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56 lines
4.4 KiB
XML
56 lines
4.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<fpdoc-descriptions>
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<package name="TAChartLazarusPkg">
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<module name="TAChartAxis">
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<element name="TChartAxisTitle">
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<short>The title of an axis</short>
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</element>
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<element name="TChartAxisTitle.Caption">
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<short>Caption texts</short>
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</element>
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<element name="TChartAxisTitle.Distance">
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<short>The distance between the title text and axis marks</short>
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</element>
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<element name="TChartAxisTitle.Font">
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<short>Title font</short>
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<descr>
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<var>Font.Orientation</var> is by default set to 900 (90 degrees to the left)
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for vertical axises.</descr>
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</element>
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<element name="TChartAxisTitle.Visible">
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<short>Title is shown if <var>Visible</var> is true and <var>Caption</var> is not empty</short>
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</element>
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<element name="TChartAxis.Alignment">
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<short>Determines the side of the chart to which the axis is aligned</short>
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<descr>Left- and right-aligned axises are vertical, top- and bottom-aligned axises are horizontal.
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</descr>
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</element>
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<element name="TChartAxis.Grid">
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<short>Pen used for grid drawing</short>
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<descr>Grid lines are drawn across the chart from each axis mark</descr>
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</element>
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<element name="TChartAxis.Inverted"><short>Inverts the axis scale from increasing to decreasing.</short>
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</element>
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<element name="TChartAxis.Visible">
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<short>If true, the axis is drawn on the chart</short>
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<descr>Invisible axis might still be used for series transformation</descr>
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</element>
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<element name="TChartAxisMarks.Source">
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<short>Source of mark positions</short>
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<descr>
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<p>If the source is set, marks are determined by <var>X</var> or <var>Y</var> coordinates
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of <var>Source</var> items for horizontal and vertical axises correspondingly.
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</p>
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<p>Otherwise, marks are created automatically.</p>
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</descr>
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</element>
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<element name="TChartAxis">
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<short>Axis of a chart</short>
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<descr><p>TAChart uses four coordinate systems:</p><ul><li><b>Axis coordinates</b> (known in some other applications as object coordinates) -- this is the "raw" coordinate values obtained from the data. As the name implies, axis coordinates are interpreted in terms of specific axis -- the same coordinate value may have different meaning depending on the axis it is applied to.</li><li><b>Graph coordinates</b> are converted from the axis coordinates using axis transformations, such as logarithmic scale. Graph coordinates are common for all objects in the chart.</li><li><b>Image coordinates</b> (aka screen coordinates) are converted from graph coordinates based on the chart viewport. This transformation is always linear and can be influenced by chart tools such as zooming and panning.</li><li><b>Device coordinates</b> are usually equal to screen coordinates, but may be adjusted to the drawing back-end to accommodate different physical resolutions (DPI values). See, for example, printer drawer.</li>
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</ul><p>You can add or remove an arbitrary number of axes by editing the <link id="TAGraph.TChart.AxisList">AxisList</link> property of the chart. By default, a chart has two axes: one horizontal and one vertical. They are accessible via the <link id="TAGraph.TChart.BottomAxis">BottomAxis</link> and <link id="TAGraph.TChart.LeftAxis">LeftAxis</link> properties. Note that those properties are aliases to <var>AxisList[0]</var> and <var>AxisList[1]</var>, so if you remove those default axes, accessing <var>BottomAxis</var> and <var>LeftAxis</var> will return nil.</p><p>Visually, an axis consists of the axis line (drawn by <link id="TAxisPen">AxisPen</link>), grid lines (drawn by <link id="TGridPen">GridPen</link>), ticks, marks and an arrow.</p><p>Each axis is drawn inside its own rectangle, determined by the size of mark labels and ticks. By assigning several axes the same positive <var>Group</var> number, you can have them share the same rectangular area. Grouped axes can be used to achieve a "panes" look, when several series are drawn on different portions of the same graph.</p><p>Axes with the same alignment, but different groups, are stacked alongside each other. You can use the <var>Margin</var> property to control the spacing between such axes. </p>
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</descr>
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</element>
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</module>
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</package>
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</fpdoc-descriptions>
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