What a train of thought is logging software scrolling drawing? Don't do this, the thinking of you want to have the following 3 kinds, don't know how the mainstream approach is implemented?
1, it is a one-off create a very large memory DC all draw depth line background grid, then slowly draw curve, by measuring data timing copy one screen at a screen to display area, through the position of the scroll bar to select the location of the memory bitmap paste to the screen,
2, the fixed every screen display the depth of 30 meters, creating a memory dc and full screen size of the screen, then refresh once again on the dc all re-paint, map display to the screen, after the completion of the scroll bar position control data in the array data shown in the drawing, the choice of location in
3, each screen 30 meters, but only to create a memory dc, the size of 10 meters paste 10 meters to the screen at a time, in the depth of the order, according to
I think of his thoughts, had trouble logging curve to help give directions?