PSTFreeHandView.java

/*
 * This file is part of LaTeXDraw.
 * Copyright (c) 2005-2017 Arnaud BLOUIN
 * LaTeXDraw is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License as published by the Free Software
 * Foundation; either version 2 of the License, or (at your option) any later version.
 * LaTeXDraw is distributed without any warranty; without even the implied
 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 */
package net.sf.latexdraw.view.pst;

import java.util.List;
import net.sf.latexdraw.models.MathUtils;
import net.sf.latexdraw.models.interfaces.shape.IFreehand;
import net.sf.latexdraw.models.interfaces.shape.IPoint;
import org.eclipse.jdt.annotation.NonNull;

/**
 * Defines a PSTricks view of the LFreeHand model.
 * @author Arnaud Blouin
 */
public class PSTFreeHandView extends PSTClassicalView<IFreehand> {
	/**
	 * Creates and initialises a LFreeHand PSTricks view.
	 * @param model The model to view.
	 * @throws IllegalArgumentException If the given model is not valid.
	 * @since 3.0
	 */
	protected PSTFreeHandView(final @NonNull IFreehand model) {
		super(model);
	}


	/**
	 * Updates the cache with the code of the freehand shape having the Curve style.
	 */
	protected void updateCacheCurve(final StringBuilder coord, final double originx, final double originy, final double ppc) {
		final List<IPoint> pts = shape.getPoints();
		int i;
		final int size = shape.getNbPoints();
		final int interval = shape.getInterval();
		float prevx;
		float prevy;
		float curx = (float) pts.get(0).getX();
		float cury = (float) pts.get(0).getY();
		float midx = 0f;
		float midy = 0f;

		coord.append("\\moveto(").append(MathUtils.INST.getCutNumberFloat(((curx - originx) / ppc)));//$NON-NLS-1$
		coord.append(',').append(MathUtils.INST.getCutNumberFloat((originy - cury) / ppc)).append(')').append('\n');

		if(pts.size() > interval) {
			prevx = curx;
			prevy = cury;
			curx = (float) pts.get(interval).getX();
			cury = (float) pts.get(interval).getY();
			midx = (curx + prevx) / 2.0f;
			midy = (cury + prevy) / 2.0f;

			coord.append("\\lineto(").append(MathUtils.INST.getCutNumberFloat(((midx - originx) / ppc)));//$NON-NLS-1$
			coord.append(',').append(MathUtils.INST.getCutNumberFloat((originy - midy) / ppc)).append(')').append('\n');
		}

		for(i = interval * 2; i < size; i += interval) {
			final float x1 = (midx + curx) / 2.0f;
			final float y1 = (midy + cury) / 2.0f;
			prevx = curx;
			prevy = cury;
			curx = (float) pts.get(i).getX();
			cury = (float) pts.get(i).getY();
			midx = (curx + prevx) / 2.0f;
			midy = (cury + prevy) / 2.0f;
			final float x2 = (prevx + midx) / 2.0f;
			final float y2 = (prevy + midy) / 2.0f;

			coord.append("\\curveto(").append(MathUtils.INST.getCutNumberFloat((x1 - originx) / ppc));//$NON-NLS-1$
			coord.append(',').append(MathUtils.INST.getCutNumberFloat((originy - y1) / ppc)).append(')').append('(');
			coord.append(MathUtils.INST.getCutNumberFloat((x2 - originx) / ppc)).append(',');
			coord.append(MathUtils.INST.getCutNumberFloat((originy - y2) / ppc)).append(')').append('(');
			coord.append(MathUtils.INST.getCutNumberFloat((midx - originx) / ppc)).append(',');
			coord.append(MathUtils.INST.getCutNumberFloat((originy - midy) / ppc)).append(')').append('\n');
		}

		if(i - interval + 1 < size) {
			final float x1 = (midx + curx) / 2.0f;
			final float y1 = (midy + cury) / 2.0f;
			prevx = curx;
			prevy = cury;
			curx = (float) pts.get(pts.size() - 1).getX();
			cury = (float) pts.get(pts.size() - 1).getY();
			midx = (curx + prevx) / 2.0f;
			midy = (cury + prevy) / 2.0f;
			final float x2 = (prevx + midx) / 2.0f;
			final float y2 = (prevy + midy) / 2.0f;

			coord.append("\\curveto("); //$NON-NLS-1$
			coord.append(MathUtils.INST.getCutNumberFloat((x1 - originx) / ppc)).append(',');
			coord.append(MathUtils.INST.getCutNumberFloat((originy - y1) / ppc)).append(')').append('(');
			coord.append(MathUtils.INST.getCutNumberFloat((x2 - originx) / ppc)).append(',');
			coord.append(MathUtils.INST.getCutNumberFloat((originy - y2) / ppc)).append(')').append('(');
			coord.append(MathUtils.INST.getCutNumberFloat((pts.get(pts.size() - 1).getX() - originx) / ppc)).append(',');
			coord.append(MathUtils.INST.getCutNumberFloat((originy - pts.get(pts.size() - 1).getY()) / ppc)).append(')').append('\n');
		}
	}


	/**
	 * Updates the cache with the code of the freehand shape having the Line style.
	 */
	protected void updateCacheLines(final StringBuilder coord, final double originx, final double originy, final double ppc) {
		final List<IPoint> pts = shape.getPoints();
		IPoint p = pts.get(0);
		int i;
		final int size = shape.getNbPoints();
		final int interval = shape.getInterval();

		coord.append("\\moveto(").append(MathUtils.INST.getCutNumberFloat((p.getX() - originx) / ppc));//$NON-NLS-1$
		coord.append(',').append(MathUtils.INST.getCutNumberFloat((originy - p.getY()) / ppc)).append(')').append('\n');

		for(i = interval; i < size; i += interval) {
			p = pts.get(i);
			coord.append("\\lineto(").append(MathUtils.INST.getCutNumberFloat((p.getX() - originx) / ppc));//$NON-NLS-1$
			coord.append(',').append(MathUtils.INST.getCutNumberFloat((originy - p.getY()) / ppc)).append(')').append('\n');
		}

		if(i - interval < size)
			coord.append("\\lineto(").append(MathUtils.INST.getCutNumberFloat((pts.get(pts.size() - 1).getX() - originx) / ppc)).append(//$NON-NLS-1$
				',').append(MathUtils.INST.getCutNumberFloat((originy - pts.get(pts.size() - 1).getY()) / ppc)).append(')').append('\n');

	}


	@Override
	public String getCode(final IPoint origin, final float ppc) {
		if(!MathUtils.INST.isValidPt(origin) || ppc < 1 || shape.getNbPoints() < 2) return "";

		final StringBuilder coord = new StringBuilder();
		final StringBuilder rot = getRotationHeaderCode(ppc, origin);
		final StringBuilder code = new StringBuilder();

		switch(shape.getType()) {
			case CURVES:
				updateCacheCurve(coord, origin.getX(), origin.getY(), ppc);
				break;
			case LINES:
				updateCacheLines(coord, origin.getX(), origin.getY(), ppc);
				break;
		}

		if(rot != null) code.append(rot);

		code.append("\\pscustom[");//$NON-NLS-1$
		code.append(getPropertiesCode(ppc));
		code.append("]\n{\n\\newpath\n");//$NON-NLS-1$
		code.append(coord);
		code.append(shape.isOpen() ? "" : "\\closepath");//$NON-NLS-1$//$NON-NLS-2$
		code.append(shape.hasShadow() ? "\\openshadow\n" : "");//$NON-NLS-1$//$NON-NLS-2$
		code.append('}');

		if(rot != null) code.append('}');

		return code.toString();
	}
}