Web > Charts > Chart Type Walkthroughs > Cartesian

Area Chart of a Daily High-Low Range

Known issues

Some chart features have known issues in the current release. See Known issues.

This walkthrough fills the band between each day's high and low price, answering "How wide was the daily trading range?"

Prerequisites

• Editor mode: click once on the screen, then press Ctrl+d. The AMIDB Shell Tool and the gallery are used as in the quickstart.
• Data: the example data that stage 1 creates. To use a table of your own instead, see With your own data.

1. Create the example data

The chart reads a table in the Center, so create the table first.

1. Select Dashboard -> AMIDB Shell Tool....

2. Run:

   CREATE PUBLIC TABLE ChartDemoDaily (Day UTC, Open Double, High Double, Low Double, Close Double);
   INSERT INTO ChartDemoDaily VALUES
    (parseDate("2026-09-28", "yyyy-MM-dd", "EST5EDT"), 410.2, 415.0, 408.1, 413.5),
    (parseDate("2026-09-29", "yyyy-MM-dd", "EST5EDT"), 413.5, 418.2, 412.0, 417.9),
    (parseDate("2026-09-30", "yyyy-MM-dd", "EST5EDT"), 417.9, 419.5, 411.3, 412.4),
    (parseDate("2026-10-01", "yyyy-MM-dd", "EST5EDT"), 412.4, 414.8, 405.6, 407.0),
    (parseDate("2026-10-02", "yyyy-MM-dd", "EST5EDT"), 407.0, 411.9, 406.2, 410.8),
    (parseDate("2026-10-05", "yyyy-MM-dd", "EST5EDT"), 410.8, 421.3, 410.1, 420.6),
    (parseDate("2026-10-06", "yyyy-MM-dd", "EST5EDT"), 420.6, 424.0, 417.2, 418.1),
    (parseDate("2026-10-07", "yyyy-MM-dd", "EST5EDT"), 418.1, 419.0, 409.9, 411.2),
    (parseDate("2026-10-08", "yyyy-MM-dd", "EST5EDT"), 411.2, 416.7, 410.4, 415.9),
    (parseDate("2026-10-09", "yyyy-MM-dd", "EST5EDT"), 415.9, 422.8, 414.6, 421.7);
   SELECT * FROM ChartDemoDaily;
   

3. Check that the lower pane shows the 10 rows.

The dates are stored at midnight New York time, the default user time zone, so each one falls on its own day. See Dates on an axis.

2. Create the chart

The gallery creates a datamodel that reads the table, then places the chart.

1. Select Windows -> New Window, then the edit button on Blank1, then "Create Table / Visualization / Form".
2. Select "AMI (__AMI)", then "Next >>".
3. Select the "USER" tile ChartDemoDaily, then "Next >>".
4. Select "Test (alt+enter)", then "Next >>".
5. Select the "Cartesian" tab, then the "Area Chart" tile.

6. Set the fields below the tiles:

   Field	Value
   "X Axis:"	Day
   "Top:"	High
   "Bottom:"	Low
   "Order by:"	Day

7. Select "Finish".

8. Check that the window shows a filled band whose top runs through the highs, from 411.9 to 424.0, and whose bottom runs through the lows, 405.6 to 417.2.

Result

A band between two lines over Sep 28 to Oct 9. The value axis runs from about 405 to 425, not from 0; its exact ends depend on the chart's size.

To check without looking, read the render stats: session.getDevTools().getAllRenderStats() in the AMIDB Shell Tool, with "Run on this web session" selected (see Running a script), or web_debug op=panelRenderStats over MCP. The layer reports Rows 10 and an empty Problem, and the vertical axis a min near 405 and a max near 425.

With your own data

The chart needs one row per x value, with the top and the bottom of the area in two number columns. In stage 2, select the "USER" tile of your table in place of ChartDemoDaily, and map your columns to the fields in stage 2's field table. Stage 2's check quotes the example data; on yours, check the same features against your own values. To filter rows, or to total raw rows first, see Using your own data.

Over MCP

An agent builds the same chart from the same table. Connecting an agent is covered in the AI section; the tools are on Building charts over MCP.

1. Create the datamodel with web_execute op=importDatamodel and this dmJson, then run it once with op=initDatamodelSchema and dmName ChartDemoDaily:

   {"id": "ChartDemoDaily", "queryMode": "startup", "callbacks": [{"name": "onProcess", "amiscript": ["{ CREATE TABLE ChartDemoDaily AS USE ds=\"AMI\" EXECUTE SELECT * FROM ChartDemoDaily; }"]}]}
   

2. Create the chart:

   {"windowName": "ChartDemoArea", "datamodelId": "ChartDemoDaily", "dmTable": "ChartDemoDaily", "chartType": "area", "xField": "Day", "yField": "High", "title": "ChartDemoArea", "logScale": ""}
   

3. Run the datamodel again with web_execute op=executeDatamodel, dmName ChartDemoDaily. A chart created over MCP can stay empty until its datamodel runs again, with its axes at 0-100.

4. Confirm that every layer reports the rows above and an empty Problem: run web_debug op=panelRenderStats.

The call is web_create_chart, which fills from 0 up to yField. To fill down to the low instead, set the layer's bottom field from AmiScript with web_script, then run the datamodel again:

ChartPanelLayer l = ((ChartPanel) layout.getPanel("ChartDemoArea")).getPlot(0, 0).getLayer(0);
l.setFormula("y2Pos", "Low");

Removing the example

Remove the chart, then its datamodel, then the table, so that the next walkthrough can reuse the names:

1. Close the chart's window with its close button, and select "Delete" when asked whether to delete the panel.
2. Select Dashboard -> Data Modeler..., expand "Datamodels", right-click the chart's datamodel, ChartDemoDaily, and select "Delete Datamodel", then "Yes". If that name was taken when stage 2 ran, the gallery added a number to it, as in ChartDemoDaily1.
3. Run DROP TABLE ChartDemoDaily; in the AMIDB Shell Tool.
4. Check that SELECT * FROM ChartDemoDaily; reports Unknown table: ChartDemoDaily.

Over MCP, delete the chart with web_danger op=deletePanel, then the datamodel with op=deleteDatamodel, dmName ChartDemoDaily, and drop the table as in step 3. deleteDatamodel refuses a datamodel that has been committed; delete that one in the Data Modeler as in step 2. See Removing an agent's chart.