<?php

/*
**************************************************
Class: Line.php
**************************************************
Author: Tsiavos Chris <hide@address.com>
Date: October 2004
**************************************************/

/**
*Includes the  shape abstract class
*/
require_once("Shape.php");

/**
*Wrapper around gd's ImageLine function
*@author Tsiavos Chris <hide@address.com> 
*@license http://opensource.org/licenses/gpl-license.php GNU Public License
*/
class Line extends Shape {
	
	/**
	*@access private
	*@var string[]
	*/
	private $Points=array();
	
	/**
	*The line breadth
	*@access private
	*@return integer
	*/
	private $Breadth;
	
	/**
	*Constructor
	*@param mixed &$Canvas reference to the image handler the line will be drawn in
	*@param ColorAllocator &$ColorAllocator reference to the ColorAllocator the class will use for allocating the line color
	*@param string ("Yes","No") $UseAntialias specifies if antialias functions should be used or not when drawing the line
	*@param integer $Breadth
	*/
	public function __construct(&$Canvas,ColorAllocator &$ColorAllocator,$UseAntialias,$Breadth=NULL) {
		Shape::__construct($Canvas,$ColorAllocator,$UseAntialias);
		$this->Breadth=$Breadth;
	}
	
	/**
	*Adds a point to the line
	*@access public
	*@return void 
	*/
	public function add_Point($point) {
		array_push($this->Points,$point);
	}
	
	/**
	*Returns the line's points
	*@access public
	*@return string[]
	*/
	public function get_Points() {
		return $this->Points;
	}
	
	/**
	*Draws a dashed line
	*@access public
	*@return void
	*@param string $BorderColor 
	*@param integer 0-127 $Alpha
	*/
	public function draw_Dashed($BorderColor,$Alpha) {
		$ColorHandler=$this->ColorAllocator->Allocate($this->Canvas,$BorderColor,$BorderColor,$Alpha,1); 
	
		for ($i=0;$i<count($this->Points);$i++) {
			
			$current=$i;
			
			if ($current==count($this->Points)-1)
				$next=$current;
			else
				$next=$i+1;
			
			$StartPoint=explode(",",$this->Points[$current]);
			$FinishPoint=explode(",",$this->Points[$next]);
			
			ImageDashedLine($this->Canvas,$StartPoint[0],$StartPoint[1],$FinishPoint[0],$FinishPoint[1],$ColorHandler);
		}
	}
	
	/**
	*Draws the border of a line 
	*@access public
	*@return void
	*@param string $BorderColor 
	*@param integer 0-127 $Alpha
	*/
	public function draw($BorderColor,$Alpha) {	
		if ($this->UseAntialias=="Yes")
			ImageAntialias($this->Canvas,1);
		
		$ColorHandler=$this->ColorAllocator->Allocate($this->Canvas,$BorderColor,$BorderColor,$Alpha,1); 
		
		for ($i=0;$i<count($this->Points);$i++) {
			
			$current=$i;
			
			if ($current==count($this->Points)-1)
				$next=$current;
			else
				$next=$i+1;
			
			$StartPoint=explode(",",$this->Points[$current]);
			$FinishPoint=explode(",",$this->Points[$next]);
			
			ImageLine($this->Canvas,$StartPoint[0],$StartPoint[1],$FinishPoint[0],$FinishPoint[1],$ColorHandler);
			
			if ($this->Breadth!=NULL)
				ImageLine($this->Canvas,$StartPoint[0],$StartPoint[1]+$this->Breadth,$FinishPoint[0],$FinishPoint[1]+$this->Breadth,$ColorHandler);
		}
		
		if ($this->UseAntialias=="Yes")
			ImageAntialias($this->Canvas,0);
	}
	
	/**
	*Draws a filled with color line
	*@access public
	*@return void
	*@param string $StartColor
	*@param string $FinishColor
	*@param integer 0-127 $Alpha
	*/
	public function draw_Filled($StartColor,$FinishColor,$Alpha) {	
		$ColorHandler=$this->ColorAllocator->Allocate($this->Canvas,$StartColor,$FinishColor,$Alpha,$this->Breadth);	
		
		if (is_array($ColorHandler))
			$this->draw_GradientLine($ColorHandler);
		else
			$this->draw_NormalLine($ColorHandler);
		
	}
	
	/**
	*Draws a gradient color line with breadth=$this->Breadth
	*@access private
	*@return void
	*@param mixed $ColorHandler
	*/
	private function draw_GradientLine($ColorHandler) {
		
		for ($i=0;$i<count($this->Points);$i++) {
			
			$current=$i;
			
			if ($current==count($this->Points)-1)
				$next=$current;
			else
				$next=$i+1;
			
			$StartPoint=explode(",",$this->Points[$current]);
			$FinishPoint=explode(",",$this->Points[$next]);
			
			for ($breadth=0;$breadth<$this->Breadth;$breadth++) 
				ImageLine($this->Canvas,$StartPoint[0],$StartPoint[1]+$breadth,$FinishPoint[0],$FinishPoint[1]+$breadth,$ColorHandler[$breadth]);	
		}
		
	}
	
	/**
	*Draws a uniform color line with breadth=$this->Breadth
	*@access private
	*@return void
	*@param mixed $ColorHandler
	*/
	private function draw_NormalLine($ColorHandler) {
		for ($i=0;$i<count($this->Points);$i++) {
			
			$current=$i;
			
			if ($current==count($this->Points)-1)
				$next=$current;
			else
				$next=$i+1;
				
			$StartPoint=explode(",",$this->Points[$current]);
			$FinishPoint=explode(",",$this->Points[$next]);
			
			for ($breadth=0;$breadth<$this->Breadth;$breadth++)
				ImageLine($this->Canvas,$StartPoint[0],$StartPoint[1]+$breadth,$FinishPoint[0],$FinishPoint[1]+$breadth,$ColorHandler);
		}
	}
	
}

?>