By enable the links a line will be drawn that connects the data points in order. To use arbitrary angles you must specify TTF fonts. This is done by calling the method. The polar plots have two variants; a full degree plot and a half degree plot. The magnitude can be displayed in either linear or logarithmic scale. It is also perfectly legal to override the default labels for the Y and Y2 axis in the same way, however there is seldom need for that. So in order to create a linear equ-distance ordered set we need to further augment the two data sets as.

A variant of the scatter plot is the linked scatter plot. The data set is specified as a 2D matrice. It is often used in signal processing to illustrate a sampled analogue signal which consists of a weighted pulse train. It is also possible, for accumulated line plots, to force the first and last unknown value to be equal to 0 zero. Once we have multiple data series there is a need to separate them and that is usually done by adding a legend box with suitable titles. Filled line plots is only supposed to be used with positive values. The internal fonts which we have been using so only supports 0 or 90 degrees rotation.

In the second image below a callback function for the formatting of the Y-axis values is used to format the label as a number with thousand separator. Caution The colors of the marks will, if you don’t specify them explicitly, follow the line color. Stock Plots Another type of plots is the so-called Stock plots. In the example below we show a typical damped impulse response. Field Plots Field plots is a scatter plot with a twist. Text and font handling this will adjust the fonts of the titles to make use of a bold variant of the built-in bitmap fonts.

Standard Bar plots Bar plots is also well catered for. In addition to the built in plot marks it is also possible to use a user specified image as a plot mark.

The fourth argument specifies the fill color and the fifth argument specifies if the area should have a border edge or not. An example with some code snippets will make exampoe approach clear.


Chapter Different types of linear (cartesian) graph types

If you want to use three line plots in an accumulated line plot graph you write the following code. Partially filled area graphs In the examples below we have chosen to align the line with the center of the bars.

Tip In addition to the built in plot marks it is exampel possible to use a user specified image as a plot mark. The most common use of this feature is to just use one extra y-axis with a different scale on the right side of the graph.

With the help of the SetLabelAngle. The value is applied to all labels. The reason is that even though it jpgrapb possible to n scale them by the third argument there is a visual degradation to scale an image larger than it’s original size since some pixels needs to be interpolated.

You specify the jptraph as a fraction of the overall width and height of the entire image. The margins have been slightly increased to account for the titles of the axis.

More information about these types of plots are available in the information for the Pro-version of JpGraph. Partially filled area graphs. The first entry must be the class and the second entry must be the method name. Line graphs we will use the term line graph to refer to an entire graph and the term line plot to refer to a single data series in a line graph is together with bar graphs the simplest and perhaps the most commonly used graph type.

Another variant is to have the fill go from the top of the plot area down to the line.

PHP LinePlot Examples

Examplr we increase the right margin and then we place the legend so that it is roughly centred. Filled Line Plots Line pots can also be filled both with a solid color, a semi transparent color or a gradient fill both horizontal and vertical.

This is done by one of two ways.

Image maps exaample Box and Stock charts Setting a manual fill color. A basic gradient fill using default values gradlinefillex1. We could for example choose to rotate the labels on the X-axis by 90 degrees.


First we increase the right margin and then we place the legend so that it is roughly centered in the right margin area. This is done by a call to. We exampke this with a call to. By default it is placed with it’s top right corner close to the upper right edge of the image. As was mentioned in the introduction a graph can have an unlimited number of data series plots although from a practical consideration and “viewability” it is probably best to restrict the examle of data series in one graph to less than To specify the scale for the Y2 axis you use the SetY2Scale Since you only specify one axis you only specify “half” of the string in the previous examples.

Pie Plots For Pie plots all the ordinary formatting colors, size etc is of course available. Line graphs supports automatic linear interpolation of missing data point if the missing data point is replaced by a ‘-‘ hyphen character for more on handling of NULLs in the input data see Different types of NULL data handling.

Test suite for JpGraph – examplephp

So, this kind of data preparation must be done in the domain of the given data set where knowledge of the underlying data will allow an accurate preparation of the input jpbraph a graphing script if we insist of plotting an accumulated graph. Adding a left,right and center footer footerex1. If the data value is null “” or the special value “x” then the data point will not be plotted and will leave a gap in the line.

But when I tired to receive data from csv file, only plot is generated, but data lines not shown.