVal * 0.5; private static final double ncv = 0.5 - CtrlVal * 0.5; private static final double ctrlpts[][] = { { 1.0, pcv, pcv, 1.0, 0.5, 1.0 }, { ncv, 1.0, 0.0, pcv, 0.0, 0.5 }, { 0.0, ncv, ncv, 0.0, 0.5, 0.0 }, { pcv, 0.0, 1.0, ncv, 1.0, 0.5 } };
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 Also:
/** * 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 */
public int currentSegment(float[] coords) { if (isDone()) { throw new NoSuchElementException("ellipse iterator out of bounds"); } if (index == 5) { return SEG_CLOSE; } if (index == 0) { double ctrls[] = ctrlpts[3]; coords[0] = (float) (x + ctrls[4] * w); coords[1] = (float) (y + ctrls[5] * h); if (transform != null) { transform.transform(coords, 0, coords, 0, 1); } return SEG_MOVETO; } double ctrls[] = ctrlpts[index - 1]; coords[0] = (float) (x + ctrls[0] * w); coords[1] = (float) (y + ctrls[1] * h); coords[2] = (float) (x + ctrls[2] * w); coords[3] = (float) (y + ctrls[3] * h); coords[4] = (float) (x + ctrls[4] * w); coords[5] = (float) (y + ctrls[5] * h); if (transform != null) { transform.transform(coords, 0, coords, 0, 3); } return SEG_CUBICTO; } }