就业培训     下载中心     Wiki     联络 登录   注册
  1. 首页
  2. Qt 5.15.17
  3. Qt Charts
  4. QML 类型
  5. AbstractBarSeries QML Type

AbstractBarSeries QML Type

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

import 语句： import QtCharts 2.15
实例化： QAbstractBarSeries
继承：

AbstractSeries

继承者：

BarSeries , HorizontalBarSeries , HorizontalPercentBarSeries , HorizontalStackedBarSeries , PercentBarSeries ，和 StackedBarSeries

特性

信号

方法

详细描述

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] }
    }
}

特性文档编制

axisX : AbstractAxis

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

另请参阅 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.

另请参阅 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.

另请参阅 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.

另请参阅 axisY .

barWidth : real

宽度单位是 X 轴的单位。条形的最小宽度为 0，且负值被视为 0。将宽度设为 0 意味着屏幕中的条形宽度为 1 像素，不管 X 轴的刻度。宽于 0 的条形按 X 轴的刻度比例缩放。

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.

另请参阅 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.

另请参阅 labelsVisible and labelsFormat .

labelsPrecision : real

The maximum amount of significant digits shown in value labels.

默认值为 6。

labelsVisible : bool

The visibility of the labels in a bar series.

信号文档编制

barsetsAdded ()

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

The corresponding signal handler is onBarsetsAdded .

注意： 相应处理程序是 onBarsetsAdded .

barsetsRemoved ()

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

The corresponding signal handler is onBarsetsRemoved .

注意： 相应处理程序是 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 .

注意： 相应处理程序是 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 .

注意： 相应处理程序是 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 .

注意： 相应处理程序是 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 .

注意： 相应处理程序是 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 .

注意： 相应处理程序是 onReleased .

方法文档编制

BarSet append ( string label , VariantList 值 )

Adds a new bar set with label and 值 to the index. 值 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 值 )

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

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.

另请参阅 append() .

bool remove ( BarSet barset )

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

内容