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using a line for a slider

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           i am basically using the  ID3DXLine object to represent a slider to set the view fov,i cant understand        why after i set the position with the mouse it starts to decrease by its self..

 

           in my render scene code i have

            if(LMBDown)
            {
                if((float)mouseX > 550.0f)
                {
                    vLine[0].x = 550.0f;
                    vLine[0].y = 160.0f;
                    vLine[1].x =  (float)mouseX;
                    vLine[1].y =  160.0f;  
                   
                }
            }
             pLine->Begin( );
             pLine->Draw( vLine, 2,D3DCOLOR_XRGB( 0, 100, 0 ));
             pLine->End( );
 

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