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Odd Shaped Bitmaps

Started by IGotdaQuestion Dec 8, 2002 at 2:02 PM 4 replies 250+ views

Original Post

Dec 8, 2002 at 2:02 PM

Not sure if this is correct board but anyway. Lets say I have a square with coords of (x1, y1) (x2, y2) (x3, y3) (x4, y4), ok and I can find angles of the line segements that are the sides using trig funcs. but I want to know is How can I display a bitmap (or graphic) within the square knowing only the coords, angles, and lengths?

MattS423

Dec 8, 2002 at 7:50 PM

Well, I''m not sure I know what your saying, but if you know the coordinates of the top-left corner, and the dementions (hieght & width), you can simply blt the bitmap onto the screen...

IGotdaQuestion

Author

IGotdaQuestion

Dec 8, 2002 at 11:04 PM

I''m saying its like:
Width of top = 10 units
Width of bottom = 5 units
Height of left = 20 units
Height of right = 2 units
Odd shaped, so any quad. that can exist how do I blt it to that?

MattS423

Dec 10, 2002 at 1:28 PM

ok, I have no clue about how to do that.

[edited by - MattS423 on December 10, 2002 2:29:17 PM]

JonnyQuest

Dec 11, 2002 at 8:07 AM

Two textured triangles. Apart from that, the quad you just specified does not actually exist... (think about it)

- JQ
Full Speed Games. Are back.

Yann L

219

Yann L

Dec 11, 2002 at 11:52 AM

As JQ said. The quad you described cannot exist in Euclidean space.

The solution is to specify the coordinates of the corner points (vertices), instead of the side lengths. You don''t need more than that, the four 2D coorindates are enough to display the quad. That''s the principle of vector graphics.

To actually display it, you''ll have to use a scanline rendering algorithm. You could alternatively alos use 3D hardware, it works by the same principles and is going to be a lot faster.

/ Yann

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