Add clamp() method to IGraphicsEffect

Author: adazem009

include/scratchcpp/igraphicseffect.h

@@ -17,6 +17,9 @@ class LIBSCRATCHCPP_EXPORT IGraphicsEffect
 
         /*! Returns the name of the graphics effect. */
         virtual std::string name() const = 0;
+
+        /*! Returns the clamped value of the graphic effect. */
+        virtual double clamp(double value) const = 0;
 };
 
 } // namespace libscratchcpp

test/mocks/graphicseffectmock.h

@@ -9,4 +9,6 @@ class GraphicsEffectMock : public IGraphicsEffect
 {
     public:
         MOCK_METHOD(std::string, name, (), (const, override));
+
+        MOCK_METHOD(double, clamp, (double), (const, override));
 };