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<?php |
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use Bmichotte\Dijkstra\Point; |
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use Bmichotte\Dijkstra\Dijkstra; |
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function findLink(int $minDistance, array &$positions): void |
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{ |
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foreach ($positions as $point) { |
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findLinkBetween($minDistance, $point, $positions); |
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} |
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} |
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function findLinkBetween(int $minDistance, Point &$point1, array &$positions): void |
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{ |
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foreach ($positions as $point2) { |
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if ($point1->equals($point2)) { |
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continue; |
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} |
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$distance = Dijkstra::distance($point1, $point2); |
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if ($distance < $minDistance) { |
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$point1->addPoint($point2); |
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} |
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} |
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if (0 === count($point1->points)) { |
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findLinkBetween($minDistance * 2, $point1, $positions); |
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} |
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} |
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function findFromTo(array $positions): array |
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{ |
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$from = null; |
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$to = null; |
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foreach ($positions as $point) { |
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$from = $from ?: $point; |
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$to = $to ?: $point; |
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if ($point->x < $from->x && $point->y < $from->y) { |
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$from = $point; |
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} |
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if ($point->x > $to->x && $point->y > $to->y) { |
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$to = $point; |
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} |
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} |
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return [$from, $to]; |
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} |
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function drawPaths(int $max, array $positions, Point $from, Point $to, array $shortestPath, string $filename): void |
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{ |
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// open background |
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$image = imagecreatetruecolor($max, $max); |
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if ($image === false) { |
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throw new Exception('Can not create image'); |
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} |
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$color = imagecolorallocate($image, 255, 255, 255); |
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imagefill($image, 0, 0, $color); |
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// first run, draw lines |
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$color = imagecolorallocate($image, 32, 230, 200); |
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foreach ($positions as $point) { |
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foreach ($point->points as $link) { |
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drawLine($image, $point, $link, $color); |
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} |
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} |
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// then, draw the points |
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$color = imagecolorallocate($image, 32, 230, 36); |
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foreach ($positions as $point) { |
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imagefilledellipse($image, $point->x, $point->y, 10, 10, $color); |
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} |
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// draw the shortest path |
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$color = imagecolorallocate($image, 255, 0, 255); |
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$shortestPathLength = count($shortestPath); |
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for ($i = 0; $i < $shortestPathLength; $i++) { |
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$p = $shortestPath[$i]; |
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if (isset($shortestPath[$i + 1])) { |
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$d = $shortestPath[$i + 1]; |
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drawLine($image, $p, $d, $color, 3); |
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} |
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} |
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// and finally, draw the from and to points |
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$color = imagecolorallocate($image, 255, 0, 255); |
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imagefilledellipse($image, $from->x, $from->y, 10, 10, $color); |
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imagefilledellipse($image, $to->x, $to->y, 10, 10, $color); |
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imagepng($image, $filename); |
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imagedestroy($image); |
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} |
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function drawLine($image, Point $point1, Point $point2, $color, int $thick = 1): void |
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{ |
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if (null === $point1 || null === $point2) { |
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return; |
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} |
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if (null === $point1->x || null === $point1->y) { |
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return; |
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} |
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if (null === $point2->x || null === $point2->y) { |
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return; |
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} |
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if ($point1->x === $point2->x) { |
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$from = $point1->y < $point2->y ? $point1 : $point2; |
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$to = $point1->y > $point2->y ? $point1 : $point2; |
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} else { |
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$from = $point1->x < $point2->x ? $point1 : $point2; |
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$to = $point1->x > $point2->x ? $point1 : $point2; |
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} |
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imagesetthickness($image, $thick); |
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imageline($image, $from->x, $from->y, $to->x, $to->y, $color); |
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} |
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bmichotte /
dijkstra
