mirror of
https://gitee.com/zlgopen/awtk.git
synced 2024-12-05 13:38:15 +08:00
166 lines
4.1 KiB
Markdown
166 lines
4.1 KiB
Markdown
# 如何使用 packed 图片
|
||
|
||
## 1. 介绍
|
||
|
||
有时我们把多张小图片打包成一张大图片,这种做法在游戏行业和串口屏经常使用。这样做有以下几个原因:
|
||
|
||
* 美术做图方便。
|
||
|
||
* 现存的资源就是这样,懒得去切图。
|
||
|
||
* 在有 GPU 的时候,可以在一定程度提高性能。
|
||
|
||
最新的 AWTK 对 packed 图片提供了支持。本文介绍一下如何使用 packed 的图片。
|
||
|
||
## 2. 如何指定 packed 图片中的子图
|
||
|
||
在 style 中指定图片名称时,用#分隔图片名称和子图区域。指定子图区域的方式有以下几种:
|
||
|
||
* 空字符串。表示使用控件当前的 xywh 来决定子图的位置和大小。如:
|
||
|
||
```
|
||
<pressed bg_image="image_packed_fg#"/>
|
||
```
|
||
|
||
> 如果当前控件的区域是 (10, 20, 30, 40),那么子图的区域也是 (10, 20, 30, 40)。
|
||
|
||
* g。表示使用控件当前的 xywh 来决定子图的位置和大小,xy 转换成全局坐标。如:
|
||
|
||
```
|
||
<pressed bg_image="image_packed_fg#g"/>
|
||
```
|
||
|
||
> 如果当前控件的区域是 (10, 20, 30, 40),相对于窗口的坐标是 50, 60,那么子图的区域就是 (50, 60, 30, 40)。
|
||
|
||
* xywh(x,y,w,h) 指定子图的绝对坐标。如:
|
||
|
||
```
|
||
<pressed bg_image="image_packed_fg#xywh(106,0,106,54)"/>
|
||
```
|
||
> 那么子图的区域就是 (106,0,106,54)
|
||
|
||
* grid(rows,cols,row,col) 将图片划分为 rows 行 cols 列等大小的网格。row 和 col 指定使用哪一格的子图。如:
|
||
|
||
```
|
||
<pressed bg_image="image_packed_fg#grid(4,3,0,2)"/
|
||
```
|
||
|
||
> 如果图片大小是 80x60,那么子图的区域就是 (40,0,20,20)
|
||
|
||
## 3. 示例
|
||
|
||
这里有两张图片:
|
||
|
||
* 正常时的效果
|
||
|
||
![](../design/default/images/xx/image_packed_bg.jpg)
|
||
|
||
* 按下时的效果
|
||
|
||
![](../design/default/images/xx/image_packed_fg.jpg)
|
||
|
||
> 两张图看起来有些相近,第二张是把第一张调暗后得到的,不过运行起来后按下效果很明显的。
|
||
|
||
### 3.1 UI 文件
|
||
|
||
```xml<window>
|
||
<window>
|
||
<view style="image_packed" x="c" y="m" w="320" h="216" children_layout="default(r=4,c=3)">
|
||
<button style="num_1"/>
|
||
<button style="num_2"/>
|
||
<button style="num_3"/>
|
||
<button style="num_4"/>
|
||
<button style="num_5"/>
|
||
<button style="num_6"/>
|
||
<button style="num_7"/>
|
||
<button style="num_8"/>
|
||
<button style="num_9"/>
|
||
<button style="dot"/>
|
||
<button style="num_0"/>
|
||
<button style="backspace"/>
|
||
</view>
|
||
</window>
|
||
```
|
||
|
||
### 3.2 Style 文件
|
||
|
||
* 使用第一张图为 view 的背景图。按钮在正常情况什么都不用显示。
|
||
|
||
* 按钮在 pressed 状态下背景用指定区域的图片。
|
||
|
||
* 本例子演示来各种用法。通常使用缺省用法即可:
|
||
|
||
```
|
||
<pressed bg_image="image_packed_fg#" />
|
||
```
|
||
|
||
```xml
|
||
<button>
|
||
<style name="num_1">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#xywh(0,0,106,54)" />
|
||
</style>
|
||
<style name="num_2">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#xywh(106,0,106,54)" />
|
||
</style>
|
||
<style name="num_3">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#grid(4,3,0,2)" />
|
||
</style>
|
||
<style name="num_4">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#grid(4,3,1,0)" />
|
||
</style>
|
||
<style name="num_5">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#grid(4,3,1,1)" />
|
||
</style>
|
||
<style name="num_6">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#grid(4,3,1,2)" />
|
||
</style>
|
||
<style name="num_7">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#grid(4,3,2,0)" />
|
||
</style>
|
||
<style name="num_8">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#grid(4,3,2,1)" />
|
||
</style>
|
||
<style name="num_9">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#grid(4,3,2,2)" />
|
||
</style>
|
||
<style name="dot">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#" />
|
||
</style>
|
||
<style name="num_0">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#" />
|
||
</style>
|
||
<style name="backspace">
|
||
<normal />
|
||
<pressed bg_image="image_packed_fg#" />
|
||
</style>
|
||
</button>
|
||
<view>
|
||
<style name="image_packed">
|
||
<normal bg_image="image_packed_bg" />
|
||
</style>
|
||
</view>
|
||
```
|
||
|
||
### 3.3 运行示例
|
||
|
||
```
|
||
./bin/preview_ui design/default/ui/image_packed.xml
|
||
```
|
||
|
||
## 4. 限制
|
||
|
||
* 目前只能在 style 中使用。
|
||
|
||
* draw\_type 只支持 default|scale|center|icon 等几种。
|