Add Rectangle::draw() function, use it in colors example

dgl/Geometry.hpp

@@ -128,6 +128,8 @@ public:
     void setSize(const T& width, const T& height) noexcept;
     void setSize(const Size<T>& size) noexcept;
 
+    void draw();
+
     Rectangle<T>& operator=(const Rectangle<T>& rect) noexcept;
 
 private:

dgl/src/Geometry.cpp

@@ -412,6 +412,30 @@ void Rectangle<T>::setSize(const Size<T>& size) noexcept
     fSize = size;
 }
 
+template<typename T>
+void Rectangle<T>::draw()
+{
+    // TODO - use glVexter2 d/f/i/s according to T type
+
+    glBegin(GL_QUADS);
+
+    {
+        glTexCoord2f(0.0f, 0.0f);
+        glVertex2i(fPos.fX, fPos.fY);
+
+        glTexCoord2f(1.0f, 0.0f);
+        glVertex2i(fPos.fX+fSize.fWidth, fPos.fY);
+
+        glTexCoord2f(1.0f, 1.0f);
+        glVertex2i(fPos.fX+fSize.fWidth, fPos.fY+fSize.fHeight);
+
+        glTexCoord2f(0.0f, 1.0f);
+        glVertex2i(fPos.fX, fPos.fY+fSize.fHeight);
+    }
+
+    glEnd();
+}
+
 template<typename T>
 Rectangle<T>& Rectangle<T>::operator=(const Rectangle<T>& rect) noexcept
 {
@@ -423,16 +447,19 @@ Rectangle<T>& Rectangle<T>::operator=(const Rectangle<T>& rect) noexcept
 // -----------------------------------------------------------------------
 // Possible template data types
 
+template class Point<short>;
 template class Point<int>;
 template class Point<long>;
 template class Point<float>;
 template class Point<double>;
 
+template class Size<short>;
 template class Size<int>;
 template class Size<long>;
 template class Size<float>;
 template class Size<double>;
 
+template class Rectangle<short>;
 template class Rectangle<int>;
 template class Rectangle<long>;
 template class Rectangle<float>;

examples/color.cpp

@@ -99,50 +99,13 @@ private:
 
     void onDisplay() override
     {
-        int x = 0;
-        int y = 0;
-        int width  = getWidth();
-        int height = getHeight();
-
         // paint bg color (in full size)
         glColor3b(r, g, b);
-
-        glBegin(GL_QUADS);
-          glTexCoord2f(0.0f, 0.0f);
-          glVertex2i(x, y);
-
-          glTexCoord2f(1.0f, 0.0f);
-          glVertex2i(x+width, y);
-
-          glTexCoord2f(1.0f, 1.0f);
-          glVertex2i(x+width, y+height);
-
-          glTexCoord2f(0.0f, 1.0f);
-          glVertex2i(x, y+height);
-        glEnd();
-
-        // centered 2/3 size
-        x = width/6;
-        y = height/6;
-        width  = width*2/3;
-        height = height*2/3;
+        bgFull.draw();
 
         // paint inverted color (in 2/3 size)
         glColor3b(100-r, 100-g, 100-b);
-
-        glBegin(GL_QUADS);
-          glTexCoord2f(0.0f, 0.0f);
-          glVertex2i(x, y);
-
-          glTexCoord2f(1.0f, 0.0f);
-          glVertex2i(x+width, y);
-
-          glTexCoord2f(1.0f, 1.0f);
-          glVertex2i(x+width, y+height);
-
-          glTexCoord2f(0.0f, 1.0f);
-          glVertex2i(x, y+height);
-        glEnd();
+        bgSmall.draw();
     }
 
     void onReshape(int width, int height) override
@@ -150,11 +113,19 @@ private:
         // make widget same size as window
         setSize(width, height);
         Widget::onReshape(width, height);
+
+        // full bg
+        bgFull = Rectangle<int>(0, 0, width, height);
+
+        // small bg, centered 2/3 size
+        bgSmall = Rectangle<int>(width/6, height/6, width*2/3, height*2/3);
     }
 
     char cur;
     bool reverse;
     int r, g, b;
+
+    Rectangle<int> bgFull, bgSmall;
 };
 
 // ------------------------------------------------------