Feature/polygon drawer

src/Drawer/Polygon/NativePolygonDrawer.php

@@ -0,0 +1,54 @@
+<?php
+
+namespace Runalyze\StaticMaps\Drawer\Polygon;
+
+use Runalyze\StaticMaps\Drawer\PainterAwareTrait;
+
+class NativePolygonDrawer
+{
+    use PainterAwareTrait;
+
+    /** @var bool */
+    protected $IsNativeFunctionAvailable;
+
+    /** @var array [polyline_1, polyline_2, ...] with each polyline [[x, y], [x, y], ...] */
+    protected $Polylines = [];
+
+    public function __construct()
+    {
+        $this->IsNativeFunctionAvailable = function_exists('imageantialias');
+    }
+
+    public function addPolygon(array $points)
+    {
+        $this->Polylines[] = array_map(function ($point) {
+            return [(int)round($point[0]), (int)round($point[1])];
+        }, $points);
+    }
+
+    public function drawPolygons($image)
+    {
+        $this->prepareNativeDrawing($image->getCore());
+
+        $color = $this->allocateColor($image->getCore());
+        foreach ($this->Polylines as $points) {
+            $numPoints = count($points);
+
+            // Flatten points into one big flat array of integers
+            $image->polygon(array_merge(...$points), function ($draw) use ($color) {
+                $draw->border(1, $color);
+                $draw->background($color);
+            });
+        }
+    }
+
+    protected function prepareNativeDrawing($resource)
+    {
+        imagesetthickness($resource, $this->LineWidth);
+        imagealphablending($resource, true);
+
+        if ($this->IsNativeFunctionAvailable) {
+            imageantialias($resource, true);
+        }
+    }
+}

src/Feature/Polygon.php

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+<?php
+
+namespace Runalyze\StaticMaps\Feature;
+
+use Intervention\Image\Image;
+use Intervention\Image\ImageManager;
+use Runalyze\StaticMaps\Viewport\ViewportInterface;
+use Runalyze\StaticMaps\Drawer\Polygon\NativePolygonDrawer;
+use Runalyze\StaticMaps\Drawer\Polyline\NativePolylineDrawer;
+
+class Polygon extends \Runalyze\StaticMaps\Feature\Route
+{
+    public function render(ImageManager $imageManager, Image $image, ViewportInterface $viewport)
+    {
+        $drawer = new NativePolygonDrawer();
+        $drawer->setPainter(
+            $this->LineColor[0],
+            $this->LineColor[1],
+            $this->LineColor[2],
+            $this->LineColor[3],
+            $this->LineWidth
+        );
+
+        foreach ($this->LineSegments as $segment) {
+            $points = $this->getPoints($viewport, $segment);
+
+            $drawer->addPolygon($points);
+        }
+
+        $drawer->drawPolygons($image);
+    }
+
+    /**
+     * Converts coordinates into relative x,y pixel points for drawing as a polygon
+     *
+     * @param  ViewportInterface $viewport
+     * @param  array $segment
+     * @return array
+     */
+    private function getPoints(ViewportInterface $viewport, iterable $segment)
+    {
+        $points = [$this->getRelativePositionForPoint($viewport, $segment[0])];
+        $numPoints = count($segment);
+        $lastPoint = 0;
+
+        if (1 == $numPoints) {
+            $numPoints = 2;
+            $segment[1] = $segment[0];
+        }
+
+        for ($i = 1; $i < $numPoints; ++$i) {
+            list($x1, $y1) = $this->getRelativePositionForPoint($viewport, $segment[$lastPoint]);
+            list($x2, $y2) = $this->getRelativePositionForPoint($viewport, $segment[$i]);
+
+            if (0.0 < $this->LineSimplificationTolerance
+                && $i !== $numPoints - 1
+                && sqrt(pow($x2 - $x1, 2.0) + pow($y2 - $y1, 2.0)) < $this->LineSimplificationTolerance) {
+                continue;
+            }
+
+            $points[] = [$x2, $y2];
+            $lastPoint = $i;
+        }
+
+        return $points;
+    }
+}