88 lines
1.8 KiB
C++
88 lines
1.8 KiB
C++
// Copyright (C) 2019 Nomango
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#pragma once
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#include "common.h"
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class Demo3
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: public Scene
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{
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MusicPtr music; // 音乐对象
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TextPtr volume_text; // 音量文字
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TextPtr state_text; // 播放状态文字
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public:
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static ScenePtr Create()
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{
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return new Demo3;
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}
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Demo3()
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{
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// 加载音乐
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music = E_NEW Music;
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if (!music->Load(L"res/music.wav"))
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{
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music = nullptr;
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auto err = E_NEW Text(L"音频文件加载失败");
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this->AddChild(err);
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}
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// 播放音乐（参数用来设置播放循环次数，-1 表示循环播放）
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music->Play(-1);
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// 创建说明文字
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auto intro_text = E_NEW Text(L"按上下键调整音量\n按空格键暂停或继续");
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intro_text->SetAnchor(0.5f, 0.5f);
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intro_text->SetPosition(WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2 - 50);
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// 创建音量文字
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volume_text = E_NEW Text(L"当前音量：");
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volume_text->SetAnchor(0.5f, 0.5f);
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volume_text->SetPosition(WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2 + 30);
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// 创建状态文字
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state_text = E_NEW Text(L"当前状态：");
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state_text->SetAnchor(0.5f, 0.5f);
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state_text->SetPosition(WINDOW_WIDTH / 2, WINDOW_HEIGHT / 2 + 60);
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// 添加到场景
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this->AddChild(intro_text);
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this->AddChild(volume_text);
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this->AddChild(state_text);
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}
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void OnUpdate(Duration dt) override
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{
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if (music == nullptr)
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return;
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// 获取音量和播放状态
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float volume = music->GetVolume();
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bool playing = music->IsPlaying();
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// 修改文本
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volume_text->SetText(L"当前音量：" + std::to_wstring(volume));
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state_text->SetText(playing ? L"当前状态：正在播放" : L"当前状态：停止播放");
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// 获取输入设备
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auto input = Input::Instance();
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// 按空格键暂停或继续
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if (input->WasPressed(KeyCode::Space))
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{
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music->IsPlaying() ? music->Pause() : music->Resume();
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}
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// 按上下键调整音量
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if (input->WasPressed(KeyCode::Up))
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{
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music->SetVolume(volume + 0.1f);
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}
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else if (input->WasPressed(KeyCode::Down))
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{
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music->SetVolume(volume - 0.1f);
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}
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}
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};
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