/classes/class_artists_similar.php

<?
class ARTISTS_SIMILAR extends ARTIST{
	var $Artists = array();
	var $TotalScore = 0;
	
	var $xValues = array(WIDTH=>1);
	var $yValues = array(HEIGHT=>1);
	
	var $LargestDecimal = 0;
	var $LowestDecimal = 1;
	
	
	
	function dump_data(){
		return serialize(array(time(), $this->Name, $this->x, $this->y, serialize($this->Artists), serialize($this->Similar)));
	}
	
	function load_data($Data){
		list($LastUpdated, $this->Name, $this->x, $this->y, $this->Artists, $this->Similar) = unserialize($Data);
		$this->Artists = unserialize($this->Artists);
		$this->Similar = unserialize($this->Similar);
	}
	
	function set_up(){
		$this->x = ceil(WIDTH/2);
		$this->y = ceil(HEIGHT/2);
		
		$this->xValues[$this->x] = $this->ID;
		$this->yValues[$this->y] = $this->ID;
		
		global $DB;
		
		// Get artists that are directly similar to the artist
		$ArtistIDs = array();
		$DB->query("
			SELECT
			s2.ArtistID,
			ag.Name,
			ass.Score
			FROM artists_similar AS s1
			JOIN artists_similar AS s2 ON s1.SimilarID=s2.SimilarID AND s1.ArtistID!=s2.ArtistID
			JOIN artists_similar_scores AS ass ON ass.SimilarID=s1.SimilarID
			JOIN artists_group AS ag ON ag.ArtistID=s2.ArtistID
			WHERE s1.ArtistID=".$this->ID."
			ORDER BY ass.Score DESC
			LIMIT 14");
		
		if($DB->record_count() == 0){
			return;
		}
		
		// Build into array. Each artist is its own object in $this->Artists
		while(list($ArtistID, $Name, $Score) = $DB->next_record()){
			if($Score<0){
				continue;
			}
			$this->Artists[$ArtistID] = new ARTIST($ArtistID, $Name);
			$this->Similar[$ArtistID] = array('ID'=>$ArtistID,'Score'=>$Score);
			$this->TotalScore+=$Score;
			$ArtistIDs[]=$ArtistID;
		}
		
		// Get similarities between artists on the map
		$DB->query("SELECT
			s1.ArtistID,
			s2.ArtistID
			FROM artists_similar AS s1
			JOIN artists_similar AS s2 ON s1.SimilarID=s2.SimilarID AND s1.ArtistID!=s2.ArtistID
			JOIN artists_similar_scores AS ass ON ass.SimilarID=s1.SimilarID
			JOIN artists_group AS a ON a.ArtistID=s2.ArtistID
			WHERE s1.ArtistID IN(".implode(',',$ArtistIDs).")
			AND s2.ArtistID IN(".implode(',',$ArtistIDs).")
			");
		
		// Build into array
		while(list($Artist1ID, $Artist2ID) = $DB->next_record()){
			$this->Artists[$Artist1ID]->Similar[$Artist2ID] = array('ID'=>$Artist2ID);
		}
		
		// Calculate decimal point scores between artists
		foreach($this->Similar as $SimilarArtist) {
			list($ArtistID, $Similar) = array_values($SimilarArtist);
			$this->Similar[$ArtistID]['Decimal'] =  $this->similarity($Similar['Score'], $this->TotalScore);
			
			if($this->Similar[$ArtistID]['Decimal'] < $this->LowestDecimal){
				$this->LowestDecimal = $this->Similar[$ArtistID]['Decimal'];
			}
			if($this->Similar[$ArtistID]['Decimal'] > $this->LargestDecimal){
				$this->LargestDecimal = $this->Similar[$ArtistID]['Decimal'];
			}
		}
		reset($this->Artists);
	}
	
	function set_positions(){
		$xValues = array(); // Possible x values
		$Root = ceil(WIDTH/4); // Half-way into half of the image
		$Offset = 4; // Distance from the root (a quarter of the way into the image) to the x value
		
		// The number of artists placed in the top or the bottom
		$NumTop = 0;
		$NumBottom = 0;
		
		// The number of artists placed in the left or the right
		$NumLeft = 0;
		$NumRight = 0;
		
		$Multiplier = 0;
		
		// Build up an impressive list of possible x values
		// We later iterate through these, and pick out the ones we want
		
		// These x values are all below WIDTH/2 (all on the left)
		// The script later chooses which side to put them on
		
		// We create more very low x values because they're more likely to be skipped
		for($i = 0; $i<=count($this->Artists)*4; $i++){
			if($Offset>=((WIDTH/4))){
				$Offset=$Offset%(WIDTH/4);
			}
			$Plus = $Root+$Offset; // Point on the right of the root
			$Minus = abs($Root-$Offset); // Point on the left of the root
			
			$xValues[$Plus]=$Plus;
			
			$xValues[$Minus]=$Minus;
			
			// Throw in an extra x value closer to the edge, because they're more likely to be skipped
			
			if($Minus>30){
			//	$xValues[$Minus-30]=$Minus-30;
			}
			
			$Offset = $Offset+rand(5,20); // Increase offset, and go again
		}
		
		foreach($this->Artists as $Artist){
			$ArtistID = $Artist->ID;
			if($Artist->Displayed == true){
				continue;
			}
			$this->Similar[$ArtistID]['Decimal'] = $this->Similar[$ArtistID]['Decimal'] * (1/($this->LargestDecimal))-0.1;
			// Calculate the distance away from the center, based on similarity
			$IdealDistance =  $this->calculate_distance($this->Similar[$ArtistID]['Decimal'], $this->x, $this->y);
			
			$this->Similar[$ArtistID]['Distance'] = $IdealDistance;
			
			// 1 = left, 2 = right
			$Horizontal = 0;
			$Vertical = 0;
			
			// See if any similar artists have been placed yet. If so, place artist in that half 
			// (provided that there are enough in the other half to visually balance out)
			reset($Artist->Similar);
			foreach($Artist->Similar as $SimilarArtist) {
				list($Artist2ID) = array_values($SimilarArtist);
				if($this->Artists[$Artist2ID]) {
					if($this->Artists[$Artist2ID]->x > (WIDTH/2) && ($NumRight-$NumLeft)<1){
						$Horizontal = 2;
					} elseif($NumLeft-$NumRight<1) {
						$Horizontal = 1;
					}
					break;
				}
			}
			
			shuffle($xValues);
			
			while($xValue = array_shift($xValues)){
				if(abs($this->x - $xValue) <= $IdealDistance) {
					if(hypot(abs($this->x - $xValue), ($this->y - 50)) > $IdealDistance 
						|| ceil(sqrt(pow($IdealDistance, 2) - pow($this->x - $xValue, 2))) > (HEIGHT/2)){
						$xValue = $this->x - ceil(sqrt(pow($IdealDistance, 2) - pow($IdealDistance*0.1*rand(5,9), 2)));
						//echo "Had to change x value for ".$Artist->Name." to ".$xValue."\n";
					}
					// Found a match (Is close enough to the center to satisfy $IdealDistance), 
					// Now it's time to choose which half to put it on
					if(!$Horizontal) {
						// No similar artists displayed
						$Horizontal = ($NumLeft<$NumRight) ? 1 : 2;
					}
					if($Horizontal == 2){
						$xValue = WIDTH-$xValue;
						$NumRight++;
					} else {
						$NumLeft++;
					}
					
					$Artist->x = $xValue;
					$this->xValues[$xValue] = $ArtistID;
					unset($xValues[$xValue]);
					
					break;
				}
			}
			if(!$xValue){ // Uh-oh, we were unable to choose an x value.
				$xValue = ceil(sqrt(pow($IdealDistance, 2)/2));
				$xValue = (WIDTH/2)-$xValue;
				$Artist->x = $xValue;
				$this->xValues[$xValue] = $ArtistID;
				unset($xValues[$xValue]);
			}
			
			
			// Pythagoras. $yValue is the vertical distance from the center to the y value
			$yValue = sqrt(pow($IdealDistance, 2) - pow(abs($this->x - $Artist->x), 2));
			
			
			// Now we pick if it should go on the top or bottom
			
			if($NumTop>$NumBottom){ // Send it to the bottom half
				$yValue=(HEIGHT/2)+$yValue;
				$NumBottom++;
			} else {
				$yValue=(HEIGHT/2)-$yValue;
				$NumTop++;
			}
			
			$yValue = ceil($yValue);
			
			// $yValue is now a proper y coordinate
			// Now time to do some spacing out
			
			if($yValue < 10){
				$yValue+=(10+abs($yValue))+rand(10,20);
			}
			
			if($yValue > (HEIGHT - 10)){
				$yValue-=((HEIGHT/2)-rand(10,20));
			}
			
			$i = 1;
			while($Conflict = $this->scan_array_range($this->yValues, abs($yValue-13), $yValue+13)) {
				if($i > 10){
					break;
				}
				if(!$this->scan_array_range($this->yValues, abs($yValue-5), $yValue-20)){
					$yValue -= 20;
				}
				
				$yValue=$Conflict + rand(10, 20);
				if($yValue>HEIGHT-10){
					$yValue-=ceil(HEIGHT/2.5);
				} elseif($yValue<10) {
					$yValue+=ceil(HEIGHT/2.5);
				}
				$i++;
			}
			
			$Artist->y = $yValue;
			$this->yValues[$yValue] = $ArtistID;
		}
		reset($this->Artists);
		reset($this->xValues);
		reset($this->yValues);
		
	}
	
	// Calculate the ideal distance from the center point ($Rootx, $Rooty) to the artist's point on the board
	// Pythagoras as fun!
	function calculate_distance($SimilarityCoefficient, $Rootx, $Rooty){
		$MaxWidth = WIDTH - $Rootx;
		$MaxHeight = HEIGHT - $Rooty;
		$x = $MaxWidth - ($SimilarityCoefficient*$MaxWidth*.01); // Possible x value
		$y = $MaxHeight - ($SimilarityCoefficient*$MaxHeight); // Possible y value
		$Hypot = hypot($Rootx - $x, $Rooty - $y);
		return $MaxWidth - $Hypot;
		
	}
	
	function similarity($Score, $TotalArtistScore){
		return (pow(($Score/($TotalArtistScore+1)), (1/1)));
	}
	
	function scan_array_range($Array, $Start, $Finish){
		if($Start<0){
			die($Start);
		}
		for ($i = $Start; $i<=$Finish; $i++){
			if(isset($Array[$i])){
				return $i;
			}
		}
		return false;
	}
	
	function write_artists(){
?>
		<div style="position:absolute;bottom:<?=$this->y-10?>px;left:<?=$this->x-(strlen($this->Name)*4)?>px;font-size:13pt;" class="similar_artist_header">
			<?=$this->Name?>
		</div>
<?
		
		
		foreach($this->Artists as $Artist){
			if($Artist->ID == $this->ID){
				continue;
			}
			$xPosition = $Artist->x - (strlen($Artist->Name)*4);
			if($xPosition<0){
				$xPosition=3;
				$Artist->x = $xPosition;

			}
			$Decimal = $this->Similar[$Artist->ID]['Decimal'];
			
			if($Decimal<0.2){
				$FontSize = 8;
			} elseif($Decimal<0.3){
				$FontSize = 9;
			} elseif($Decimal<0.4){
				$FontSize = 10;
			} else {
				$FontSize = 12;
			}
?>
		<div style="position:absolute;top:<?=$Artist->y-5?>px;left:<?=$xPosition?>px;font-size:<?=$FontSize?>pt">
			<a href="artist.php?id=<?=$Artist->ID?>" class="similar_artist"><?=$Artist->Name?></a>
		</div>
<?
		}
		reset($this->Artists);
	}
	
	function background_image(){
		global $Img;
		reset($this->Similar);
		foreach($this->Similar as $SimilarArtist) {
			list($ArtistID, $Val) = array_values($SimilarArtist);
			$Artist = $this->Artists[$ArtistID];
			$Decimal = $this->Similar[$ArtistID]['Decimal'];
			$Width = ceil($Decimal*4)+1;
			
			$Img->line($this->x, $this->y, $Artist->x, $Artist->y,$Img->color(199,218,255), $Width);
			
			unset($Artist->Similar[$this->ID]);
			reset($Artist->Similar);
			foreach($Artist->Similar as $SimilarArtist2) {
				list($Artist2ID) = array_values($SimilarArtist2);
				if($this->Artists[$Artist2ID]){
					$Artist2 = $this->Artists[$Artist2ID];
					$Img->line($Artist->x, $Artist->y, $Artist2->x, $Artist2->y,$Img->color(173,201,255));
					unset($Artist2->Similar[$ArtistID]);
				}
			}
			reset($this->xValues);
		}
		
		$Img->make_png(SERVER_ROOT.'/static/similar/'.$this->ID.'.png');
	}
	
	function dump(){
		echo "Similarities:\n";
		foreach($this->Artists as $Artist){
			echo $Artist->ID;
			echo ' - ';
			echo $Artist->Name;
			echo "\n";
			echo "x - ".$Artist->x."\n";
			echo "y - ".$Artist->y."\n";
			print_r($this->Similar[$Artist->ID]);
			//print_r($Artist->Similar);
			echo "\n\n---\n\n";
		}
		
	}
	
	
}


?>