Implement SVGPolygonRenderer

Normally renders polygons, but can also render polylines if passed the
'open' option.

src/Rasterization/Renderers/SVGPolygonRenderer.php

@@ -0,0 +1,59 @@
+<?php
+
+namespace JangoBrick\SVG\Rasterization\Renderers;
+
+use JangoBrick\SVG\Rasterization\SVGRasterizer;
+
+class SVGPolygonRenderer extends SVGRenderer
+{
+    protected function prepareRenderParams(SVGRasterizer $rasterizer, array $options)
+    {
+        $scaleX = $rasterizer->getScaleX();
+        $scaleY = $rasterizer->getScaleY();
+
+        $points = array();
+        foreach($options['points'] as $point) {
+            $points[] = $point[0] * $scaleX;
+            $points[] = $point[1] * $scaleY;
+        }
+
+        return array(
+            'open'      => isset($options['open']) ? $options['open'] : false,
+            'points'    => $points,
+            'numpoints' => count($options['points']),
+        );
+    }
+
+    protected function renderFill($image, array $params, $color)
+    {
+        // somehow imagesetthickness() affects the polygon drawing. reset to 0.
+        imagesetthickness($image, 0);
+        imagefilledpolygon($image, $params['points'], $params['numpoints'], $color);
+    }
+
+    protected function renderStroke($image, array $params, $color, $strokeWidth)
+    {
+        imagesetthickness($image, $strokeWidth);
+
+        if ($params['open']) {
+            $this->renderStrokeOpen($image, $params['points'], $color);
+            return;
+        }
+
+        imagepolygon($image, $params['points'], $params['numpoints'], $color);
+    }
+
+    private function renderStrokeOpen($image, array $points, $color)
+    {
+        $px = $points[0];
+        $py = $points[1];
+
+        for ($i = 2, $n = count($points); $i < $n; $i += 2) {
+            $x = $points[$i];
+            $y = $points[$i + 1];
+            imageline($image, $px, $py, $x, $y, $color);
+            $px = $x;
+            $py = $y;
+        }
+    }
+}

src/Rasterization/SVGRasterizer.php

@@ -53,6 +53,7 @@ private static function createDependencies()
             'rect'      => new Renderers\SVGRectRenderer(),
             'line'      => new Renderers\SVGLineRenderer(),
             'ellipse'   => new Renderers\SVGEllipseRenderer(),
+            'polygon'   => new Renderers\SVGPolygonRenderer(),
         );
     }