arrowobject.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 "ArrowObject.h"

static const FPOINT static_arrow[] = {{0,0}, {-1,-1}, {-1, -0.5}, {-2, -0.5}, {-2, 0.5}, {-1, 0.5}, {-1, 1}};
static const int NUM_POINTS = sizeof(static_arrow) / sizeof(static_arrow[0]);
static const float ARROW_SCALE = 0.03f;
static const float DRAG_FACTOR = ARROW_SCALE * 1.0f;

ArrowObject::ArrowObject(ObjectManager *om, ViewPort *vp, FPOINT *p)
{
	this->om = om;
	this->vp = vp;
	this->pos.x = p->x;
	this->pos.y = p->y;
	this->oldpos = this->pos;
	this->rotvec[0].x = 1;
	this->rotvec[0].y = 0;
	this->rotvec[1].x = 0;
	this->rotvec[1].y = 1;
	this->oldvec.x = 0;
	this->oldvec.y = 0;
}

ArrowObject::~ArrowObject(void)
{
} 


void ArrowObject::drawSelf(ViewPort *vp, FRECT *rect) {
	FPOINT arrow[NUM_POINTS];
	this->calcArrow(arrow);
	vp->drawPolygon(arrow, NUM_POINTS);
}

void ArrowObject::getBounds(FRECT *rect){
	FPOINT arrow[NUM_POINTS];
	this->calcArrow(arrow);

	rect->top = rect->bottom = arrow[0].y;
	rect->right = rect->left = arrow[0].x;
	for(int i = 1; i < NUM_POINTS; i++) {
		addPoint2Bound(&arrow[i], rect);
	}
	vp->expandBoundsHack(rect);
}

void ArrowObject::setPoint(FPOINT *p){

	FRECT temp;
	this->getBounds(&temp);

	pos = *p;

	FPOINT vec = {pos.x - oldpos.x, pos.y - oldpos.y};
	vec.x += oldvec.x * DRAG_FACTOR / vp->getZoom();
	vec.y += oldvec.y * DRAG_FACTOR / vp->getZoom();

	float len = (float)sqrt(pow(vec.x, 2) + pow(vec.y, 2));
	vec.x = (vec.x / len);
	vec.y = (vec.y / len);

	rotvec[0].x = vec.x;
	rotvec[0].y = -vec.y;
	rotvec[1].x = vec.y;
	rotvec[1].y = vec.x;

	this->oldvec = vec;
	oldpos = pos;
	om->objectMoved(this, &temp);
}

void ArrowObject::calcArrow(FPOINT *arrow){
	for(int i = 0; i < NUM_POINTS; i++){
		arrow[i].x = static_arrow[i].x*rotvec[0].x+static_arrow[i].y*rotvec[0].y;
		arrow[i].y = static_arrow[i].x*rotvec[1].x+static_arrow[i].y*rotvec[1].y;

		arrow[i].x *= ARROW_SCALE / vp->getZoom();
		arrow[i].y *= ARROW_SCALE / vp->getZoom();

		arrow[i].x += pos.x;
		arrow[i].y += pos.y;
	}
}