coordinatetransform.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:   CoordinateTransform.java

package org.gudy.azureus2.ui.swt.views.utils;

import org.eclipse.swt.graphics.Rectangle;

public class CoordinateTransform
{

	final int extWidth;
	final int extHeight;
	int offsetX;
	int offsetY;
	double scaleX;
	double scaleY;

	public CoordinateTransform(Rectangle exteriorBounds)
	{
		offsetX = 0;
		offsetY = 0;
		scaleX = 1.0D;
		scaleY = 1.0D;
		extWidth = exteriorBounds.width;
		extHeight = exteriorBounds.height;
	}

	public int x(int x)
	{
		return (int)Math.round((double)offsetX + (double)x * scaleX);
	}

	public int y(int y)
	{
		return (int)Math.round((double)offsetY + (double)y * scaleY);
	}

	private int w(int w)
	{
		return (int)Math.round((double)w * scaleX);
	}

	private int h(int h)
	{
		return (int)Math.ceil((double)h * scaleY);
	}

	public void scale(double x, double y)
	{
		scaleX *= x;
		scaleY *= y;
	}

	public void shiftExternal(int x, int y)
	{
		offsetX += x;
		offsetY += y;
	}

	public void shiftInternal(int x, int y)
	{
		offsetX += (double)x * scaleX;
		offsetY += (double)y * scaleY;
	}

	private void calcFromDimensions(int internalWidth, int internalHeight, int marginLeft, int marginRight, int marginTop, int marginBottom, boolean leftToRight, 
			boolean topDown)
	{
		shiftExternal(leftToRight ? 0 : extWidth, topDown ? 0 : extHeight);
		scale(leftToRight ? 1.0D : -1D, topDown ? 1.0D : -1D);
		shiftInternal(leftToRight ? marginLeft : marginRight, topDown ? marginTop : marginBottom);
		scale(Math.round((double)(extWidth - marginLeft - marginRight) / (1.0D * (double)internalWidth)), Math.round((double)(extHeight - marginTop - marginBottom) / (1.0D * (double)internalHeight)));
	}
}