root / trunk / libraries / libCq_CMS_praster / src / org / cresques / ui / cmd / CmdZoom.java @ 8026
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/*
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* Cresques Mapping Suite. Graphic Library for constructing mapping applications.
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*
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* Copyright (C) 2004-5.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,USA.
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*
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* For more information, contact:
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*
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* cresques@gmail.com
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*/
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package org.cresques.ui.cmd; |
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import org.cresques.px.Extent; |
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import org.cresques.ui.CQCursor; |
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import org.cresques.ui.CQMapCanvas; |
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import java.awt.event.MouseEvent; |
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import java.awt.geom.Point2D; |
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/**
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* Comando zoom.
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* A?ade al canvas la capacidad de aumentar y disminuir la vista.
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* @author "Luis W. Sevilla" <sevilla_lui@gva.es>
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*/
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public class CmdZoom extends Cmd { |
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public double aumenta = 2.0; |
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public double reduce = .5; |
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private Point2D ptIni = null; |
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/**
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* Construye un nuevo CmdZoom para el Canvas
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* @param canvas
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*/
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public CmdZoom(CQMapCanvas canvas) {
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super(canvas);
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eventsWanted = (LEFT | RIGHT | PRESS | RELEASE | DRAG); |
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cursor = CQCursor.getCursor(CQCursor.ZOOMIN_CURSOR); |
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} |
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/**
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* Recibe los eventos del rat?n.
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*/
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public void cmd(Point2D pt, int bt, int mouseEvent) { |
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//System.out.println("Zoom: Evento = "+ mouseEvent);
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if (mouseEvent == PRESS) {
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ptIni = pt; |
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} else if (mouseEvent == RELEASE) { |
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if (pt.getX() != ptIni.getX()) {
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zoomBox(new Extent(ptIni, pt));
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} else if (bt == MouseEvent.BUTTON1) { |
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zoomMas(pt); |
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} else if (bt == MouseEvent.BUTTON3) { |
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zoomMenos(pt); |
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} |
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} |
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} |
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/**
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* Realiza un zoom de aumento, centrado en el Point2D;
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* @param pt
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*/
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public void zoomMas(Point2D pt) { |
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canvas.getVPData().zoom(aumenta, pt); |
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canvas.viewPortChanged(); |
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canvas.repaint(); |
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} |
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/**
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* Realiza un zoom de disminuci?n, centrado en el Point2D;
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* @param pt
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*/
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public void zoomMenos(Point2D pt) { |
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canvas.getVPData().zoom(reduce, pt); |
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canvas.viewPortChanged(); |
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canvas.repaint(); |
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} |
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/**
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* Realiza un zoom que abarque el Extent;
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* @param box
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*/
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public void zoomBox(Extent box) { |
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canvas.getVPData().zoom(box); |
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canvas.viewPortChanged(); |
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canvas.repaint(); |
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} |
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} |