Area charts are ideal for showing trends, especially trends that consolidate two or more variables. "dateAreaApp" automatically places labels at meaningful increments, like months, weeks, hours, etc.

KavaChart ProServe's Timeseries collection uses the object "dateAreaApp" to create timeseries area charts.

Use the source code to this page as a guide in creating your own area charts. You can also use the KavaChart ChartWizard to design your own area charts.

The "dateAreaApp" object is ideal for time series that span many observations, such as this tidal prediction plot.

Since our data isn't stacked, we can use a "baseline" value of "0.0" to provide a visual representation of plus and minus tides. A reference line supplies further information about the mean tide.

DateAreaApp uses both X and Y values. The X values are supplied as timestamps, using the property "dataset0dateValues" for datasets 0 through 39, and Y values are supplied using the property "dataset0yValues", for datasets 0 through 39. Other approaches include using a DataProvider or a web service to acquire the data. These techniques are generally much better, but require a slightly deeper understanding of the page construction process. See the tag and scriptlet examples for several code samples you can adapt to your own data.

For these samples, we use the property "customDatasetHandler", which reads comma-delimited columns of data, like this file.

The object interprets the incoming data using the property "inputDateFormat", which is "yyyy-MM-dd HH:mm" in this case to match our data file. It's worth thinking about how you want to supply this information: in the timezone of the viewer, or the timezone of the local event. In our case, we're using values from Pacific Daylight time, since that's the location for San Francisco's tides. If you're in Tokyo or Brussels, however, the times will obviously be incorrect.

You can adjust timezones using the "timezone" property.

Aug 4, 2003 Tide: 1.875 ft Aug 4, 2003 Tide: 2.148 ft Aug 4, 2003 Tide: 2.471 ft Aug 4, 2003 Tide: 2.821 ft Aug 4, 2003 Tide: 3.178 ft Aug 4, 2003 Tide: 3.522 ft Aug 4, 2003 Tide: 3.833 ft Aug 4, 2003 Tide: 4.094 ft Aug 4, 2003 Tide: 4.284 ft Aug 4, 2003 Tide: 4.389 ft Aug 4, 2003 Tide: 4.396 ft Aug 4, 2003 Tide: 4.299 ft Aug 4, 2003 Tide: 4.098 ft Aug 4, 2003 Tide: 3.804 ft Aug 4, 2003 Tide: 3.437 ft Aug 4, 2003 Tide: 3.023 ft Aug 4, 2003 Tide: 2.595 ft Aug 4, 2003 Tide: 2.188 ft Aug 4, 2003 Tide: 1.836 ft Aug 4, 2003 Tide: 1.568 ft Aug 4, 2003 Tide: 1.405 ft Aug 4, 2003 Tide: 1.359 ft Aug 4, 2003 Tide: 1.433 ft Aug 4, 2003 Tide: 1.621 ft Aug 4, 2003 Tide: 1.911 ft Aug 4, 2003 Tide: 2.285 ft Aug 4, 2003 Tide: 2.723 ft Aug 4, 2003 Tide: 3.206 ft Aug 4, 2003 Tide: 3.71 ft Aug 4, 2003 Tide: 4.216 ft Aug 4, 2003 Tide: 4.7 ft Aug 4, 2003 Tide: 5.141 ft Aug 4, 2003 Tide: 5.515 ft Aug 4, 2003 Tide: 5.799 ft Aug 4, 2003 Tide: 5.971 ft Aug 4, 2003 Tide: 6.015 ft Aug 4, 2003 Tide: 5.919 ft Aug 4, 2003 Tide: 5.682 ft Aug 4, 2003 Tide: 5.313 ft Aug 4, 2003 Tide: 4.832 ft Aug 4, 2003 Tide: 4.269 ft Aug 4, 2003 Tide: 3.66 ft Aug 4, 2003 Tide: 3.047 ft Aug 4, 2003 Tide: 2.469 ft Aug 4, 2003 Tide: 1.963 ft Aug 4, 2003 Tide: 1.557 ft Aug 4, 2003 Tide: 1.268 ft Aug 4, 2003 Tide: 1.104 ft Aug 5, 2003 Tide: 1.062 ft Aug 5, 2003 Tide: 1.132 ft Aug 5, 2003 Tide: 1.297 ft Aug 5, 2003 Tide: 1.538 ft Aug 5, 2003 Tide: 1.834 ft Aug 5, 2003 Tide: 2.165 ft Aug 5, 2003 Tide: 2.512 ft Aug 5, 2003 Tide: 2.857 ft Aug 5, 2003 Tide: 3.182 ft Aug 5, 2003 Tide: 3.473 ft Aug 5, 2003 Tide: 3.711 ft Aug 5, 2003 Tide: 3.884 ft Aug 5, 2003 Tide: 3.978 ft Aug 5, 2003 Tide: 3.985 ft Aug 5, 2003 Tide: 3.904 ft Aug 5, 2003 Tide: 3.741 ft Aug 5, 2003 Tide: 3.508 ft Aug 5, 2003 Tide: 3.226 ft Aug 5, 2003 Tide: 2.921 ft Aug 5, 2003 Tide: 2.622 ft Aug 5, 2003 Tide: 2.36 ft Aug 5, 2003 Tide: 2.161 ft Aug 5, 2003 Tide: 2.045 ft Aug 5, 2003 Tide: 2.026 ft Aug 5, 2003 Tide: 2.109 ft Aug 5, 2003 Tide: 2.293 ft Aug 5, 2003 Tide: 2.566 ft Aug 5, 2003 Tide: 2.916 ft Aug 5, 2003 Tide: 3.324 ft Aug 5, 2003 Tide: 3.77 ft Aug 5, 2003 Tide: 4.236 ft Aug 5, 2003 Tide: 4.698 ft Aug 5, 2003 Tide: 5.136 ft Aug 5, 2003 Tide: 5.528 ft Aug 5, 2003 Tide: 5.85 ft Aug 5, 2003 Tide: 6.08 ft Aug 5, 2003 Tide: 6.199 ft Aug 5, 2003 Tide: 6.189 ft Aug 5, 2003 Tide: 6.04 ft Aug 5, 2003 Tide: 5.751 ft Aug 5, 2003 Tide: 5.331 ft Aug 5, 2003 Tide: 4.798 ft Aug 5, 2003 Tide: 4.181 ft Aug 5, 2003 Tide: 3.517 ft Aug 5, 2003 Tide: 2.846 ft Aug 5, 2003 Tide: 2.209 ft Aug 5, 2003 Tide: 1.643 ft Aug 5, 2003 Tide: 1.177 ft Aug 6, 2003 Tide: 0.831 ft Aug 6, 2003 Tide: 0.615 ft Aug 6, 2003 Tide: 0.526 ft Aug 6, 2003 Tide: 0.556 ft Aug 6, 2003 Tide: 0.689 ft Aug 6, 2003 Tide: 0.906 ft Aug 6, 2003 Tide: 1.188 ft Aug 6, 2003 Tide: 1.516 ft Aug 6, 2003 Tide: 1.873 ft Aug 6, 2003 Tide: 2.243 ft Aug 6, 2003 Tide: 2.61 ft Aug 6, 2003 Tide: 2.959 ft Aug 6, 2003 Tide: 3.274 ft Aug 6, 2003 Tide: 3.541 ft Aug 6, 2003 Tide: 3.744 ft Aug 6, 2003 Tide: 3.871 ft Aug 6, 2003 Tide: 3.915 ft Aug 6, 2003 Tide: 3.875 ft Aug 6, 2003 Tide: 3.757 ft Aug 6, 2003 Tide: 3.576 ft Aug 6, 2003 Tide: 3.355 ft Aug 6, 2003 Tide: 3.12 ft Aug 6, 2003 Tide: 2.899 ft Aug 6, 2003 Tide: 2.721 ft Aug 6, 2003 Tide: 2.608 ft Aug 6, 2003 Tide: 2.579 ft Aug 6, 2003 Tide: 2.643 ft Aug 6, 2003 Tide: 2.799 ft Aug 6, 2003 Tide: 3.043 ft Aug 6, 2003 Tide: 3.36 ft Aug 6, 2003 Tide: 3.737 ft Aug 6, 2003 Tide: 4.152 ft Aug 6, 2003 Tide: 4.586 ft Aug 6, 2003 Tide: 5.019 ft Aug 6, 2003 Tide: 5.427 ft Aug 6, 2003 Tide: 5.79 ft Aug 6, 2003 Tide: 6.085 ft Aug 6, 2003 Tide: 6.288 ft Aug 6, 2003 Tide: 6.378 ft Aug 6, 2003 Tide: 6.339 ft Aug 6, 2003 Tide: 6.159 ft Aug 6, 2003 Tide: 5.834 ft Aug 6, 2003 Tide: 5.371 ft Aug 6, 2003 Tide: 4.788 ft Aug 6, 2003 Tide: 4.116 ft Aug 6, 2003 Tide: 3.39 ft Aug 6, 2003 Tide: 2.654 ft Aug 6, 2003 Tide: 1.95 ft Aug 7, 2003 Tide: 1.319 ft Aug 7, 2003 Tide: 0.792 ft Aug 7, 2003 Tide: 0.392 ft Aug 7, 2003 Tide: 0.129 ft Aug 7, 2003 Tide: 0.004 ft Aug 7, 2003 Tide: 0.008 ft Aug 7, 2003 Tide: 0.125 ft Aug 7, 2003 Tide: 0.337 ft Aug 7, 2003 Tide: 0.625 ft Aug 7, 2003 Tide: 0.971 ft Aug 7, 2003 Tide: 1.36 ft Aug 7, 2003 Tide: 1.776 ft Aug 7, 2003 Tide: 2.205 ft Aug 7, 2003 Tide: 2.633 ft Aug 7, 2003 Tide: 3.04 ft Aug 7, 2003 Tide: 3.409 ft Aug 7, 2003 Tide: 3.72 ft Aug 7, 2003 Tide: 3.956 ft Aug 7, 2003 Tide: 4.102 ft Aug 7, 2003 Tide: 4.151 ft Aug 7, 2003 Tide: 4.105 ft Aug 7, 2003 Tide: 3.977 ft Aug 7, 2003 Tide: 3.787 ft Aug 7, 2003 Tide: 3.563 ft Aug 7, 2003 Tide: 3.337 ft Aug 7, 2003 Tide: 3.14 ft Aug 7, 2003 Tide: 3 ft Aug 7, 2003 Tide: 2.939 ft Aug 7, 2003 Tide: 2.97 ft Aug 7, 2003 Tide: 3.096 ft Aug 7, 2003 Tide: 3.312 ft Aug 7, 2003 Tide: 3.606 ft Aug 7, 2003 Tide: 3.962 ft Aug 7, 2003 Tide: 4.362 ft Aug 7, 2003 Tide: 4.784 ft Aug 7, 2003 Tide: 5.207 ft Aug 7, 2003 Tide: 5.609 ft Aug 7, 2003 Tide: 5.967 ft Aug 7, 2003 Tide: 6.256 ft Aug 7, 2003 Tide: 6.454 ft Aug 7, 2003 Tide: 6.536 ft Aug 7, 2003 Tide: 6.482 ft Aug 7, 2003 Tide: 6.278 ft Aug 7, 2003 Tide: 5.92 ft Aug 7, 2003 Tide: 5.413 ft Aug 7, 2003 Tide: 4.777 ft Aug 7, 2003 Tide: 4.042 ft Aug 7, 2003 Tide: 3.249 ft Aug 8, 2003 Tide: 2.445 ft Aug 8, 2003 Tide: 1.676 ft Aug 8, 2003 Tide: 0.987 ft Aug 8, 2003 Tide: 0.412 ft Aug 8, 2003 Tide: -0.024 ft Aug 8, 2003 Tide: -0.312 ft Aug 8, 2003 Tide: -0.45 ft Aug 8, 2003 Tide: -0.449 ft Aug 8, 2003 Tide: -0.324 ft Aug 8, 2003 Tide: -0.094 ft Aug 8, 2003 Tide: 0.222 ft Aug 8, 2003 Tide: 0.607 ft Aug 8, 2003 Tide: 1.046 ft Aug 8, 2003 Tide: 1.525 ft Aug 8, 2003 Tide: 2.028 ft Aug 8, 2003 Tide: 2.538 ft Aug 8, 2003 Tide: 3.034 ft Aug 8, 2003 Tide: 3.492 ft Aug 8, 2003 Tide: 3.888 ft Aug 8, 2003 Tide: 4.196 ft Aug 8, 2003 Tide: 4.399 ft Aug 8, 2003 Tide: 4.485 ft Aug 8, 2003 Tide: 4.457 ft Aug 8, 2003 Tide: 4.326 ft Aug 8, 2003 Tide: 4.116 ft Aug 8, 2003 Tide: 3.859 ft Aug 8, 2003 Tide: 3.594 ft Aug 8, 2003 Tide: 3.355 ft Aug 8, 2003 Tide: 3.176 ft Aug 8, 2003 Tide: 3.082 ft Aug 8, 2003 Tide: 3.086 ft Aug 8, 2003 Tide: 3.193 ft Aug 8, 2003 Tide: 3.398 ft Aug 8, 2003 Tide: 3.687 ft Aug 8, 2003 Tide: 4.043 ft Aug 8, 2003 Tide: 4.448 ft Aug 8, 2003 Tide: 4.878 ft Aug 8, 2003 Tide: 5.312 ft Aug 8, 2003 Tide: 5.727 ft Aug 8, 2003 Tide: 6.097 ft Aug 8, 2003 Tide: 6.396 ft Aug 8, 2003 Tide: 6.598 ft Aug 8, 2003 Tide: 6.676 ft Aug 8, 2003 Tide: 6.606 ft Aug 8, 2003 Tide: 6.374 ft Aug 8, 2003 Tide: 5.974 ft Aug 8, 2003 Tide: 5.413 ft Aug 8, 2003 Tide: 4.715 ft Aug 9, 2003 Tide: 3.914 ft Aug 9, 2003 Tide: 3.056 ft Aug 9, 2003 Tide: 2.192 ft Aug 9, 2003 Tide: 1.375 ft Aug 9, 2003 Tide: 0.65 ft Aug 9, 2003 Tide: 0.055 ft Aug 9, 2003 Tide: -0.387 ft Aug 9, 2003 Tide: -0.667 ft Aug 9, 2003 Tide: -0.787 ft Aug 9, 2003 Tide: -0.758 ft Aug 9, 2003 Tide: -0.599 ft Aug 9, 2003 Tide: -0.328 ft Aug 9, 2003 Tide: 0.037 ft Aug 9, 2003 Tide: 0.477 ft Aug 9, 2003 Tide: 0.977 ft Aug 9, 2003 Tide: 1.524 ft Aug 9, 2003 Tide: 2.098 ft Aug 9, 2003 Tide: 2.678 ft Aug 9, 2003 Tide: 3.24 ft Aug 9, 2003 Tide: 3.754 ft Aug 9, 2003 Tide: 4.19 ft Aug 9, 2003 Tide: 4.52 ft Aug 9, 2003 Tide: 4.723 ft Aug 9, 2003 Tide: 4.79 ft Aug 9, 2003 Tide: 4.724 ft Aug 9, 2003 Tide: 4.542 ft Aug 9, 2003 Tide: 4.275 ft Aug 9, 2003 Tide: 3.961 ft Aug 9, 2003 Tide: 3.643 ft Aug 9, 2003 Tide: 3.361 ft Aug 9, 2003 Tide: 3.152 ft Aug 9, 2003 Tide: 3.039 ft Aug 9, 2003 Tide: 3.037 ft Aug 9, 2003 Tide: 3.147 ft Aug 9, 2003 Tide: 3.362 ft Aug 9, 2003 Tide: 3.668 ft Aug 9, 2003 Tide: 4.045 ft Aug 9, 2003 Tide: 4.472 ft Aug 9, 2003 Tide: 4.926 ft Aug 9, 2003 Tide: 5.383 ft Aug 9, 2003 Tide: 5.818 ft Aug 9, 2003 Tide: 6.205 ft Aug 9, 2003 Tide: 6.513 ft Aug 9, 2003 Tide: 6.712 ft Aug 9, 2003 Tide: 6.774 ft Aug 9, 2003 Tide: 6.674 ft Aug 9, 2003 Tide: 6.397 ft Aug 9, 2003 Tide: 5.94 ft Aug 10, 2003 Tide: 5.316 ft Aug 10, 2003 Tide: 4.552 ft Aug 10, 2003 Tide: 3.689 ft Aug 10, 2003 Tide: 2.78 ft Aug 10, 2003 Tide: 1.881 ft Aug 10, 2003 Tide: 1.046 ft Aug 10, 2003 Tide: 0.323 ft Aug 10, 2003 Tide: -0.253 ft Aug 10, 2003 Tide: -0.662 ft Aug 10, 2003 Tide: -0.897 ft Aug 10, 2003 Tide: -0.964 ft Aug 10, 2003 Tide: -0.879 ft Aug 10, 2003 Tide: -0.66 ft Aug 10, 2003 Tide: -0.328 ft Aug 10, 2003 Tide: 0.098 ft Aug 10, 2003 Tide: 0.6 ft Aug 10, 2003 Tide: 1.163 ft Aug 10, 2003 Tide: 1.768 ft Aug 10, 2003 Tide: 2.395 ft Aug 10, 2003 Tide: 3.019 ft Aug 10, 2003 Tide: 3.608 ft Aug 10, 2003 Tide: 4.131 ft Aug 10, 2003 Tide: 4.553 ft Aug 10, 2003 Tide: 4.848 ft Aug 10, 2003 Tide: 4.996 ft Aug 10, 2003 Tide: 4.993 ft Aug 10, 2003 Tide: 4.848 ft Aug 10, 2003 Tide: 4.587 ft Aug 10, 2003 Tide: 4.246 ft Aug 10, 2003 Tide: 3.871 ft Aug 10, 2003 Tide: 3.509 ft Aug 10, 2003 Tide: 3.202 ft Aug 10, 2003 Tide: 2.984 ft Aug 10, 2003 Tide: 2.879 ft Aug 10, 2003 Tide: 2.896 ft Aug 10, 2003 Tide: 3.033 ft Aug 10, 2003 Tide: 3.28 ft Aug 10, 2003 Tide: 3.618 ft Aug 10, 2003 Tide: 4.028 ft Aug 10, 2003 Tide: 4.485 ft Aug 10, 2003 Tide: 4.966 ft Aug 10, 2003 Tide: 5.445 ft Aug 10, 2003 Tide: 5.894 ft Aug 10, 2003 Tide: 6.285 ft Aug 10, 2003 Tide: 6.584 ft Aug 10, 2003 Tide: 6.76 ft Aug 10, 2003 Tide: 6.783 ft Aug 10, 2003 Tide: 6.631 ft Aug 11, 2003 Tide: 6.291 ft
Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.65 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.64 inches Jul-21 Gauge Reading: 4.63 inches Jul-21 Gauge Reading: 4.63 inches Jul-21 Gauge Reading: 4.62 inches Jul-22 Gauge Reading: 4.62 inches Jul-22 Gauge Reading: 4.62 inches Jul-22 Gauge Reading: 4.62 inches Jul-22 Gauge Reading: 4.62 inches Jul-22 Gauge Reading: 4.62 inches Jul-22 Gauge 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Aug-03 Gauge Reading: 4.56 inches Aug-03 Gauge Reading: 4.56 inches Aug-03 Gauge Reading: 4.56 inches Aug-03 Gauge Reading: 4.56 inches Aug-03 Gauge Reading: 4.55 inches Aug-03 Gauge Reading: 4.54 inches Aug-03 Gauge Reading: 4.54 inches Aug-03 Gauge Reading: 4.54 inches Aug-03 Gauge Reading: 4.54 inches Aug-03 Gauge Reading: 4.54 inches Aug-03 Gauge Reading: 4.54 inches Aug-03 Gauge Reading: 4.53 inches Aug-04 Gauge Reading: 4.54 inches Aug-04 Gauge Reading: 4.54 inches Aug-04 Gauge Reading: 4.54 inches Aug-04 Gauge Reading: 4.54 inches Aug-04 Gauge Reading: 4.55 inches Aug-04 Gauge Reading: 4.55 inches Aug-04 Gauge Reading: 4.55 inches Aug-04 Gauge Reading: 4.55 inches Aug-04 Gauge Reading: 4.54 inches Aug-04 Gauge Reading: 4.54 inches Aug-04 Gauge Reading: 4.53 inches Aug-04 Gauge Reading: 4.53 inches Aug-04 Gauge Reading: 4.53 inches Aug-04 Gauge Reading: 4.54 inches

Like other KavaChart objects, you can use "axisStart" and "axisEnd" to provide "hints" about how the axis should scale. In the case of time oriented axes, use "startDate", and "endDate" to provide these hints. You can also supply a "scalingType" to indicate whether increments should occur at minutes, hours, days, etc.

Since the lake water levels stay relatively constant in this chart's display period, we set the Y axis start and end range from 4.0 to 5.0. The default tiny range (4.5 to 4.7) unduly exaggerates the trend.

This chart also reads data from a "customDatasetHandler", to keep the source code to this page brief, but you could easily embed the time stamps and gauge observations into the properties dataset0dateValues and dataset0yValues.