83 lines
3.2 KiB
PHP
83 lines
3.2 KiB
PHP
<?php defined('SYSPATH') or die('No direct script access.');
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/*************************************************************************
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* Copyright (C) 2012 Michel A. Mayer *
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* *
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* This program is free software: you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation, either version 3 of the License, or *
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* (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, see <http://www.gnu.org/licenses/>. *
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*************************************************************************/
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class Emboss_Overlay_Model_Core extends ORM {
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protected $sorting = array('width' => 'desc', 'height' => 'desc');
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public function score($W,$H,$function)
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{
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/*************************************************************
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* (W,H) = Image (Width,Height)
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* (w,h) = Overlay (width,height)
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*************************************************************/
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$w = $this->width;
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$h = $this->height;
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if( ($w>$W) || ($h>$H) ) { return 0; }
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/*************************************************************
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* Minimize Margin Method
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*************************************************************
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* Score = (W^2 + H^2) - ((W-w)^2 + (H-h)^2)
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* = (W^2 - (W-w)^2) + (H^2 - (H-h)^2)
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* = (2Ww - w^2) + (2Hh - h^2)
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* = (2W-w)w + (2H-h)h
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*************************************************************/
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if($function == 'margin') {
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$score = ( (2*$W - $w)*$w + (2*$H - $h)*$h );
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}
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/*************************************************************
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* Aspect Ratio Weighted
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*************************************************************
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* if h < w*(H/W)
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* peak value = area on diagonal (w*h)
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* null value = 0 on w axis (h=0)
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* quadratic fit between:
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* Score = W/H h^2
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* if w < h*(W/H)
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* Score = H/W w^2 (by symmetry)
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*************************************************************/
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else if($function == 'diag') {
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if($h*$W < $w*$H) {
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$score = $h*$h*($W/$H);
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} else {
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$score = $w*$w*($H/$W);
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}
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}
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/*************************************************************
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* Area Method (Default if no match to $function)
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*************************************************************
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* Score = w * h
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*************************************************************/
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else {
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$score = $w * $h;
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}
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return $score;
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}
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public function area()
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{
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return $this->width * $this->height;
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}
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} |