firemonkey canvas paint repeatedly circles onmousemove

  

I am using Delphi 10.4 and Delphi XE8 for educational purposes.
I made a canvas painting app for free hand drawing. In the OnMouseDown() event I draw an ellipse at mouse position and I want to draw more ellipses in the OnMouseMove() event. But, on drawing to the canvas, there are blank parts between ellipses. I want to draw repeatedly without blank parts. How can I do that?

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