ParallelLineGraphic.java

/*******************************************************************************
 * Copyright (c) 2016 Weasis Team and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Nicolas Roduit - initial API and implementation
 *******************************************************************************/
package org.weasis.core.ui.model.graphic.imp.line;

import java.awt.Shape;
import java.awt.geom.AffineTransform;
import java.awt.geom.Line2D;
import java.awt.geom.Path2D;
import java.awt.geom.Point2D;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Objects;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

import org.weasis.core.api.gui.util.GeomUtil;
import org.weasis.core.api.gui.util.MathUtil;
import org.weasis.core.api.image.measure.MeasurementsAdapter;
import org.weasis.core.api.image.util.MeasurableLayer;
import org.weasis.core.api.image.util.Unit;
import org.weasis.core.ui.Messages;
import org.weasis.core.ui.model.graphic.AbstractDragGraphic;
import org.weasis.core.ui.model.utils.bean.MeasureItem;
import org.weasis.core.ui.model.utils.bean.Measurement;
import org.weasis.core.ui.model.utils.exceptions.InvalidShapeException;
import org.weasis.core.ui.util.MouseEventDouble;

@XmlType(name = "parallelLine")
@XmlRootElement(name = "parallelLine")
public class ParallelLineGraphic extends AbstractDragGraphic {
    private static final long serialVersionUID = -3254108307003667982L;

    public static final Integer POINTS_NUMBER = 6;

    public static final Icon ICON =
        new ImageIcon(ParallelLineGraphic.class.getResource("/icon/22x22/draw-parallel.png")); //$NON-NLS-1$

    public static final Measurement DISTANCE =
        new Measurement(Messages.getString("measure.distance"), 1, true, true, true); //$NON-NLS-1$
    public static final Measurement ORIENTATION =
        new Measurement(Messages.getString("measure.orientation"), 2, true, true, false); //$NON-NLS-1$
    public static final Measurement AZIMUTH =
        new Measurement(Messages.getString("measure.azimuth"), 3, true, true, false); //$NON-NLS-1$

    protected static final List<Measurement> MEASUREMENT_LIST = new ArrayList<>();
    static {
        MEASUREMENT_LIST.add(DISTANCE);
        MEASUREMENT_LIST.add(ORIENTATION);
        MEASUREMENT_LIST.add(AZIMUTH);
    }

    // Let AB & CD two parallel line segments
    protected Point2D.Double ptA;
    protected Point2D.Double ptB;
    protected Point2D.Double ptC;
    protected Point2D.Double ptD;

    // Let E,F middle points of AB & CD
    protected Point2D.Double ptE;
    protected Point2D.Double ptF;

    // estimate if line segments are valid or not
    protected Boolean lineABvalid;
    protected Boolean lineCDvalid;

    public ParallelLineGraphic() {
        super(POINTS_NUMBER);
    }

    public ParallelLineGraphic(ParallelLineGraphic graphic) {
        super(graphic);
    }

    @Override
    public ParallelLineGraphic copy() {
        return new ParallelLineGraphic(this);
    }

    @Override
    public Icon getIcon() {
        return ICON;
    }

    @Override
    public String getUIName() {
        return Messages.getString("measure.parallel"); //$NON-NLS-1$
    }

    @Override
    protected void prepareShape() throws InvalidShapeException {
        if (!isShapeValid()) {
            throw new InvalidShapeException("This shape cannot be drawn"); //$NON-NLS-1$
        }
        buildShape(null);
    }

    @Override
    public Integer moveAndResizeOnDrawing(Integer handlePointIndex, Double deltaX, Double deltaY,
        MouseEventDouble mouseEvent) {

        handlePointIndex = super.moveAndResizeOnDrawing(handlePointIndex, deltaX, deltaY, mouseEvent);

        if (handlePointIndex >= 0 && handlePointIndex < getHandlePointListSize()) {
            updateTool();

            if (lineABvalid && lineCDvalid) {

                if (handlePointIndex == 0 || handlePointIndex == 1) {
                    // drag point is A or B

                    Point2D anchor = (handlePointIndex == 0) ? ptB : ptA;
                    double theta =
                        GeomUtil.getSmallestAngleRad(GeomUtil.getAngleRad(ptC, ptD) - GeomUtil.getAngleRad(ptA, ptB));

                    // rotation angle around anchor point
                    AffineTransform rotate = AffineTransform.getRotateInstance(theta, anchor.getX(), anchor.getY());

                    rotate.transform(ptC, ptC);
                    rotate.transform(ptD, ptD);

                    setHandlePoint(2, ptC);
                    setHandlePoint(3, ptD);

                } else if (handlePointIndex == 2 || handlePointIndex == 3) {
                    // drag point is C or D

                    Point2D.Double pt1 = (handlePointIndex == 2) ? ptC : ptD;
                    Point2D.Double pt2 = (handlePointIndex == 2) ? ptD : ptC;
                    int hIndex = (handlePointIndex == 2) ? 3 : 2;

                    Point2D ptI = GeomUtil.getPerpendicularPointToLine(ptA, ptB, pt1);
                    Point2D ptJ = GeomUtil.getPerpendicularPointToLine(ptA, ptB, pt2);

                    double transX = (pt1.getX() - ptI.getX()) - (pt2.getX() - ptJ.getX());
                    double transY = (pt1.getY() - ptI.getY()) - (pt2.getY() - ptJ.getY());

                    AffineTransform translate = AffineTransform.getTranslateInstance(transX, transY);
                    translate.transform(pt2, pt2);

                    setHandlePoint(hIndex, pt2);

                } else if (handlePointIndex == 4 || handlePointIndex == 5) {
                    // drag point is E middle of AB or F middle of CD
                    Point2D.Double pt0 = (handlePointIndex == 4) ? ptE : ptF;
                    Point2D.Double pt1 = (handlePointIndex == 4) ? ptA : ptC;
                    Point2D.Double pt2 = (handlePointIndex == 4) ? ptB : ptD;
                    int hIndex1 = (handlePointIndex == 4) ? 0 : 2;
                    int hIndex2 = (handlePointIndex == 4) ? 1 : 3;

                    if (Objects.nonNull(pt0)) {
                        Point2D ptI = GeomUtil.getPerpendicularPointToLine(pt1, pt2, pt0);

                        AffineTransform translate =
                            AffineTransform.getTranslateInstance(pt0.getX() - ptI.getX(), pt0.getY() - ptI.getY());
                        translate.transform(pt1, pt1);
                        translate.transform(pt2, pt2);

                        setHandlePoint(hIndex1, pt1);
                        setHandlePoint(hIndex2, pt2);
                    }
                }

                setHandlePoint(4, GeomUtil.getMidPoint(ptA, ptB));
                setHandlePoint(5, GeomUtil.getMidPoint(ptC, ptD));
            }
        }
        return handlePointIndex;
    }

    @Override
    public void buildShape(MouseEventDouble mouseEvent) {

        updateTool();

        Shape newShape = null;
        Path2D path = new Path2D.Double(Path2D.WIND_NON_ZERO, 2);

        if (lineABvalid) {
            path.append(new Line2D.Double(ptA, ptB), false);
        }

        if (lineCDvalid) {
            path.append(new Line2D.Double(ptC, ptD), false);
        }

        if (path.getCurrentPoint() != null) {
            newShape = path;
        }

        setShape(newShape, mouseEvent);
        updateLabel(mouseEvent, getDefaultView2d(mouseEvent));
    }

    @Override
    public List<MeasureItem> computeMeasurements(MeasurableLayer layer, boolean releaseEvent, Unit displayUnit) {

        if (layer != null && layer.hasContent() && isShapeValid()) {
            MeasurementsAdapter adapter = layer.getMeasurementAdapter(displayUnit);

            if (adapter != null) {
                ArrayList<MeasureItem> measVal = new ArrayList<>(3);

                if (DISTANCE.getComputed()) {
                    Double val =
                        ptC.distance(GeomUtil.getPerpendicularPointToLine(ptA, ptB, ptC)) * adapter.getCalibRatio();
                    measVal.add(new MeasureItem(DISTANCE, val, adapter.getUnit()));
                }
                if (ORIENTATION.getComputed()) {
                    measVal.add(new MeasureItem(ORIENTATION, MathUtil.getOrientation(ptA, ptB),
                        Messages.getString("measure.deg"))); //$NON-NLS-1$
                }
                if (AZIMUTH.getComputed()) {
                    measVal.add(
                        new MeasureItem(AZIMUTH, MathUtil.getAzimuth(ptA, ptB), Messages.getString("measure.deg"))); //$NON-NLS-1$
                }
                return measVal;
            }
        }
        return Collections.emptyList();
    }

    @Override
    public boolean isShapeValid() {
        updateTool();
        return lineABvalid && lineCDvalid;
    }

    // /////////////////////////////////////////////////////////////////////////////////////////////////////

    protected void updateTool() {
        ptA = getHandlePoint(0);
        ptB = getHandlePoint(1);
        ptC = getHandlePoint(2);
        ptD = getHandlePoint(3);
        ptE = getHandlePoint(4);
        ptF = getHandlePoint(5);

        lineABvalid = ptA != null && ptB != null && !ptB.equals(ptA);
        lineCDvalid = ptC != null && ptD != null && !ptC.equals(ptD);
    }

    @Override
    public List<Measurement> getMeasurementList() {
        return MEASUREMENT_LIST;
    }
}