+Show TOC
×Hide TOC

GeomUtil

Kind of class:	public class
Package:	org.casalib.util
Inherits from:	none
Version:	04/27/08
Author:	Aaron Clinger
Classpath:	org.casalib.util.GeomUtil
File last modified:	Monday, 01 December 2008, 11:16:36

► View source

▼ Hide source

/*
    CASA Lib for ActionScript 3.0
    Copyright (c) 2008, Aaron Clinger & Contributors of CASA Lib
    All rights reserved.
    
    Redistribution and use in source and binary forms, with or without
    modification, are permitted provided that the following conditions are met:
    
    - Redistributions of source code must retain the above copyright notice,
      this list of conditions and the following disclaimer.
    
    - Redistributions in binary form must reproduce the above copyright notice,
      this list of conditions and the following disclaimer in the documentation
      and/or other materials provided with the distribution.
    
    - Neither the name of the CASA Lib nor the names of its contributors
      may be used to endorse or promote products derived from this software
      without specific prior written permission.
    
    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
    ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
    LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
    CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
    SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
    INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
    CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
    ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
    POSSIBILITY OF SUCH DAMAGE.
*/
package org.casalib.util {
    import flash.geom.Point;
    import flash.geom.Rectangle;
    import org.casalib.util.ConversionUtil;
    
    /**
        Utilities for positioning, calculating and manipulating geometeric shapes.
        
        @author Aaron Clinger
        @version 04/27/08
    */
    public class GeomUtil {
        
        
        /**
            Rotates a Point around another Point by the specified angle.
            
            @param point: The Point to rotate.
            @param centerPoint: The Point to rotate this Point around.
            @param angle: The angle (in degrees) to rotate this point.
        */
        public static function rotatePoint(point:Point, centerPoint:Point, angle:Number):void {
            var radians:Number = ConversionUtil.degreesToRadians(angle);
            var baseX:Number   = point.x - centerPoint.x;
            var baseY:Number   = point.y - centerPoint.y;
            
            point.x = (Math.cos(radians) * baseX) - (Math.sin(radians) * baseY) + centerPoint.x;
            point.y = (Math.sin(radians) * baseX) + (Math.cos(radians) * baseY) + centerPoint.y;
        }
        
        /**
            Determines the angle/degree between the first and second point.
            
            @param first: The first Point.
            @param second: The second Point.
            @return The degree between the two points.
        */
        public static function angle(first:Point, second:Point):Number {
            return Math.atan((first.y - second.y) / (first.x - second.x)) / (Math.PI / 180);
        }
        
        /**
            Calculates the perimeter of a rectangle.
            
            @param rect: Rectangle to determine the perimeter of.
        */
        public static function getRectanglePerimeter(rect:Rectangle):Number {
            return rect.width * 2 + rect.height * 2;
        }
    }
}

Utilities for positioning, calculating and manipulating geometeric shapes.

Summary

Class methods

rotatePoint (point:Point, centerPoint:Point, angle:Number) : void
- Rotates a Point around another Point by the specified angle.
angle (first:Point, second:Point) : Number
- Determines the angle/degree between the first and second point.
getRectanglePerimeter (rect:Rectangle) : Number
- Calculates the perimeter of a rectangle.

Class methods

angle

public static function angle (

first:Point, second:Point) : Number

Determines the angle/degree between the first and second point.

Parameters:

first :

The first Point.

second:

The second Point.

Returns:

The degree between the two points.

getRectanglePerimeter

public static function getRectanglePerimeter (

rect:Rectangle) : Number

Calculates the perimeter of a rectangle.

Parameters:

rect:

Rectangle to determine the perimeter of.

rotatePoint

public static function rotatePoint (

point:Point, centerPoint:Point, angle:Number) : void

Rotates a Point around another Point by the specified angle.

Parameters:

point :

The Point to rotate.

centerPoint:

The Point to rotate this Point around.

angle :

The angle (in degrees) to rotate this point.