33-3: Two different types of series in Java

Generation Quick Response Code in Java 33-3: Two different types of series
Listing 33-3: Two different types of series
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<cfchart format= png scalefrom= 0 scaleto= 10000000 > <cfchartseries type= line serieslabel= Advertising seriescolor= ##FF0000 > ... </cfchartseries> <cfchartseries type= bar serieslabel= R & D seriescolor= ##0000FF > ... </cfchartseries> </cfchart>
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33 Charting Data with ColdFusion MX
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Ten types of series are available, and all look rather different from each other. The following sections show you each type in detail through a series of figures showing the 2-D and 3-D representations of each type side by side.
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Scatter
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A scatter chart is also referred to as a scatter plot or scatter graph. Data points in a scatter chart are represented by single points or markers on the chart, as shown in Figure 33-5.
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Figure 33-5: Scatter charts. Notice that the 3-D version can be rather misleading and probably should not be used unless you have another series represented by a different type shown along with the scatter chart.
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Line
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A line chart plots a point at each data point and then draws a line connecting each dot to the next one. Figure 33-6 shows both a 2-D and a 3-D line chart.
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Figure 33-6: Line charts.
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Part VI Extending Your ColdFusion MX Applications
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Curve
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A curve chart is very similar to a line chart, but instead of drawing a straight line between data points, CFCHART draws a curved line connecting all the points, as shown in Figure 33-7.
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Figure 33-7: Curve charts.
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Step
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A step chart is also similar to a line chart, except that every line in the chart is parallel to an axis, as shown in Figure 33-8.
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Figure 33-8: Step charts.
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33 Charting Data with ColdFusion MX
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Area
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An area chart is a line chart that s been filled from the line to the x-axis, as shown in Figure 33-9.
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Figure 33-9: Area charts.
A bar chart shows just that: a bar representing each data point from the zero-point of the y-axis to the data point. In 3-D mode, a bar chart is represented as a rectangular tower. Figure 33-10 shows the bar chart in action.
Figure 33-10: Bar charts.
Part VI Extending Your ColdFusion MX Applications
Cylinder
In 2-D mode, a cylinder chart looks exactly like a bar chart. In 3-D mode, however, the cylinder chart uses cylinders instead of rectangular towers, as shown in Figure 33-11.
Figure 33-11: Cylinder charts.
Cone
A cone chart is like a cylinder chart except that it uses a cone instead of a cylinder in 3-D mode (see Figure 33-12).
Figure 33-12: Cone charts.
33 Charting Data with ColdFusion MX
Pyramid
A pyramid chart is like a cylinder chart except that it uses a pyramid instead of a cylinder in 3-D mode, as shown in Figure 33-13.
Figure 33-13: Pyramid charts.
A pie chart is different from the other nine types. A pie chart can have only a single series, and it represents fractions of a whole rather than individual data points. Figure 33-14 shows advertising revenue as a pie chart.
Figure 33-14: A pie chart. The entire circle represents all of the revenue made from 1997-2001, and each slice of the pie is proportional to how much each year contributed to the total five-year revenue stream. Note that you can also explode pie slices by setting pieslicestyle= sliced in the CFCHART tag.
Part VI Extending Your ColdFusion MX Applications
Creating a Chart from the Database
You ve already seen in the section Creating a chart how to create a chart by using manually plotted data points, but that s probably not going to happen very often in the real world. Your data points and series are much more likely to come from a database. The rest of the sections in this chapter are devoted to using database-driven charts.
The stocks database
Our chart is going to show the closing values of the Dow Jones Industrial Average over a sixmonth period. For this purpose, we ve created an Access database named Ch33.mdb that is structured as shown in Figure 33-15. This database is on the companion CD-ROM.
Figure 33-15: A stocks database.
Creating the chart
Because our data points come from a database query rather than manual CFCHARTDATA tags, we must use three new attributes of CFCHARTSERIES, as shown in bold in Listing 33-4.