Bar （进度条）(lv_bar)

Overview（概述）

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The bar object has a background and an indicator on it. The width of the indicator is set according to the current value of the bar.

Vertical bars can be created if the width of the object is smaller than its height.

Not only the end, but also the start value of the bar can be set, which changes the start position of the indicator.

进度条对象有一个背景，并且上面有一个指示器。指示器的宽度根据进度条的当前值自动设置。

如果设置进度条的宽度小于其高度，就可以创建出垂直摆放的进度条。

不仅可以设置进度条的结束值，还可以设置进度条的起始值，从而改变指示器的起始位置。

Parts and Styles（零件和样式）

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LV_PART_MAIN The background of the bar and it uses the typical background style properties. Adding padding makes the indicator smaller or larger. The anim_time style property sets the animation time if the values set with LV_ANIM_ON.
LV_PART_INDICATOR The indicator itself; also uses all the typical background properties.

LV_PART_MAIN 进度条的背景，它使用典型的背景样式属性。增加内边距会使指示器更小或更大。如果值设置为 LV_ANIM_ON，则可以继续通过设置 anim_time 样式属性设置动画的时间。
LV_PART_INDICATOR 指示器本身;也使用了所有典型的背景属性。

Usage（用法）

Value and range（值和范围）

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A new value can be set by lv_bar_set_value(bar, new_value, LV_ANIM_ON/OFF). The value is interpreted in a range (minimum and maximum values) which can be modified with lv_bar_set_range(bar, min, max). The default range is 0..100, and the default drawing direction is from left to right in horizontal mode and bottom to top in vertical mode. If the minimum value is greater than the maximum value, like 100..0, the drawing direction changes to the opposite direction.

The new value in lv_bar_set_value() can be set with or without an animation depending on the last parameter (LV_ANIM_ON/OFF).

可以通过 lv_bar_set_value(bar, new_value, LV_ANIM_ON/OFF) 设置新值。值在范围（最小值和最大值）中解读，该范围可以使用 lv_bar_set_range(bar, min, max) 修改。默认范围为 0..100，默认绘制方向为水平模式下从左到右和垂直模式下从下到上。如果最小值大于最大值，例如 100..0，绘图方向变为相反方向。

使用 lv_bar_set_value() 设置的新值可以通过其最后的一个参数 (LV_ANIM_ON/OFF) 来决定是否设置动画。

Modes（模式）

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The bar can be one of the following modes:

LV_BAR_MODE_NORMAL A normal bar as described above
LV_BAR_MODE_SYMMETRICAL Draw the indicator from the zero value to current value. Requires a negative minimum range and positive maximum range.
LV_BAR_MODE_RANGE Allows setting the start value too by lv_bar_set_start_value(bar, new_value, LV_ANIM_ON/OFF). The start value always has to be smaller than the end value.

该进度条可以是以下模式之一：

LV_BAR_MODE_NORMAL 如上所述的普通进度条(默认)
LV_BAR_MODE_SYMMETRICAL 将指示器从零值绘制为当前值。需要一个负的最小范围和正的最大范围。
LV_BAR_MODE_RANGE 这个模式下也可以指定负的最小范围。这样进度条的起始值可以不是0，而是你指定的数值(参考示例)，但是这样设置的起始值 lv_bar_set_start_value(bar, new_value, LV_ANIM_ON/OFF) 必须小于结束值。