/*
* File : Scale.java
* Created : 15 d�c. 2003}
* By : Olivier
*
* Azureus - a Java Bittorrent client
*
* 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.
*
* 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 ( see the LICENSE file ).
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package org.gudy.azureus2.ui.swt.components.graphics;
/**
* @author Olivier
*
*/
public class Scale {
//The target number of pixels per scale level
private int pixelsPerLevel = 50;
//The max value
private int max = 1;
//The displayed number of levels
private int nbLevels;
//The computed (dislayed max)
private int displayedMax;
//The number of pixels
private int nbPixels = 1;
int scaleFactor;
int powFactor;
public void setMax(int max) {
this.max = max;
if(max < 1)
max = 1;
computeValues();
}
public int getMax() {
return this.max;
}
public void setNbPixels(int nbPixels) {
this.nbPixels = nbPixels;
if(nbPixels < 1)
nbPixels = 1;
computeValues();
}
private void computeValues() {
int targetNbLevels = nbPixels / pixelsPerLevel;
if(targetNbLevels < 1)
targetNbLevels = 1;
scaleFactor = max / targetNbLevels;
powFactor = 1;
while(scaleFactor >= 10) {
powFactor = 10 * powFactor;
scaleFactor = scaleFactor / 10;
}
if(scaleFactor >= 5)
scaleFactor = 5;
else if(scaleFactor >= 2)
scaleFactor = 2;
else
scaleFactor = 1;
nbLevels = max / (scaleFactor * powFactor) + 1;
displayedMax = scaleFactor * powFactor * nbLevels;
}
public int[] getScaleValues() {
int[] result = new int[nbLevels+1];
for(int i = 0 ; i < nbLevels + 1 ; i++) {
result[i] = i * scaleFactor * powFactor;
}
return result;
}
public int getScaledValue(int value) {
return(int)( ((long)value * nbPixels) / displayedMax );
}
}