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id="lvgl-hw-decoder-d5856e4796-link">硬件解码对接</a></div></div></li><li role="treeitem"><div data-tocid="lvgl-freetype-d5856e4808" class="topicref" data-id="lvgl-freetype" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl-freetype.html" id="lvgl-freetype-d5856e4808-link">第三方 FreeType 库支持</a></div></div></li><li role="treeitem" class="active"><div data-tocid="lvgl-demo-d5856e4820" class="topicref" data-id="lvgl-demo" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl-demo.html" id="lvgl-demo-d5856e4820-link">LVGL Demo</a></div></div></li></ul></li><li role="treeitem"><div data-tocid="id-d5856e4832" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl_add_app.html" id="id-d5856e4832-link">添加应用</a></div></div></li><li role="treeitem"><div data-tocid="id-d5856e4844" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl_special_func.html" id="id-d5856e4844-link">屏幕旋转</a></div></div></li><li role="treeitem"><div data-tocid="id-d5856e4856" class="topicref" data-id="id" data-state="leaf"><span role="button" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/sdk/lvgl/lvgl_faq.html" id="id-d5856e4856-link">常见问题</a></div></div></li></ul></li></ul></li><li role="treeitem" aria-expanded="false"><div data-tocid="concept_nww_hzh_pzb-d5856e4868" class="topicref" data-id="concept_nww_hzh_pzb" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action concept_nww_hzh_pzb-d5856e4868-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-interface-sdk.html" id="concept_nww_hzh_pzb-d5856e4868-link">接口</a><div class="wh-tooltip"><p class="shortdesc">CAN<span class="ph">、CAP</span>、CIR、GPAI、GPIO、I2C、PSADC、PWM 等接口模块的介绍和使用说明。</p></div></div></div></li><li role="treeitem" aria-expanded="false"><div data-tocid="chapter-safety-d5856e6083" class="topicref" data-id="chapter-safety" data-state="not-ready"><span role="button" tabindex="0" aria-labelledby="button-expand-action chapter-safety-d5856e6083-link" class="wh-expand-btn"></span><div class="title"><a href="../../../topics/chapter-title/chapter-safety-sdk.html" id="chapter-safety-d5856e6083-link">安全</a><div class="wh-tooltip"><p class="shortdesc">SPI ENC、CE、eFuse 等安全模块的介绍和使用说明。</p></div></div></div></li></ul></li></ul></div>
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<div class=" wh_topic_content body "><main role="main"><article class="- topic/topic concept/concept topic concept" role="article" aria-labelledby="ariaid-title1"><span class="edit-link" style="font-size:12px; opacity:0.6; text-align:right; vertical-align:middle"><a target="_blank" href="http://172.16.35.88/tasks/jdssno1uvvbf2mltu9kb9v3if05d5gopuakboe8hlud18rma/edit/F:/aicdita/aicdita-cn/topics/sdk/lvgl/lvgl-demo.dita">Edit online</a></span><h1 class="- topic/title title topictitle1" id="ariaid-title1">LVGL Demo</h1><div class="date inPage">15 Jan 2024</div><div style="color: gray;">
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Read time: 5 minute(s)
|
||
</div><div class="- topic/body concept/conbody body conbody"><div class="- topic/p p" data-ofbid="d308076e24__20250121171814">LVGL demo 示例目前支持下列常见的示例：<ul class="- topic/ul ul" id="lvgl-demo__ul_orj_z3h_fdc" data-ofbid="lvgl-demo__ul_orj_z3h_fdc"><li class="- topic/li li" data-ofbid="d308076e27__20250121171814"><a class="- topic/xref xref" href="lvgl-demo.html#lvgl-demo__section_fyy_jjh_fdc">Base Demo</a>：LVGL 的基础演示示例，展示了如何使用 LVGL 创建基本的
|
||
UI 元素，通常用于展示 LVGL 的基本功能和使用方法，包括：<ul class="- topic/ul ul" id="lvgl-demo__ul_wr4_cjh_fdc" data-ofbid="lvgl-demo__ul_wr4_cjh_fdc"><li class="- topic/li li" data-ofbid="d308076e33__20250121171814">创建按钮并响应点击事件</li><li class="- topic/li li" data-ofbid="d308076e35__20250121171814">显示文本标签</li><li class="- topic/li li" data-ofbid="d308076e37__20250121171814">使用滑块调整数值</li><li class="- topic/li li" data-ofbid="d308076e39__20250121171814">简单的动画效果</li></ul></li><li class="- topic/li li" data-ofbid="d308076e41__20250121171814"><a class="- topic/xref xref" href="lvgl-demo.html#lvgl-demo__section_xgg_ljh_fdc">Meter Demo</a>：演示如何使用 LVGL 创建仪表盘（meter），
|
||
常用于需要显示数据变化的场景，如速度表、温度计等。功能包括：<ul class="- topic/ul ul" id="lvgl-demo__ul_zsw_2jh_fdc" data-ofbid="lvgl-demo__ul_zsw_2jh_fdc"><li class="- topic/li li" data-ofbid="d308076e47__20250121171814">创建仪表盘并添加指针</li><li class="- topic/li li" data-ofbid="d308076e49__20250121171814">动态更新指针位置</li><li class="- topic/li li" data-ofbid="d308076e51__20250121171814">显示刻度和标签</li><li class="- topic/li li" data-ofbid="d308076e53__20250121171814">支持多种样式和颜色</li></ul></li><li class="- topic/li li" data-ofbid="d308076e55__20250121171814">Widgets demo：展示 LVGL 提供的各种 UI 控件，可以帮助开发者了解如何使用不同的控件来构建复杂的用户界面。UI 控件包括：<ul class="- topic/ul ul" id="lvgl-demo__ul_j23_gjh_fdc" data-ofbid="lvgl-demo__ul_j23_gjh_fdc"><li class="- topic/li li" data-ofbid="d308076e58__20250121171814">列表视图</li><li class="- topic/li li" data-ofbid="d308076e60__20250121171814">下拉菜单</li><li class="- topic/li li" data-ofbid="d308076e62__20250121171814">复选框和单选按钮</li><li class="- topic/li li" data-ofbid="d308076e64__20250121171814">开关按钮</li><li class="- topic/li li" data-ofbid="d308076e66__20250121171814">日期选择器</li></ul></li><li class="- topic/li li" data-ofbid="d308076e68__20250121171814">Benchmark demo：展示 LVGL 在不同硬件平台上的表现，用于测试和评估 LVGL 的性能，包括渲染速度、内存占用指标以及帧率统计。</li></ul></div><p class="- topic/p p" data-ofbid="d308076e70__20250121171814">本节主要介绍 <a class="- topic/xref xref" href="lvgl-demo.html#lvgl-demo__section_fyy_jjh_fdc">Base Demo</a> 和 <a class="- topic/xref xref" href="lvgl-demo.html#lvgl-demo__section_xgg_ljh_fdc">Meter Demo</a>。</p><section class="- topic/section section" id="lvgl-demo__section_fyy_jjh_fdc" data-ofbid="lvgl-demo__section_fyy_jjh_fdc"><h2 class="- topic/title title sectiontitle">Base Demo</h2>
|
||
|
||
<div class="- topic/p p" data-ofbid="d308076e85__20250121171814">Base Demo 演示了如何使用 LVGL 创建基本的 UI 元素，包括 PNG 和 JPG 图片的硬件解码，内置图片的使用方式以及通过滑动操作切换页面。UI
|
||
界面示例如下：<figure class="- topic/fig fig fignone" id="lvgl-demo__id22" data-ofbid="lvgl-demo__id22"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-demo__image_w1h_1zf_fdc" src="../../../images/lvgl/base_demo1.png" alt="base_demo1"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 1</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Base Demo 界面示例</span></figcaption></figure></div>
|
||
<div class="- topic/p p" data-ofbid="d308076e94__20250121171814">Base demo 一共有四个页面， 分别为仪表演示、音乐播放演示、菜单演示以及播放器演示。播放器演示页面需要打开 base_ui.c 中的宏定义
|
||
VIDEO_PLAYER。以下是 base demo 页面的基本布局和特性说明：<ol class="- topic/ol ol arabic simple" id="lvgl-demo__ol_x1h_1zf_fdc" data-ofbid="lvgl-demo__ol_x1h_1zf_fdc"><li class="- topic/li li" data-ofbid="d308076e97__20250121171814">
|
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<div class="- topic/p p" data-ofbid="d308076e99__20250121171814">每个页面都可以通过滑动操作切换。页面滑动使用了 tabview 控件，每个页面都是一个
|
||
tab。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-demo__codeblock_n3b_q1g_fdc" data-ofbid="lvgl-demo__codeblock_n3b_q1g_fdc">lv_obj_set_size(main_tabview, <span class="hl-number">1024</span>, <span class="hl-number">600</span>);
|
||
lv_obj_set_pos(main_tabview, <span class="hl-number">0</span>, <span class="hl-number">0</span>);
|
||
lv_obj_set_style_bg_opa(main_tabview, LV_OPA_<span class="hl-number">0</span>, <span class="hl-number">0</span>);
|
||
|
||
lv_obj_t *main_tab0 = lv_tabview_add_tab(main_tabview, <span class="hl-string">"main page 0"</span>);
|
||
lv_obj_t *main_tab1 = lv_tabview_add_tab(main_tabview, <span class="hl-string">"main page 1"</span>);
|
||
|
||
lv_obj_set_style_bg_opa(main_tab0, LV_OPA_<span class="hl-number">0</span>, <span class="hl-number">0</span>);
|
||
lv_obj_set_style_bg_opa(main_tab1, LV_OPA_<span class="hl-number">0</span>, <span class="hl-number">0</span>);
|
||
lv_obj_set_size(main_tab0, <span class="hl-number">1024</span>, <span class="hl-number">600</span>);
|
||
lv_obj_set_size(main_tab1, <span class="hl-number">1024</span>, <span class="hl-number">600</span>);
|
||
|
||
lv_obj_set_pos(main_tab0, <span class="hl-number">0</span>, <span class="hl-number">0</span>);
|
||
lv_obj_set_pos(main_tab1, <span class="hl-number">0</span>, <span class="hl-number">0</span>);</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e104__20250121171814">
|
||
<div class="- topic/p p" data-ofbid="d308076e106__20250121171814">背景图片通过 image 控件来创建，是一个名字为 <span class="+ topic/ph sw-d/filepath ph filepath">global_bg</span> 的 PNG
|
||
图片。此图片会采用注册的硬件解码器进行解码：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-demo__codeblock_qsp_q1g_fdc" data-ofbid="lvgl-demo__codeblock_qsp_q1g_fdc"><strong class="hl-keyword">static</strong> lv_obj_t *img_bg = NULL;
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img_bg = lv_img_create(lv_scr_act());
|
||
lv_img_set_src(img_bg, LVGL_PATH(global_bg));
|
||
lv_obj_set_pos(img_bg, <span class="hl-number">0</span>, <span class="hl-number">0</span>);</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e114__20250121171814">
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||
<div class="- topic/p p" data-ofbid="d308076e116__20250121171814">菜单图片也通过 image 控件来创建，也是一个 PNG
|
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图片，且此图片也会采用注册的硬件解码器进行解码：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-demo__codeblock_ogc_r1g_fdc" data-ofbid="lvgl-demo__codeblock_ogc_r1g_fdc">lv_obj_t *sub_image00 = lv_img_create(sub_tab0);
|
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lv_img_set_src(sub_image00, LVGL_PATH(cook_<span class="hl-number">0.</span>jpg));
|
||
lv_obj_set_pos(sub_image00, <span class="hl-number">36</span>, <span class="hl-number">100</span>);</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e121__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e123__20250121171814">Fake image</p>
|
||
<div class="- topic/p p" data-ofbid="d308076e126__20250121171814">Fake image 不是一个真实的图片，通过此方式可以方便的对一个矩形区域进行填充，包括
|
||
alpha、red、green、blue：<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-demo__codeblock_knx_r1g_fdc" data-ofbid="lvgl-demo__codeblock_knx_r1g_fdc"><strong class="hl-keyword">static</strong> lv_obj_t *img_bg = NULL;
|
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FAKE_IMAGE_DECLARE(bg_dark) <em class="hl-comment">// 声明（bg_dark 名字可修改）</em>
|
||
|
||
<em class="hl-comment">/* 最后一个参数为要设置的颜色值：bit31:24 为 alpha */</em>
|
||
FAKE_IMAGE_INIT(bg_dark, <span class="hl-number">1024</span>, <span class="hl-number">600</span>, <span class="hl-number">0</span>, <span class="hl-number">0x00000000</span>);
|
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|
||
lv_img_set_src(img_bg, FAKE_IMAGE_NAME(bg_dark)); <em class="hl-comment">// 设置 fake image 数据源</em></pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e131__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e133__20250121171814">Build-in image 是通过数组变量在程序中表示图像。</p>
|
||
<div class="- topic/p p" data-ofbid="d308076e136__20250121171814">图片转换成 <span class="+ topic/ph sw-d/filepath ph filepath">.c</span> 文件的工具，参考官网：<a class="- topic/xref xref reference external" href="http://lvgl.io/tools/imageconverter" target="_blank" rel="external noopener">http://lvgl.io/tools/imageconverter</a><pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-demo__codeblock_hb5_s1g_fdc" data-ofbid="lvgl-demo__codeblock_hb5_s1g_fdc">uint8_t circle_white_map[] = {
|
||
<span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0x00</span>, <span class="hl-number">0xff</span>, <span class="hl-number">0x50</span>, <span class="hl-number">0xff</span>, <span class="hl-number">0x7f</span>, <span class="hl-number">0xff</span>,
|
||
........................................................};
|
||
|
||
<strong class="hl-keyword">const</strong> lv_img_dsc_t circle_white = {
|
||
.header.cf = LV_IMG_CF_TRUE_COLOR_ALPHA,
|
||
.header.always_zero = <span class="hl-number">0</span>,
|
||
.header.reserved = <span class="hl-number">0</span>,
|
||
.header.w = <span class="hl-number">20</span>,
|
||
.header.h = <span class="hl-number">20</span>,
|
||
.data_size = <span class="hl-number">400</span> * LV_IMG_PX_SIZE_ALPHA_BYTE,
|
||
.data = circle_white_map,
|
||
};
|
||
|
||
<strong class="hl-keyword">static</strong> lv_obj_t * circle_<span class="hl-number">0</span> = lv_img_create(img_bg);
|
||
lv_img_set_src(circle_<span class="hl-number">0</span>, &circle_white);
|
||
lv_obj_align(circle_<span class="hl-number">0</span>, LV_ALIGN_BOTTOM_MID, -<span class="hl-number">16</span>, -<span class="hl-number">28</span>);</pre></div>
|
||
</li></ol></div>
|
||
</section><section class="- topic/section section" id="lvgl-demo__section_xgg_ljh_fdc" data-ofbid="lvgl-demo__section_xgg_ljh_fdc"><h2 class="- topic/title title sectiontitle">Meter Demo</h2>
|
||
|
||
<p class="- topic/p p" data-ofbid="d308076e153__20250121171814">Meter demo 演示了硬件旋转，以及仪表盘的设计参考。</p>
|
||
<figure class="- topic/fig fig fignone" id="lvgl-demo__id23" data-ofbid="lvgl-demo__id23"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-demo__image_dbh_1zf_fdc" src="../../../images/lvgl/meter_demo.png" width="384" alt="meter_demo"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 2</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">Meter Demo 界面示例</span></figcaption></figure>
|
||
<p class="- topic/p p" data-ofbid="d308076e163__20250121171814">Meter demo 的详细说明及特点如下：</p>
|
||
<ol class="- topic/ol ol arabic simple" id="lvgl-demo__ol_ebh_1zf_fdc" data-ofbid="lvgl-demo__ol_ebh_1zf_fdc"><li class="- topic/li li" data-ofbid="d308076e167__20250121171814">
|
||
<div class="- topic/p p" data-ofbid="d308076e169__20250121171814">各种控件的动作通过 timer
|
||
来实现，每间隔一定的时间执行相应的回调函数。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-demo__codeblock_a4b_51g_fdc" data-ofbid="lvgl-demo__codeblock_a4b_51g_fdc">lv_timer_create(point_callback, <span class="hl-number">10</span>, <span class="hl-number">0</span>);
|
||
lv_timer_create(fps_callback, <span class="hl-number">1000</span>, <span class="hl-number">0</span>);
|
||
lv_timer_create(speed_callback, <span class="hl-number">100</span>, <span class="hl-number">0</span>);
|
||
lv_timer_create(time_callback, <span class="hl-number">1000</span> * <span class="hl-number">60</span>, <span class="hl-number">0</span>);</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e174__20250121171814">
|
||
<div class="- topic/p p" data-ofbid="d308076e176__20250121171814">指针和光影通过贴图和硬件任意角度旋转来实现。其中，前 74 张指针通过切换 74 张图片来实现， 从第 75
|
||
张开始的红色指针，采用硬件任意角度旋转来实现。<pre class="+ topic/pre pr-d/codeblock pre codeblock language-c" id="lvgl-demo__codeblock_fck_51g_fdc" data-ofbid="lvgl-demo__codeblock_fck_51g_fdc"><strong class="hl-keyword">static</strong> <strong class="hl-keyword">void</strong> point_callback(lv_timer_t *tmr)
|
||
{
|
||
<strong class="hl-keyword">char</strong> data_str[<span class="hl-number">64</span>];
|
||
(<strong class="hl-keyword">void</strong>)tmr;
|
||
|
||
<strong class="hl-keyword">static</strong> bool first = true;
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> id = <span class="hl-number">1</span>;
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> direct = <span class="hl-number">0</span>;
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> mode_id = <span class="hl-number">0</span>;
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> mode_num = <strong class="hl-keyword">sizeof</strong>(rot_mode_list) / <strong class="hl-keyword">sizeof</strong>(rot_mode_list[<span class="hl-number">0</span>]);
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> start_id = <span class="hl-number">0</span>;
|
||
<strong class="hl-keyword">static</strong> <strong class="hl-keyword">int</strong> end_id = <span class="hl-number">0</span>;
|
||
|
||
<strong class="hl-keyword">if</strong> (first) {
|
||
first = false;
|
||
start_id = rot_mode_list[mode_id].start_id;
|
||
end_id = rot_mode_list[mode_id].end_id;
|
||
}
|
||
|
||
direct = start_id < end_id ? <span class="hl-number">0</span>: <span class="hl-number">1</span>;
|
||
|
||
<strong class="hl-keyword">if</strong> (id < <span class="hl-number">75</span>) {
|
||
lv_img_set_src(img_circle, LVGL_PATH(bg/small_blue));
|
||
lv_obj_clear_flag(img_circle, LV_OBJ_FLAG_HIDDEN);
|
||
} <strong class="hl-keyword">else</strong> {
|
||
lv_obj_add_flag(img_circle, LV_OBJ_FLAG_HIDDEN);
|
||
}
|
||
|
||
<strong class="hl-keyword">if</strong> (id < <span class="hl-number">75</span>) {
|
||
sprintf(data_str, <span class="hl-string">"%spoint/point_%05d"</span>, LVGL_DIR, id);
|
||
lv_img_set_src(img_point, data_str);
|
||
lv_img_set_angle(img_point, <span class="hl-number">0</span>);
|
||
|
||
} <strong class="hl-keyword">else</strong> {
|
||
<em class="hl-comment">// id to angle</em>
|
||
<strong class="hl-keyword">float</strong> rot_angle = ((<strong class="hl-keyword">float</strong>)(id - <span class="hl-number">75</span>) * <span class="hl-number">2</span> * <span class="hl-number">10</span>) * <span class="hl-number">0.84</span>;
|
||
sprintf(data_str, <span class="hl-string">"%spoint/point_%05d"</span>, LVGL_DIR, <span class="hl-number">75</span>);
|
||
lv_img_set_src(img_point, data_str);
|
||
lv_img_set_pivot(img_point, <span class="hl-number">210</span>, <span class="hl-number">210</span>);
|
||
lv_img_set_angle(img_point, (int16_t)rot_angle);
|
||
}
|
||
|
||
<strong class="hl-keyword">if</strong> (direct == <span class="hl-number">0</span>) {
|
||
id++;
|
||
} <strong class="hl-keyword">else</strong> {
|
||
id--;
|
||
}
|
||
|
||
<strong class="hl-keyword">if</strong> ((!direct && (id > end_id) ) ||
|
||
(direct && (id < end_id))) {
|
||
id = end_id;
|
||
mode_id++;
|
||
mode_id %= mode_num;
|
||
start_id = rot_mode_list[mode_id].start_id;
|
||
end_id = rot_mode_list[mode_id].end_id;
|
||
}
|
||
|
||
<strong class="hl-keyword">return</strong>;
|
||
}</pre></div>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e181__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e183__20250121171814">UI 设计方案比较。</p>
|
||
<p class="- topic/p p" data-ofbid="d308076e186__20250121171814">针对本 demo 场景，有以下 UI 设计方案可供选择。其中 UI 设计方案 2 更高效，实现同样的界面效果，简化流程速度可以提升一倍以上：</p>
|
||
<ol class="- topic/ol ol arabic" type="a" id="lvgl-demo__ol_gbh_1zf_fdc" data-ofbid="lvgl-demo__ol_gbh_1zf_fdc"><li class="- topic/li li" data-ofbid="d308076e190__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e192__20250121171814">UI 设计方案 1</p>
|
||
<figure class="- topic/fig fig fignone" id="lvgl-demo__id24" data-ofbid="lvgl-demo__id24"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-demo__image_hbh_1zf_fdc" src="../../../images/lvgl/meter_draw_1.png" width="480" alt="meter_draw_1"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 3</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title">UI 设计方案 1 示例</span></figcaption></figure>
|
||
<ul class="- topic/ul ul simple" id="lvgl-demo__ul_ibh_1zf_fdc" data-ofbid="lvgl-demo__ul_ibh_1zf_fdc"><li class="- topic/li li" data-ofbid="d308076e203__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e205__20250121171814">准备光条、指针、光圈、底图四张图片。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e208__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e210__20250121171814">按照先后顺序，依次对光圈和背景、光条和背景以及指针和背景进行 alpha blending。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e213__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e215__20250121171814">每一个角度的旋转都需要进行三次 alpha blending。</p>
|
||
</li></ul>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e219__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e221__20250121171814">UI 设计方案 2</p>
|
||
<figure class="- topic/fig fig fignone" id="lvgl-demo__id25" data-ofbid="lvgl-demo__id25"><br/><div class="imagecenter"><img class="- topic/image image imagecenter" id="lvgl-demo__image_jbh_1zf_fdc" src="../../../images/lvgl/meter_draw_2.png" width="480" alt="meter_draw_2"/></div><br/><figcaption data-caption-side="bottom" class="- topic/title title figcapcenter"><span class="figtitleprefix fig--title-label">图<span class="fig--title-label-number"> 4</span><span class="fig--title-label-punctuation">. </span></span><span class="fig--title"> UI 设计方案 2 示例</span></figcaption></figure>
|
||
<ul class="- topic/ul ul simple" id="lvgl-demo__ul_kbh_1zf_fdc" data-ofbid="lvgl-demo__ul_kbh_1zf_fdc"><li class="- topic/li li" data-ofbid="d308076e232__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e234__20250121171814">光条和指针合并为一张图片。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e237__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e239__20250121171814">光圈合并到背景图中。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e242__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e244__20250121171814">准备光条和指针图片和底图。</p>
|
||
</li><li class="- topic/li li" data-ofbid="d308076e247__20250121171814">
|
||
<p class="- topic/p p" data-ofbid="d308076e249__20250121171814">每一个角度的旋转都只需要对光条和指针图片与背景图进行一次 alpha blending。</p>
|
||
</li></ul>
|
||
</li></ol>
|
||
</li></ol>
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</section></div></article></main></div>
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<div class=" wh_topic_toc "><div class="wh_topic_label">在本页上</div><ul><li class="section-item"><div class="section-title"><a href="#lvgl-demo__section_fyy_jjh_fdc" data-tocid="lvgl-demo__section_fyy_jjh_fdc">Base Demo</a></div></li><li class="section-item"><div class="section-title"><a href="#lvgl-demo__section_xgg_ljh_fdc" data-tocid="lvgl-demo__section_xgg_ljh_fdc">Meter Demo</a></div></li></ul></div>
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