內容

• 特性
• 信號
• 方法
• 詳細描述

ValueAxis QML Type

Adds values to a chart's axes. 更多...

import 語句：	import QtCharts 2.2
實例化：	QValueAxis
繼承：	AbstractAxis

• 所有成員列錶，包括繼承成員

特性

• labelFormat : real
• max : real
• min : real
• minorTickCount : int
• tickCount : int

信號

• rangeChanged (string min , string max )

方法

• applyNiceNumbers ()

詳細描述

The ValueAxis type can be set up to show an axis line with tick marks, grid lines, and shades. The values on the axis are drawn at the positions of tick marks.

以下範例代碼闡明如何使用 ValueAxis 類型：

ChartView {
    ValueAxis {
        id: xAxis
        min: 0
        max: 10
    }
// Add a few series...
}
					

特性文檔編製

labelFormat : real

格式字符串支持的以下轉換說明符、長度修飾符和標誌的提供通過 printf() 在標準 C++ 庫：d、i、o、x、X、f、F、e、E、g、G、c。

若 ChartView.localizeNumbers is true ，支持的說明符限於：d、e、E、f、g、G 和 i。另外，僅支持精度修飾符。其餘格式來自默認 QLocale 對於應用程序。

另請參閱 QString::asprintf() .

max : real

The maximum value on the axis.

When setting this property, the minimum value is adjusted if necessary, to ensure that the range remains valid.

min : real

The minimum value on the axis.

When setting this property, the maximum value is adjusted if necessary, to ensure that the range remains valid.

minorTickCount : int

The number of minor tick marks on the axis. This indicates how many grid lines are drawn between major ticks on the chart. Labels are not drawn for minor ticks. The default value is 0.

tickCount : int

The number of tick marks on the axis. This indicates how many grid lines are drawn on the chart. The default value is 5, and the number cannot be less than 2.

信號文檔編製

rangeChanged ( string min , string max )

此信號發射，當 min or max value of the axis changes.

The corresponding signal handler is onRangeChanged .

方法文檔編製

applyNiceNumbers ()

修改軸的當前範圍和刻度標記數，以使看起來 nice . The algorithm considers numbers that can be expressed as a form of 1*10^n, 2* 10^n, or 5*10^n to be nice numbers. These numbers are used for setting spacing for the tick marks.