scrolling an image

[Zhiquan]

supposing i have a really big image.... whats the best way to allow the user to scrool around it?

[riis]

I prefer dragging the image much over using scrollbars. (Probably because there's much more room to click than in the narrow scrollbars, and over all because you can "scroll" diagonally.) I have no idea how others think about it.
(For performance issues you might want to only register the mousedown- and mouseup-events, and not dynamically drag the image in the mousemove-event.)

[anjulpa]

maybe he's talking abt how to handle such a large image in memory and to load the right parts at the right events.

[riis]

I don't know, he didn't make it clear.

[Zhiquan]

Originally posted by riis
I prefer dragging the image much over using scrollbars. (Probably because there's much more room to click than in the narrow scrollbars, and over all because you can "scroll" diagonally.) I have no idea how others think about it.
(For performance issues you might want to only register the mousedown- and mouseup-events, and not dynamically drag the image in the mousemove-event.)

that's what i want to do drag the picture around, but how do i go about doing it?

[anjulpa]

maybe u should make it real time if you want to make it fast enuf for gaming. If you specify the right purpose then maybe you could get some help

[Zhiquan]

ok, what i have is this really large image of a technology tree. I just want to be able to allow the user to scroll around the picture by dragging the mouse. What i have in palce now uses scrollbars.

It doesn't need to be *very* fast

[Sastraxi]

Don't have a large image if it's all text. Generate it at run-time and you'll simply be able to offset the individual X and Y positions of the text, pictures, and/or controls you use.

[Zhiquan]

Originally posted by Sastraxi
Don't have a large image if it's all text. Generate it at run-time and you'll simply be able to offset the individual X and Y positions of the text, pictures, and/or controls you use.

its not all text, there are icons as well

[anjulpa]

i think sastraxi is right abt the run-time thing. Even if there are icons, you can hold certain of them in memory and display appropriate ones at the right positions, would be a hell lot faster.