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

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+# Drawing a spline chart
+
+[Reference](http://wiki.pchart.net/doc.chart.drawsplinechart.html)
+
+```php
+require '/path/to/your/vendor/autoload.php';
+
+use CpChart\Chart\Data;
+use CpChart\Chart\Image;
+
+// Create and populate data
+$data = new Data();
+$data->addPoints([], "Serie1")
+
+// Create the image and set the data
+$image = $factory->newImage(700, 230, $data);
+$image->setShadow(true, ["X" => 1, "Y" => 1, "R" => 0, "G" => 0, "B" => 0, "Alpha" => 20]);
+
+// 1st spline drawn in white with control points visible
+$firstCoordinates = [[40, 80], [280, 60], [340, 166], [590, 120]];
+$fistSplineSettings = ["R" => 255, "G" => 255, "B" => 255, "ShowControl" => true];
+$image->drawSpline($firstCoordinates, $fistSplineSettings);
+
+// 2nd spline dashed drawn in white with control points visible
+$secondCoordinates = [[250, 50], [250, 180], [350, 180], [350, 50]];
+$secondSplineSettings = [
+    "R" => 255,
+    "G" => 255,
+    "B"=> 255,
+    "ShowControl" => true,
+    "Ticks" => 4
+];
+$image->drawSpline($secondCoordinates, $secondSplineSettings);
+
+// Render the picture (choose the best way)
+$image->autoOutput("example.drawSpline.png");
+```