scale.java

java 文件下载器。可自定义

// Decompiled by Jad v1.5.8e2. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://kpdus.tripod.com/jad.html
// Decompiler options: packimports(3) fieldsfirst ansi space 
// Source File Name:   Scale.java

package org.gudy.azureus2.ui.swt.components.graphics;


public class Scale
{

	private int pixelsPerLevel;
	private int max;
	private int nbLevels;
	private int displayedMax;
	private int nbPixels;
	int scaleFactor;
	int powFactor;

	public Scale()
	{
		pixelsPerLevel = 50;
		max = 1;
		nbPixels = 1;
	}

	public void setMax(int max)
	{
		this.max = max;
		if (max < 1)
			max = 1;
		computeValues();
	}

	public int getMax()
	{
		return 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;
		for (; scaleFactor >= 10; scaleFactor = scaleFactor / 10)
			powFactor = 10 * powFactor;

		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 * (long)nbPixels) / (long)displayedMax);
	}
}