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

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+# Drawing a contour chart
+
+[Reference](http://wiki.pchart.net/doc.surface.drawcontour.html)
+
+```php
+require '/path/to/your/vendor/autoload.php';
+
+use CpChart\Chart\Data;
+use CpChart\Chart\Image;
+use CpChart\Chart\Surface;
+
+/* Create the Image object */
+$image = new Image(400, 400);
+
+/* Create a solid background */
+$image->drawFilledRectangle(0, 0, 400, 400, [
+    "R" => 179,
+    "G" => 217,
+    "B" => 91,
+    "Dash" => 1,
+    "DashR" => 199,
+    "DashG" => 237,
+    "DashB" => 111
+]);
+
+/* Do a gradient overlay */
+$image->drawGradientArea(0, 0, 400, 400, DIRECTION_VERTICAL, [
+    "StartR" => 194,
+    "StartG" => 231,
+    "StartB" => 44,
+    "EndR" => 43,
+    "EndG" => 107,
+    "EndB" => 58,
+    "Alpha" => 50
+]);
+$image->drawGradientArea(0, 0, 400, 20, DIRECTION_VERTICAL, [
+    "StartR" => 0,
+    "StartG" => 0,
+    "StartB" => 0,
+    "EndR" => 50,
+    "EndG" => 50,
+    "EndB" => 50,
+    "Alpha" => 100
+]);
+
+/* Add a border to the picture */
+$image->drawRectangle(0, 0, 399, 399, ["R" => 0, "G" => 0, "B" => 0]);
+
+/* Write the picture title */
+$image->setFontProperties(["FontName" => "Silkscreen.ttf", "FontSize" => 6]);
+$image->drawText(10, 13, "pSurface() :: 2D surface charts", ["R" => 255, "G" => 255, "B" => 255]);
+
+/* Define the charting area */
+$image->setGraphArea(20, 40, 380, 380);
+$image->drawFilledRectangle(20, 40, 380, 380, [
+    "R" => 255,
+    "G" => 255,
+    "B" => 255,
+    "Surrounding" => -200,
+    "Alpha" => 20
+]);
+
+$image->setShadow(true, ["X" => 1, "Y" => 1]);
+
+/* Create the surface object */
+$surfaceChart = new Surface($image);
+
+/* Set the grid size */
+$surfaceChart->setGrid(20, 20);
+
+/* Write the axis labels */
+$image->setFontProperties(["FontName" => "pf_arma_five.ttf", "FontSize" => 6]);
+$surfaceChart->writeXLabels(["Position" => LABEL_POSITION_BOTTOM]);
+$surfaceChart->writeYLabels();
+
+/* Add random values */
+for ($i = 0; $i <= 50; $i++) {
+    $surfaceChart->addPoint(rand(0, 20), rand(0, 20), rand(0, 100));
+}
+
+/* Compute the missing points */
+$surfaceChart->computeMissing();
+
+/* Draw the surface chart */
+$surfaceChart->drawSurface(["Border" => true, "Surrounding" => 40]);
+
+/* Draw the contour with a threshold of 50 */
+$surfaceChart->drawContour(50, ["R" => 0, "G" => 0, "B" => 0]);
+
+/* Render the picture (choose the best way) */
+$image->autoOutput("example.surface.png");
+```