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/**
* Copyright (c) 2004 - 2010 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Andre Dietisheim - initial API and implementation
*/
package org.eclipse.emf.cdo.ui.internal.branch.geometry;
import org.eclipse.zest.layouts.dataStructures.DisplayIndependentDimension;
import org.eclipse.zest.layouts.dataStructures.DisplayIndependentRectangle;
/**
* Holds various utiliy method that help to deal with gemoetry classes in zest .
*/
public class GeometryUtils
{
/**
* Adds the width and height of the given second (source) dimension to the given first (target) dimension .
*
* @param targetDimension
* the this dimension
* @param sourceDimension
* the that dimension
*/
public static void union(DisplayIndependentDimension targetDimension, DisplayIndependentDimension sourceDimension)
{
targetDimension.width += sourceDimension.width;
targetDimension.height += sourceDimension.height;
}
/**
* Moves the given Rectangle horizontally by xOffset and vertically by yOffset and returns a new translated rectangle
* instance.
*
* @param xOffset
* the offset on the x axis to move the rectangle
* @param yOffset
* the offset on the y axis to move the rectangle
* @param rectangle
* the rectangle to translate
* @return a new translated rectangle instance
*/
public static DisplayIndependentRectangle translateRectangle(double xOffset, double yOffset,
DisplayIndependentRectangle rectangle)
{
DisplayIndependentRectangle newRectangle = new DisplayIndependentRectangle(rectangle);
newRectangle.x += xOffset;
newRectangle.y += yOffset;
return newRectangle;
}
/**
* Moves the given Rectangle horizontally and vertically by the the offsets indicated in the translation and returns a
* new translated rectangle instance.
*
* @param rectangle
* the rectangle to translate
* @param translation
* the translation with the offsets on the x- and y-axis
* @return a new translated rectangle instance
*/
public static DisplayIndependentRectangle translateRectangle(DisplayIndependentDimension translation,
DisplayIndependentRectangle rectangle)
{
return translateRectangle(translation.width, translation.height, rectangle);
}
/**
* Returns the dimension needed to translate the given rectangle to the given location .
*
* @param rectangleToTranslate
* the rectangle to translate
* @param x
* the x coordinate to translate the rectangle to
* @param y
* the y coordinate to translate the rectangle to
* @return the translation
*/
public static DisplayIndependentDimension getTranslation(DisplayIndependentRectangle rectangleToTranslate, double x,
double y)
{
return new DisplayIndependentDimension(x - rectangleToTranslate.x, y - rectangleToTranslate.y);
}
/**
* Gets the translation necessary to move the source coordinate to the target coordinate.
*
* @param sourceCoordinate
* the source x
* @param targetCoordinate
* the target x
* @return the translation
*/
public static double getTranslation(double sourceCoordinate, double targetCoordinate)
{
return targetCoordinate - sourceCoordinate;
}
/**
* Answers whether the bottom of the first rectangle ends before the second rectangle's top starts (y coordinate).
*
* @param theseBounds
* the first rectangle that shall end before the first one
* @param thoseBounds
* the second rectangle that shall start after the first one ends
* @return true, if successful
*/
public static boolean bottomEndsBefore(DisplayIndependentRectangle theseBounds,
DisplayIndependentRectangle thoseBounds)
{
return theseBounds.y + theseBounds.height < thoseBounds.y;
}
/**
* Expands the given rectangle to to the minimum size which can hold both this Rectangle and the rectangle (x, y, w,
* h).
*
* @param x
* X coordinate to expand the rectangle to.
* @param y
* Y coordinate to expand the rectangle to.
* @param rectangle
* the rectangle to expand
* @param width
* the width (starting at the x coordinate) to expand the rectangle to
* @param height
* the height (starting at the y coordinate) to expand the rectangle to
*/
public static DisplayIndependentRectangle union(DisplayIndependentRectangle rectangle, double x, double y,
double width, double height)
{
DisplayIndependentRectangle bounds = new DisplayIndependentRectangle();
double right = Math.max(rectangle.x + rectangle.width, x + width);
double bottom = Math.max(rectangle.y + rectangle.height, y + height);
bounds.x = Math.min(rectangle.x, x);
bounds.y = Math.min(rectangle.y, y);
bounds.width = right - bounds.x;
bounds.height = bottom - bounds.y;
return bounds;
}
/**
* Expands the given first rectangle to the minimum size which can hold both this Rectangle and the second rectangle.
*
* @param thisRectangle
* the rectangle to expand
* @param thatRectangle
* the rectangle to include in the first one
* @return the new bounds
*/
public static DisplayIndependentRectangle union(DisplayIndependentRectangle thisRectangle,
DisplayIndependentRectangle thatRectangle)
{
return union(thisRectangle, thatRectangle.x, thatRectangle.y, thatRectangle.width, thatRectangle.height);
}
/**
* Scales the given rectangle by the given factors.
*
* @param width
* the width
* @param height
* the height
* @param bounds
* the bounds
*/
public static void scaleRectangle(double width, double height, DisplayIndependentRectangle bounds)
{
bounds.width *= width;
bounds.height *= height;
}
/**
* Subtracts the given height and width from the given rectangle and move its origin by the half of the given values.
*
* @param dimension
* the dimension
* @param rectangle
* the rectangle
*/
public static DisplayIndependentRectangle substractBorders(DisplayIndependentDimension dimension,
DisplayIndependentRectangle rectangle)
{
DisplayIndependentRectangle newRectangle = new DisplayIndependentRectangle();
newRectangle.x = rectangle.x + dimension.width / 2;
newRectangle.y = rectangle.y + dimension.height / 2;
newRectangle.width = rectangle.width - dimension.width;
newRectangle.height = rectangle.height - dimension.height;
return newRectangle;
}
/**
* Centers the given rectangle on the bounds of the given other rectangle.
*
* @param rectangleToCenter
* the rectangle to center
* @param rectangle
* the rectangle
*/
public static void center(DisplayIndependentRectangle rectangleToCenter, DisplayIndependentRectangle rectangle)
{
if (rectangle == null)
{
rectangleToCenter.x -= rectangleToCenter.width / 2;
rectangleToCenter.y -= rectangleToCenter.height / 2;
}
else
{
rectangleToCenter.x = rectangle.x + (rectangleToCenter.width - rectangle.width) / 2;
rectangleToCenter.y = rectangle.y + (rectangleToCenter.height - rectangle.height) / 2;
}
}
}
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