hello me again, to solve my problem, i don't install a trackball. i am just changing the values of the map_set_function. i have worked with widgets. so i reached to rotate the map projection by clicking a button, but it only works for one time, because the map projection always starting at the values, which was define by me...so i can't rotate in x-axis and after that in y-axis...hope you understand what i mean and want nad can help me... That is my code: PRO experiment2_event, ev WIDGET_CONTROL, ev.id, GET_UVALUE = eventval CASE eventval OF 'DRAW_WIN_EVENT': BEGIN IF ev.press EQ 1 THEN BEGIN CURSOR, LON, LAT & PRINT, 'X = ', LON, ' Y = ', LAT ENDIF END 'Rotate1' : BEGIN a=-90 REPEAT BEGIN A=A+1 MAP_SET, (A),-0,10,/ORTHOGRAPHIC,/ISOTROPIC,/GRID,/CONTINENTS,/LABEL,/HORIZON ENDREP UNTIL A EQ -45 A=A END 'Rotate2' : BEGIN b=-0 REPEAT BEGIN B=B+1 MAP_SET, -90,(B),10,/ORTHOGRAPHIC,/ISOTROPIC,/GRID,/CONTINENTS,/LABEL,/HORIZON ENDREP UNTIL B EQ 45 END 'exit' : BEGIN WIDGET_CONTROL, ev.TOP, /DESTROY END ENDCASE END PRO experiment2 main = widget_base (title='Globus', /column) btn1 = widget_button (main, value= 'exit', uvalue = 'exit') btn2 = widget_button (main, value= 'Rotate1', uvalue = 'Rotate1') btn4 = widget_button (main, value= 'Rotate2', uvalue = 'Rotate2') draw = widget_draw (main, XSIZE = 500, YSIZE = 500, uvalue='DRAW_WIN_EVENT', /button_ev, /FRAME, RETAIN = 2) widget_control, main, /realize xmanager, 'experiment2', main, /no_block A=-90 B=-0 MAP_SET, A,B,10,/ORTHOGRAPHIC,/ISOTROPIC,/GRID,/CONTINENTS,/LABEL,/HORIZON END