bitmapobject.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 "BitmapObject.h"

BitmapObject::BitmapObject(Bitmap *bmp) {
	bitmap = bmp;
}

BitmapObject::~BitmapObject(void) {
}

void BitmapObject::drawSelf(ViewPort *vp, FRECT *rect) {
	FRECT dstfrect, bounds;
	RECT srcrect;

	getBounds(&bounds);

	if (!intersectsFRECT(rect, &bounds)) {
		return;		// Nothing to draw, the code below assumes that rect and bounds overlap!
	}
	intersectFRECT(&dstfrect, rect, &bounds);

	srcrect.left = (int)((dstfrect.left - bounds.left) / (bounds.right - bounds.left) * bitmap->getWidth());
	srcrect.top = (int)((dstfrect.top - bounds.top) / (bounds.bottom - bounds.top) * bitmap->getHeight());
	srcrect.right = (int)((dstfrect.right - bounds.left) / (bounds.right - bounds.left) * bitmap->getWidth());
	srcrect.bottom = (int)((dstfrect.bottom - bounds.top) / (bounds.bottom - bounds.top) * bitmap->getHeight());

	vp->drawBitmap(bitmap, &dstfrect, &srcrect);
}

void BitmapObject::getBounds(FRECT *rect) {
	// The bitmap covers all of the canvas
	float aspect = (float)bitmap->getHeight() / (float)bitmap->getWidth();
	if (aspect < 1.0f) {
		rect->left = 0.0f;
		rect->top = 0.5f - aspect / 2.0f;
		rect->right = 1.0f;
		rect->bottom = 0.5f + aspect / 2.0f;
	} else {
		aspect = 1.0f / aspect;
		rect->left = 0.5f - aspect / 2.0f;
		rect->top = 0.0f;
		rect->right = 0.5f + aspect / 2.0f;
		rect->bottom = 1.0f;
	}
}

void BitmapObject::getPixelBounds(RECT *rect) {
	if (rect != NULL) {
		rect->left = rect->top = 0;
		rect->right = bitmap->getWidth();
		rect->bottom = bitmap->getHeight();
	}
}