Implement sound_changevolumeby

Author: adazem009

src/blocks/soundblocks.cpp

@@ -37,6 +37,7 @@ void SoundBlocks::registerBlocks(IEngine *engine)
     engine->addCompileFunction(this, "sound_seteffectto", &compileSetEffectTo);
     engine->addCompileFunction(this, "sound_changeeffectby", &compileChangeEffectBy);
     engine->addCompileFunction(this, "sound_cleareffects", &compileClearEffects);
+    engine->addCompileFunction(this, "sound_changevolumeby", &compileChangeVolumeBy);
 }
 
 void SoundBlocks::onInit(IEngine *engine)
@@ -128,6 +129,13 @@ CompilerValue *SoundBlocks::compileClearEffects(Compiler *compiler)
     return nullptr;
 }
 
+CompilerValue *SoundBlocks::compileChangeVolumeBy(Compiler *compiler)
+{
+    auto volume = compiler->addInput("VOLUME");
+    compiler->addTargetFunctionCall("sound_changevolumeby", Compiler::StaticType::Void, { Compiler::StaticType::Number }, { volume });
+    return nullptr;
+}
+
 int sound_wrap_clamp_index(Target *target, int index)
 {
     const long soundCount = target->sounds().size();
@@ -222,3 +230,8 @@ extern "C" void sound_cleareffects(Target *target)
 {
     target->clearSoundEffects();
 }
+
+extern "C" void sound_changevolumeby(Target *target, double volume)
+{
+    target->setVolume(target->volume() + volume);
+}

src/blocks/soundblocks.h

@@ -26,6 +26,7 @@ class SoundBlocks : public IExtension
         static CompilerValue *compileSetEffectTo(Compiler *compiler);
         static CompilerValue *compileChangeEffectBy(Compiler *compiler);
         static CompilerValue *compileClearEffects(Compiler *compiler);
+        static CompilerValue *compileChangeVolumeBy(Compiler *compiler);
 };
 
 } // namespace libscratchcpp

test/blocks/sound_blocks_test.cpp

@@ -1028,3 +1028,33 @@ TEST_F(SoundBlocksTest, ClearEffects)
     EXPECT_CALL(*target, setSoundEffectValue).Times(0);
     thread.run();
 }
+
+TEST_F(SoundBlocksTest, ChangeVolumeBy_Sprite)
+{
+    auto sprite = std::make_shared<Sprite>();
+    sprite->setVolume(42);
+
+    ScriptBuilder builder(m_extension.get(), m_engine, sprite);
+    builder.addBlock("sound_changevolumeby");
+    builder.addValueInput("VOLUME", 65.2);
+    builder.build();
+
+    sprite->setVolume(1.9);
+    builder.run();
+    ASSERT_EQ(std::round(sprite->volume() * 100) / 100, 67.1);
+}
+
+TEST_F(SoundBlocksTest, ChangeVolumeBy_Stage)
+{
+    auto stage = std::make_shared<Stage>();
+    stage->setVolume(18);
+
+    ScriptBuilder builder(m_extension.get(), m_engine, stage);
+    builder.addBlock("sound_changevolumeby");
+    builder.addValueInput("VOLUME", -38.4);
+    builder.build();
+
+    stage->setVolume(78.5);
+    builder.run();
+    ASSERT_EQ(stage->volume(), 40.1);
+}