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msd2/tracking/piwik/vendor/szymach/c-pchart/doc/spring.md

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+# Drawing a spring chart
+
+[Reference](http://wiki.pchart.net/doc.spring.drawspring.html)
+
+```php
+require '/path/to/your/vendor/autoload.php';
+
+use CpChart\Chart\Image;
+use CpChart\Chart\Spring;
+
+/* Create the Image object */
+$image = new Image(300, 300);
+
+/* Background customization */
+$image->drawGradientArea(0, 0, 300, 300, DIRECTION_HORIZONTAL, [
+    "StartR" => 217,
+    "StartG" => 250,
+    "StartB" => 116,
+    "EndR" => 181,
+    "EndG" => 209,
+    "EndB" => 27,
+    "Alpha" => 100
+]);
+$image->drawGradientArea(0, 0, 300, 20, DIRECTION_VERTICAL, [
+    "StartR" => 0,
+    "StartG" => 0,
+    "StartB" => 0,
+    "EndR" => 50,
+    "EndG" => 50,
+    "EndB" => 50,
+    "Alpha" => 100
+]);
+$image->drawRectangle(0, 0, 299, 299, ["R" => 0, "G" => 0, "B" => 0]);
+$image->setFontProperties(["FontName" => "Silkscreen.ttf", "FontSize" => 6]);
+$image->drawText(10, 13, "pSpring - Draw spring charts", ["R" => 255, "G" => 255, "B" => 255]);
+
+/* Prepare the graph area */
+$image->setGraphArea(20, 20, 280, 280);
+$image->setFontProperties(["FontName" => "Forgotte.ttf", "FontSize" => 9, "R" => 80, "G" => 80, "B" => 80]);
+$image->setShadow(true, ["X" => 2, "Y" => 2, "R" => 0, "G" => 0, "B" => 0, "Alpha" => 10]);
+
+/* Create the pSpring object */
+$springChart = new Spring();
+
+/* Set the nodes default settings */
+$springChart->setNodeDefaults(["FreeZone" => 50]);
+
+/* Build random nodes & connections */
+for ($i = 0; $i <= 10; $i++) {
+    $connections = [];
+    for ($j = 0; $j <= rand(0, 1); $j++) {
+        $connections[] = rand(0, 10);
+    }
+    $springChart->addNode($i, ["Name" => "Node " . $i, "Connections" => $connections]);
+}
+
+/* Compute and draw the Spring Graph */
+$springChart->drawSpring($image, ["DrawQuietZone" => true]);
+
+/* Render the picture */
+$image->render("drawSpring3.png");
+```