pythagoras/src/main/java/pythagoras/d/CubicCurve.java

//
// Pythagoras - a collection of geometry classes
// http://github.com/samskivert/pythagoras

package pythagoras.d;

import java.io.Serializable;

/**
 * Represents a cubic curve.
 */
public class CubicCurve extends AbstractCubicCurve implements Serializable
{
	private static final long serialVersionUID = 1344542230356205271L;

	/** The x-coordinate of the start of this curve. */
    public double x1;

    /** The y-coordinate of the start of this curve. */
    public double y1;

    /** The x-coordinate of the first control point. */
    public double ctrlx1;

    /** The y-coordinate of the first control point. */
    public double ctrly1;

    /** The x-coordinate of the second control point. */
    public double ctrlx2;

    /** The x-coordinate of the second control point. */
    public double ctrly2;

    /** The x-coordinate of the end of this curve. */
    public double x2;

    /** The y-coordinate of the end of this curve. */
    public double y2;

    /**
     * Creates a cubic curve with all points at (0,0).
     */
    public CubicCurve () {
    }

    /**
     * Creates a cubic curve with the specified start, control, and end points.
     */
    public CubicCurve (double x1, double y1, double ctrlx1, double ctrly1,
                       double ctrlx2, double ctrly2, double x2, double y2) {
        setCurve(x1, y1, ctrlx1, ctrly1, ctrlx2, ctrly2, x2, y2);
    }

    /**
     * Configures the start, control and end points for this curve.
     */
    public void setCurve (double x1, double y1, double ctrlx1, double ctrly1, double ctrlx2,
                          double ctrly2, double x2, double y2) {
        this.x1 = x1;
        this.y1 = y1;
        this.ctrlx1 = ctrlx1;
        this.ctrly1 = ctrly1;
        this.ctrlx2 = ctrlx2;
        this.ctrly2 = ctrly2;
        this.x2 = x2;
        this.y2 = y2;
    }

    /**
     * Configures the start, control and end points for this curve.
     */
    public void setCurve (XY p1, XY cp1, XY cp2, XY p2) {
        setCurve(p1.x(), p1.y(), cp1.x(), cp1.y(),
                 cp2.x(), cp2.y(), p2.x(), p2.y());
    }

    /**
     * Configures the start, control and end points for this curve, using the values at the
     * specified offset in the {@code coords} array.
     */
    public void setCurve (double[] coords, int offset) {
        setCurve(coords[offset + 0], coords[offset + 1], coords[offset + 2], coords[offset + 3],
                 coords[offset + 4], coords[offset + 5], coords[offset + 6], coords[offset + 7]);
    }

    /**
     * Configures the start, control and end points for this curve, using the values at the
     * specified offset in the {@code points} array.
     */
    public void setCurve (XY[] points, int offset) {
        setCurve(points[offset + 0].x(), points[offset + 0].y(),
                 points[offset + 1].x(), points[offset + 1].y(),
                 points[offset + 2].x(), points[offset + 2].y(),
                 points[offset + 3].x(), points[offset + 3].y());
    }

    /**
     * Configures the start, control and end points for this curve to be the same as the supplied
     * curve.
     */
    public void setCurve (ICubicCurve curve) {
        setCurve(curve.x1(), curve.y1(), curve.ctrlX1(), curve.ctrlY1(),
                 curve.ctrlX2(), curve.ctrlY2(), curve.x2(), curve.y2());
    }

    @Override // from interface ICubicCurve
    public double x1 () {
        return x1;
    }

    @Override // from interface ICubicCurve
    public double y1 () {
        return y1;
    }

    @Override // from interface ICubicCurve
    public double ctrlX1 () {
        return ctrlx1;
    }

    @Override // from interface ICubicCurve
    public double ctrlY1 () {
        return ctrly1;
    }

    @Override // from interface ICubicCurve
    public double ctrlX2 () {
        return ctrlx2;
    }

    @Override // from interface ICubicCurve
    public double ctrlY2 () {
        return ctrly2;
    }

    @Override // from interface ICubicCurve
    public double x2 () {
        return x2;
    }

    @Override // from interface ICubicCurve
    public double y2 () {
        return y2;
    }
}