Box rotation works correctly now. Code still pretty messy.

docs/core.todo

@@ -18,6 +18,8 @@ Core:
         ✔ Implement Render to Texture @done (9/15/2021, 7:00:33 PM)
         ✔ Adjust the font loading code to use the binary file buffer instead of ifstream @done (9/17/2021, 6:11:06 PM)
         ☐ Find a way to add rotation to shapes and images
+        ✔ Add a DrawPolygon method that takes vertices and draws arbirary shapes @done (10/29/2021, 6:24:14 PM)
+        ☐ Allow DrawPolygon to add a texture to the polygon
 
         
         GUI:

src/graphics/igraphics.h

@@ -48,13 +48,14 @@ namespace lunarium
         virtual Color GetClearColor() const = 0;
 
 		// Draw Methods
+		virtual void DrawFilledPolygon(float* pVerts, int numVerts, Color color) = 0;
 		virtual void DrawLine(glm::vec2 point1, glm::vec2 point2, Color color, float lineWidth) = 0;
 		virtual void DrawEllipse(glm::vec2 center, glm::vec2 radii, Color color, float thickness, int resolution) = 0;
 		virtual void DrawFilledEllipse(glm::vec2 center, glm::vec2 radii, Color color, int resolution) = 0;
-		virtual void DrawBox(Rectangle dimensions, Color color, float thickness) = 0;
-		virtual void DrawFilledBox(glm::vec2 topLeft, glm::vec2 botRight, Color color) = 0;
-		virtual void DrawImage(Image& image, glm::vec2 topLeft, Color color) = 0;
-		virtual void DrawImage(Image& image, Rectangle source, Rectangle destination, Color color) = 0;
+		virtual void DrawBox(Rectangle dimensions, Color color, float thickness, float angle = 0.0f) = 0;
+		virtual void DrawFilledBox(glm::vec2 topLeft, glm::vec2 botRight, Color color, float angle = 0.0f) = 0;
+		virtual void DrawImage(Image& image, glm::vec2 topLeft, Color color, float angle = 0.0f) = 0;
+		virtual void DrawImage(Image& image, Rectangle source, Rectangle destination, Color color, float angle = 0.0f) = 0;
 		virtual void DrawString(const char* string, Rectangle boundingArea, Color color, float scale = 1.0f, int font = 0) = 0;
 
 		virtual void RegisterImage(Image& image) = 0;

src/graphics/opengl/glGraphics.cpp

@@ -273,7 +273,7 @@ namespace lunarium
 		glBindVertexArray(0);
     }
 
-    void OglGraphics::DrawFilledBox(glm::vec2 topLeft, glm::vec2 botRight, Color color)
+	void OglGraphics::DrawFilledPolygon(float* pVerts, int numVerts, Color color)
 	{
 		mShapeShader.MakeActive();
 		mShapeShader.SetUniformMatrix("projection", 1, glm::value_ptr(mProjection));
@@ -282,14 +282,55 @@ namespace lunarium
 		mShapeShader.SetUniformf("shapeColor", { color.Red, color.Green, color.Blue, color.Alpha });
 		glBindVertexArray(mRectVAO);
 
+		glBindBuffer(GL_ARRAY_BUFFER, mRectVBO);
+		glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(pVerts), pVerts);
+		glBindBuffer(GL_ARRAY_BUFFER, 0);
+		
+		glDrawArrays(GL_TRIANGLES, 0, numVerts);
+		glBindVertexArray(0);
+	}
+
+    void OglGraphics::DrawFilledBox(glm::vec2 topLeft, glm::vec2 botRight, Color color, float angle)
+    {
+        mShapeShader.MakeActive();
+		mShapeShader.SetUniformMatrix("projection", 1, glm::value_ptr(mProjection));
+		glm::mat4 model = glm::mat4(1.0f);
+		float width = botRight.x - topLeft.x;
+		float height = botRight.y - topLeft.y;
+		model = glm::translate(model, glm::vec3(topLeft.x + width / 2, topLeft.y + height / 2 , 0.0f));
+		model = glm::rotate(model, angle, glm::vec3(0.0f, 0.0f, 1.0f));
+		model = glm::scale(model, glm::vec3(width, height, 1.0f));
+		mShapeShader.SetUniformMatrix("model", 1, glm::value_ptr(model));
+		mShapeShader.SetUniformf("shapeColor", { color.Red, color.Green, color.Blue, color.Alpha });
+		glBindVertexArray(mRectVAO);
+
+		// GLfloat vertices[6][4] = {
+		// 			{ topLeft.x,  botRight.y, },
+		// 			{ botRight.x, topLeft.y,     },
+		// 			{ topLeft.x,  topLeft.y,     },
+
+		// 			{ topLeft.x,  botRight.y, },
+		// 			{ botRight.x, botRight.y, },
+		// 			{ botRight.x, topLeft.y,     }
+		// 		};
+
+		// Pos     
+		// 0.0f, 1.0f,
+		// 1.0f, 0.0f,
+		// 0.0f, 0.0f,
+
+		// 0.0f, 1.0f,
+		// 1.0f, 1.0f,
+		// 1.0f, 0.0f,
+
 		GLfloat vertices[6][4] = {
-					{ topLeft.x,  botRight.y, },
-					{ botRight.x, topLeft.y,     },
-					{ topLeft.x,  topLeft.y,     },
+					{ -0.5f,  0.5f, },
+					{ 0.5f, -0.5f,  },
+					{ -0.5f,  -0.5f, },
 
-					{ topLeft.x,  botRight.y, },
-					{ botRight.x, botRight.y, },
-					{ botRight.x, topLeft.y,     }
+					{ -0.5f, 0.5f, },
+					{  0.5f, 0.5f, },
+					{ 0.5f, -0.5f,  }
 				};
 		glBindBuffer(GL_ARRAY_BUFFER, mRectVBO);
 		glBufferSubData(GL_ARRAY_BUFFER, 0, sizeof(vertices), vertices);
@@ -299,7 +340,7 @@ namespace lunarium
 		glBindVertexArray(0);
     }
 
-    void OglGraphics::DrawBox(Rectangle dimensions, Color color, float thickness)
+    void OglGraphics::DrawBox(Rectangle dimensions, Color color, float thickness, float angle)
     {
         glm::vec2 topLeft(dimensions.Left, dimensions.Top);
         glm::vec2 botRight(dimensions.right(), dimensions.bottom());
@@ -317,13 +358,13 @@ namespace lunarium
 		DrawLine(glm::vec2(botRight.x, topLeft.y), glm::vec2(topLeft.x, topLeft.y), color, thickness);
     }
 
-    void OglGraphics::DrawImage(Image& image, glm::vec2 topLeft, Color color)
+    void OglGraphics::DrawImage(Image& image, glm::vec2 topLeft, Color color, float angle)
     {
         DrawImage(image, Rectangle(0.0f, 0.0f, (float)image.GetWidth(), (float)image.GetHeight()),
-		 	Rectangle(topLeft.x, topLeft.y, (float)image.GetWidth(), (float)image.GetHeight()), color);
+		 	Rectangle(topLeft.x, topLeft.y, (float)image.GetWidth(), (float)image.GetHeight()), color, angle);
     }
 
-    void OglGraphics::DrawImage(Image& image, Rectangle source, Rectangle destination, Color color)
+    void OglGraphics::DrawImage(Image& image, Rectangle source, Rectangle destination, Color color, float angle)
     {
         glm::mat4 id = glm::mat4(1.0f);
 		glm::vec3 pos = glm::vec3(destination.Left, destination.Top, 0.0f);

src/graphics/opengl/glGraphics.h

@@ -43,13 +43,14 @@ namespace lunarium
         virtual Color GetClearColor() const;
 
 		// Draw Methods
+		virtual void DrawFilledPolygon(float* pVerts, int numVerts, Color color);
 		virtual void DrawLine(glm::vec2 point1, glm::vec2 point2, Color color, float lineWidth);
 		virtual void DrawEllipse(glm::vec2 center, glm::vec2 radii, Color color, float thickness, int resolution);
 		virtual void DrawFilledEllipse(glm::vec2 center, glm::vec2 radii, Color color, int resolution);
-		virtual void DrawBox(Rectangle dimensions, Color color, float thickness);
-		virtual void DrawFilledBox(glm::vec2 topLeft, glm::vec2 botRight, Color color);
-		virtual void DrawImage(Image& image, glm::vec2 topLeft, Color color);
-		virtual void DrawImage(Image& image, Rectangle source, Rectangle destination, Color color);
+		virtual void DrawBox(Rectangle dimensions, Color color, float thickness, float angle = 0.0f);
+		virtual void DrawFilledBox(glm::vec2 topLeft, glm::vec2 botRight, Color color, float angle = 0.0f);
+		virtual void DrawImage(Image& image, glm::vec2 topLeft, Color color, float angle = 0.0f);
+		virtual void DrawImage(Image& image, Rectangle source, Rectangle destination, Color color, float angle = 0.0f);
 		virtual void DrawString(const char* string, Rectangle boundingArea, Color color, float scale = 1.0f, int font = 0);
 
 		virtual void RegisterImage(Image& image);

src/run_modes/tester/scenes/physicsScene.cpp

@@ -51,7 +51,7 @@ namespace lunarium
        // For step 1 we create the ground body. For this we need a body definition. 
        // With the body definition we specify the initial position of the ground body.
         b2BodyDef groundBodyDef;
-        groundBodyDef.position.Set(30.0f, 50.0f);
+        groundBodyDef.position.Set(60.0f, 50.0f);
 
         // For step 2 the body definition is passed to the world object to create the ground body. 
         // The world object does not keep a reference to the body definition. Bodies are static by default. 
@@ -69,6 +69,13 @@ namespace lunarium
         // to the body without creating a fixture definition.
         mpGroundBody->CreateFixture(mpGroundBox, 0.0f);
 
+        // Create a second ground body
+        groundBodyDef.position.Set(20.0f, 70.0f);
+        mpGroundBody2 = mb2World->CreateBody(&groundBodyDef);
+        mpGroundBox2 = new b2PolygonShape;
+        mpGroundBox2->SetAsBox(30.0f, 5.0f);
+        mpGroundBody2->CreateFixture(mpGroundBox2, 0.0f);
+
         /////////////////////////////////////////////////////////////////////////////
         // So now we have a ground body. We can use the same technique to create a dynamic body. 
         // The main difference, besides dimensions, is that we must establish the dynamic body's mass properties.
@@ -77,7 +84,7 @@ namespace lunarium
         // at construction time to make the body dynamic.
         b2BodyDef bodyDef;
         bodyDef.type = b2_dynamicBody; // Caution: You must set the body type to b2_dynamicBody if you want the body to move in response to forces.
-        bodyDef.position.Set(9.0f, 4.0f);
+        bodyDef.position.Set(39.0f, 4.0f);
         mpDynamicBody = mb2World->CreateBody(&bodyDef);
 
          
@@ -118,39 +125,45 @@ namespace lunarium
 
         b2AABB groundbox;
         mpGroundBox->ComputeAABB(&groundbox, mpGroundBody->GetTransform(), 0);
-        // float hwidth = groundbox.GetExtents().x;
-        // float hheight = groundbox.GetExtents().y;
-        // float left = (groundbox.GetCenter().x - hwidth);
-        // float top = (groundbox.GetCenter().y - hheight);
-        // float right = left + hwidth * 2;
-        // float bot = top + hheight * 2;
     
         Rectangle groundRect(groundbox);
         g->DrawFilledBox(groundRect.LeftTop() * scaleFactor, 
                         groundRect.RightBottom() * scaleFactor, 
                         Color(0.0f, 1.0f, 0.0f, 1.0f));
 
+        b2AABB groundbox2;
+        mpGroundBox2->ComputeAABB(&groundbox2, mpGroundBody2->GetTransform(), 0);
+    
+        Rectangle groundRect2(groundbox2);
+        g->DrawFilledBox(groundRect2.LeftTop() * scaleFactor, 
+                        groundRect2.RightBottom() * scaleFactor, 
+                        Color(0.0f, 1.0f, 0.0f, 1.0f));
+
         b2AABB dynbox;
-        mpDynamicBox->ComputeAABB(&dynbox, mpDynamicBody->GetTransform(), 0);
+        b2Transform transform;
+        transform.p = mpDynamicBody->GetTransform().p;
+        transform.q = b2Rot(0.0f);
+        mpDynamicBox->ComputeAABB(&dynbox, transform, 0);
         Rectangle dynRect(dynbox);
+        float angle = mpDynamicBody->GetAngle();
         g->DrawFilledBox(dynRect.LeftTop() * scaleFactor, 
                         dynRect.RightBottom() * scaleFactor, 
-                        Color(0.0f, 0.0f, 1.0f, 1.0f));
+                        Color(0.0f, 0.0f, 1.0f, 1.0f), angle);
 
         // Debug info
         char str[256] = { 0 };
         sprintf(str, "GroundBox: (%f, %f) (%f, %f)",
         groundRect.LeftTop().x * scaleFactor, groundRect.LeftTop().y * scaleFactor,  
         groundRect.RightBottom().x * scaleFactor, groundRect.RightBottom().y * scaleFactor);
-        g->DrawString(str, Rectangle(10.0f, 10.0f, 800.0f, 30.0f), Color(0.75f, 0.85f, 0.5f, 1.0f), 0.5f);
+        g->DrawString(str, Rectangle(10.0f, 10.0f, 800.0f, 30.0f), Color(0.75f, 0.85f, 0.5f, 1.0f), 0.4f);
 
         sprintf(str, "GroundBox Half Size: (%f, %f)", groundRect.Width, groundRect.Height);
-        g->DrawString(str, Rectangle(10.0f, 35.0f, 800.0f, 30.0f), Color(0.75f, 0.85f, 0.5f, 1.0f), 0.5f);
+        g->DrawString(str, Rectangle(10.0f, 35.0f, 800.0f, 30.0f), Color(0.75f, 0.85f, 0.5f, 1.0f), 0.4f);
         
-        sprintf(str, "DynBox: (%f, %f) (%f, %f)",
+        sprintf(str, "DynBox: (%f, %f) (%f, %f), Angle: %f",
         dynRect.LeftTop().x * scaleFactor, dynRect.LeftTop().y * scaleFactor,  
-        dynRect.RightBottom().x * scaleFactor, dynRect.RightBottom().y * scaleFactor);
-        g->DrawString(str, Rectangle(10.0f, 60.0f, 800.0f, 100.0f), Color(0.75f, 0.85f, 0.5f, 1.0f), 0.5f);
+        dynRect.RightBottom().x * scaleFactor, dynRect.RightBottom().y * scaleFactor, angle);
+        g->DrawString(str, Rectangle(10.0f, 60.0f, 1000.0f, 100.0f), Color(0.75f, 0.85f, 0.5f, 1.0f), 0.4);
 
         int ww, wh;
         Core::MainWindow().GetFramebufferSize(&ww, &wh);

src/run_modes/tester/scenes/physicsScene.h

@@ -14,6 +14,7 @@
 class b2World;
 class b2Body;
 class b2PolygonShape;
+class b2AABB;
 
 namespace lunarium
 {
@@ -29,9 +30,12 @@ namespace lunarium
     private:
         b2World* mb2World;
         b2Body* mpGroundBody;
+        b2Body* mpGroundBody2;
         b2PolygonShape* mpGroundBox;
+        b2PolygonShape* mpGroundBox2;
         b2Body* mpDynamicBody;
         b2PolygonShape* mpDynamicBox;
+        b2AABB*         mpDynAABB;
     };
 }