內容

特性
信號
方法
詳細描述

AbstractBarSeries QML Type

An abstract parent type for all bar series types. 更多...

import 語句：	import QtCharts 2.3
實例化：	QAbstractBarSeries
繼承：	AbstractSeries
繼承者：	BarSeries , HorizontalBarSeries , HorizontalPercentBarSeries , HorizontalStackedBarSeries , PercentBarSeries ，和 StackedBarSeries

所有成員列錶，包括繼承成員

特性

axisX : AbstractAxis
axisXTop : AbstractAxis
axisY : AbstractAxis
axisYRight : AbstractAxis
barWidth : real
count : int
labelsAngle : real
labelsFormat : string
labelsPosition : enumeration
labelsPrecision : real
labelsVisible : bool

信號

barsetsAdded ()
barsetsRemoved ()
clicked (int index , BarSet barset )
doubleClicked (int index , BarSet barset )
hovered (bool status , int index , BarSet barset )
pressed (int index , BarSet barset )
released (int index , BarSet barset )

方法

BarSet append (string label , VariantList values )
BarSet at (int index )
clear ()
BarSet insert (int index , string label , VariantList values )
bool remove (BarSet barset )

詳細描述

In bar charts, bars are defined as bar sets that contain one data value for each category. The position of a bar is specified by the category and its height by the data value. Bar series that contain multiple bar sets group together bars that belong to the same category. The way the bars are displayed is determined by the type chosen to create the bar chart: BarSeries , StackedBarSeries , PercentBarSeries , HorizontalBarSeries , HorizontalStackedBarSeries ，或 HorizontalPercentBarSeries .

若 ValueAxis type is used instead of a BarCategoryAxis type for the main bar axis, the bars are grouped around the index value of the category.

The following QML code snippet shows how to use the BarSeries and BarCategoryAxis type to create a simple bar chart:

ChartView {
    title: "Bar series"
    anchors.fill: parent
    legend.alignment: Qt.AlignBottom
    antialiasing: true
    BarSeries {
        id: mySeries
        axisX: BarCategoryAxis { categories: ["2007", "2008", "2009", "2010", "2011", "2012" ] }
        BarSet { label: "Bob"; values: [2, 2, 3, 4, 5, 6] }
        BarSet { label: "Susan"; values: [5, 1, 2, 4, 1, 7] }
        BarSet { label: "James"; values: [3, 5, 8, 13, 5, 8] }
    }
}

特性文檔編製

axisX : AbstractAxis

The x-axis used for the series. If you leave both axisX and axisXTop undefined, a BarCategoryAxis is created for the series.

另請參閱 axisXTop .

axisXTop : AbstractAxis

The x-axis used for the series, drawn on top of the chart view.

注意： You can only provide either axisX or axisXTop, but not both.

另請參閱 axisX .

axisY : AbstractAxis

The y-axis used for the series. If you leave both axisY and axisYRight undefined, a ValueAxis is created for the series.

另請參閱 axisYRight .

axisYRight : AbstractAxis

The y-axis used for the series, drawn to the right of the chart view.

注意： You can only provide either axisY or axisYRight, but not both.

另請參閱 axisY .

barWidth : real

寬度單位是 X 軸的單位。條形的最小寬度為 0，且負值被視為 0。將寬度設為 0 意味著屏幕中的條形寬度為 1 像素，不管 X 軸的刻度。寬於 0 的條形按 X 軸的刻度比例縮放。

注意： When used with the BarSeries type, this value specifies the width of a group of bars instead of that of a single bar.

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.

另請參閱 QAbstractBarSeries::labelsFormat , labelsVisible ，和 labelsPosition .

labelsPosition : enumeration

The position of the data value labels:

常量	描述
`AbstractBarSeries.LabelsCenter`	Label is located in the center of the bar.
`AbstractBarSeries.LabelsInsideEnd`	Label is located inside the bar at the top.
`AbstractBarSeries.LabelsInsideBase`	Label is located inside the bar at the bottom.
`AbstractBarSeries.LabelsOutsideEnd`	Label is located outside the bar at the top.

另請參閱 labelsVisible and labelsFormat .

labelsPrecision : real

The maximum amount of significant digits shown in value labels.

默認值為 6。

labelsVisible : bool

The visibility of the labels in a bar series.

信號文檔編製

barsetsAdded ()

This signal is emitted when bar sets are added to the series.

The corresponding signal handler is onBarsetsAdded .

barsetsRemoved ()

This signal is emitted when bar sets are removed from the series.

The corresponding signal handler is onBarsetsRemoved .

clicked ( int index , BarSet barset )

This signal is emitted when the user clicks the bar specified by index in the bar set specified by barset .

The corresponding signal handler is onClicked .

doubleClicked ( int index , BarSet barset )

This signal is emitted when the user double-clicks the bar specified by index in the bar set specified by barset .

The corresponding signal handler is onDoubleClicked .

hovered ( bool status , int index , BarSet barset )

This signal is emitted when a mouse is hovered over the bar specified by index in the bar set specified by barset . When the mouse moves over the bar, status turns true , and when the mouse moves away again, it turns false .

The corresponding signal handler is onHovered .

pressed ( int index , BarSet barset )

This signal is emitted when the user clicks the bar specified by index in the bar set specified by barset and holds down the mouse button.

The corresponding signal handler is onPressed .

released ( int index , BarSet barset )

This signal is emitted when the user releases the mouse press on the bar specified by index in the bar set specified by barset .

The corresponding signal handler is onReleased .

方法文檔編製

BarSet append ( string label , VariantList values )

Adds a new bar set with label and values to the index. values is a list of real values.

例如：

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 at index . Returns null if the index is not valid.

clear ()

Removes all bar sets from the series.

BarSet insert ( int index , string label , VariantList values )

Adds a new bar set with label and values to index . values can be a list of real values or a list of XYPoint 類型。

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.

另請參閱 append() .

bool remove ( BarSet barset )

Removes the bar set specified by barset from the series. Returns true 若成功， false 否則。