BarSeries QML Type
Presents data in bar graphs. More...
| Import Statement: | import QtGraphs |
| In C++: | QBarSeries |
| Inherits: |
- List of all members, including inherited members
- BarSeries is part of Qt Graphs QML Types for 2D.
Properties
- barDelegate : Component
- barSets : list<BarSet>
- barWidth : real
- barsType : enumeration
- borderColors : list<color>
- count : int
- labelsAngle : real
- labelsFormat : string
- labelsMargin : real
- labelsPosition : enumeration
- labelsPrecision : real
- labelsVisible : bool
- seriesColors : list<color>
Signals
Methods
- BarSet append(string label, VariantList values)
- BarSet at(int index)
- Barset at(int index)
- clear()
- int find(BarSet barset)
- BarSet insert(int index, string label, VariantList values)
- bool remove(BarSet barset)
- bool remove(int index)
- removeMultiple(int index, int count)
- bool replace(list<BarSet> sets)
- bool replace(BarSet oldSet, BarSet newSet)
- bool replace(int index, BarSet barset)
Detailed Description
Draws data by default as a series of bars grouped by category, with one bar per category from each bar set added to the series. It also supports horizontal bars and grouping bars as stacked.
Property Documentation
barDelegate : Component |
A custom QML component used for visualizing each of the bars. Instance of this component is created for each of the bar. When this is not defined, a default rectangle visualization for bars is used.
The dynamic properties available for this component are:
| Type | Name | Description |
|---|---|---|
| color | barColor | The fill color of the bar. This value comes either from the GraphsTheme or from BarSet::color if the BarSet overrides the color. |
| color | barBorderColor | The border color of the bar. This value comes either from the GraphsTheme or from BarSet::borderColor if the BarSet overrides the color. |
| real | barBorderWidth | The width of the bar border. This value comes either from the GraphsTheme or from BarSet::borderWidth if the BarSet overrides the width. |
| real | barValue | The value of the bar. This value comes from the BarSet::values. |
| string | barLabel | The label of the bar. This value comes from the BarSet::label. |
| bool | barSelected | This value is true when the bar is selected, meaning that the bar index is in BarSet::selectedBars. |
To use any of these, add property with the defined name into your custom component. For example "property color barColor" and "property real barValue".
barWidth : real |
The unit of width is the unit of the x-axis. The minimum width for bars is zero, and negative values are treated as zero. Setting the width to zero means that the width of the bar on the screen is one pixel regardless of the scale of the x-axis. Bars wider than zero are scaled using the x-axis scale.
By default, the barWidth is 0.5 (bars will take 50% of the available width). The valid values range from 0.0 (0%) to 1.0 (100%).
Note: When used with the BarSeries type, this value specifies the width of a group of bars instead of that of a single bar.
barsType : enumeration |
The type of the bar series:
| Constant | Description |
|---|---|
BarSeries.BarsType.Groups | Bar sets are grouped by category. This is the default value. |
BarSeries.BarsType.Stacked | Bar sets are stacked after each other by category. |
BarSeries.BarsType.StackedPercent | Bar sets are stacked after each other by category. The segment size corresponds to the percentage of the segment value compared with the total value of all segments in the stack. |
The list of border colors to be used for all the objects in the series.
If there are more series than colors, the color list wraps and starts again with the first color in the list. If this is not set (default), colors from the GraphsTheme::borderColors will be used.
count : int |
The number of bar sets in a bar series.
labelsAngle : real |
The angle of the value labels in degrees.
labelsFormat : string |
The format used for showing labels in a bar series.
See also QBarSeries::labelsFormat, labelsVisible, and labelsPosition.
labelsMargin : real |
The margin of the value labels in pixels.
This margin from side is used when labelsPosition is set to something else than LabelsPosition.Center. The default value is 0.
labelsPosition : enumeration |
The position of the data value labels:
| Constant | Description |
|---|---|
BarSeries.LabelsPosition.Center | Label is located in the center of the bar. |
BarSeries.LabelsPosition.InsideEnd | Label is located inside the bar at the top. |
BarSeries.LabelsPosition.InsideBase | Label is located inside the bar at the bottom. |
BarSeries.LabelsPosition.OutsideEnd | Label is located outside the bar at the top. |
See also labelsVisible and labelsFormat.
labelsPrecision : real |
The maximum amount of significant digits shown in value labels.
Default value is 6.
labelsVisible : bool |
The visibility of the labels in a bar series. The default label visibility is false.
The list of base colors to be used for all the objects in the series.
If there are more series than colors, the color list wraps and starts again with the first color in the list. If this is not set (default), colors from the GraphsTheme::seriesColors will be used.
Signal Documentation
barsetsAdded() |
This signal is emitted when bar sets are added to the series.
Note: The corresponding handler is onBarsetsAdded.
barsetsRemoved() |
This signal is emitted when bar sets are removed from the series.
Note: The corresponding handler is onBarsetsRemoved.
Method Documentation
Adds a new bar set with label and values to the index. values is a list of real values.
For example:
myBarSeries.append("set 1", [0, 0.2, 0.2, 0.5, 0.4, 1.5, 0.9]);
Barset at(int index) |
Returns the bar set specified by index from the series. Returns null otherwise.
clear() |
Removes all bar sets from the series.
Returns the index of the bar set specified by barset from the series. Returns -1 if not found.
Adds a new bar set with label and values to index. values can be a list of real values or a list of XYPoint types.
If the index value is equal to or less than zero, the new bar set is prepended to the bar series. If the index value is equal to or greater than the number of bar sets in the bar series, the new bar set is appended to the bar series.
See also append().
Removes the bar set specified by barset from the series. Returns true if successful, false otherwise.
Removes the bar set specified by index from the series. Returns true if the removal was successful, false otherwise.
Removes a range of bar sets as specified by the index and count. The call traverses over all sets even if removal of one fails.
Completely replaces all current bar set with sets. The size does not need to match. Returns false if any of the bar set in sets are invalid.
Replaces the bar set specified by oldSet with newSet. Returns true if the removal was successful, false otherwise. oldSet is destroyed if this is successful.
Replaces the bar set at the position specified by index from the series and replaces it with barset. Returns true if successful, false otherwise.
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