want to represent cities of us on a windows form using latitude and longitude of the cities

I am trying to p开发者_如何学JAVAlot cities on a windows form using their lat longs, i cannot convert them to pixels, can any one help with the right code. I kept a map image as background to the window such that cities appear at correct place. So size of the window is the major resource for me to plot. Thankyou

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Calculate the lat-lon of the four corners of the form. Then using the form size and the difference between the lat-lon, you can get a factor to multiply by to get the location in the form.

For example, if the form's left side is at longitude -125, and the right side is -65, the width of the form in degrees is 60. If the actual width (me.width) of the form is 800, you would multiple the longitude of a city by 800 / 60 , or 13.33, minus the left longitude (-125). So Denver, at 105 West longitude, would be located at 20 * 13.33 or 267 in the form.

Do the same thing for the latitude (Y value).