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