zoomtool.cpp

swain-0.5.2.zip的源代码,比较好用,希望大家喜欢.

/*
This file is part of SWAIN (http://sourceforge.net/projects/swain).
Copyright (C) 2006  Daniel Lindstr鰉 and Daniel Nilsson

This program 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.

This program is distributed in the hope that it will be useful,
but 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.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA  02110-1301, USA.
*/
#include "StdAfx.h"
#include "ZoomTool.h"
#include "PacketBounds.h"

// How much to zoom when the pointer is moved across the screen in each direction
const float ZOOM_FACTOR_X = 4.0f;
const float ZOOM_FACTOR_Y = -4.0f;

ZoomTool::ZoomTool(ViewPort *vp, ConnectionHandler *ch, int cid) {
	this->viewport = vp;
	this->connhand = ch;
	this->cid = cid;
	this->followme = false;
}

ZoomTool::~ZoomTool(void) {
}

void ZoomTool::mouseDown(FPOINT *point) {
	transformPoint(point, &downpoint);
	viewport->getPan(&origin);
	startzoom = viewport->getZoom();

	FRECT rect;
	viewport->getBounds(&rect);
	PacketBounds *pb = new PacketBounds(rect, followme);
	pb->setCId(cid);
	connhand->sendPacket(pb);
}

void ZoomTool::mouseUp(FPOINT *point) {
}

void ZoomTool::mouseDragged(FPOINT *point) {
	FPOINT pt;
	transformPoint(point, &pt);
	float zoom = startzoom +
		ZOOM_FACTOR_X * (pt.x - downpoint.x) +
		ZOOM_FACTOR_Y * (pt.y - downpoint.y);
	zoom = min(zoom, viewport->getMaxZoom());
	zoom = max(zoom, viewport->getMinZoom());
	FPOINT pan = {
		origin.x + (downpoint.x/startzoom - downpoint.x/zoom),
		origin.y + (downpoint.y/startzoom - downpoint.y/zoom)
	};
	viewport->setZoomPan(zoom, &pan);

	FRECT rect;
	viewport->getBounds(&rect);
	PacketBounds *pb = new PacketBounds(rect, followme);
	pb->setCId(cid);
	connhand->sendPacket(pb);
}

void ZoomTool::setFollowMe(bool followme){
	this->followme = followme;
}