Radial fix, PDF gradinet implementation

Fixed radial shading cone display
Started working on coons shading, it can convert pdfreader colors to graphics colors(rgb only) and drow similar (in math sense) shape, however size is still wrong, figuring out how to diplay shape with corect size and offset.
Todo:
 Other gradients
 Size and offset
 Alpha Channel

Test/Applications/gradient/Gradient/mainwindow.h

@@ -124,6 +124,10 @@ private slots:
 
     void on_TrianglePoint3Y_sliderMoved(int position);
 
+    void on_LeftButton_clicked();
+
+    void on_RightButton_clicked();
+
 private:
     Ui::MainWindow *ui;
 };