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Armera

Timing

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Quick question on timing. I simply just want to draw a 2D quad on the screen. I want to make it slide in to the center of the screen from the right. what would i do to the 4 values of the quad to make it achieve this over a period of 2 seconds? =] Jer

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well you pop open your high school physics book to find that:

v = d/t

say d = 100units or something and t=2
the v = 50u/s

well, know you need to find the change in time, deltaT, since the last frame...i''ll let you figure that one out(check the other threads concerning Frame Rate)

know if your using something like OpenGL do something like:


deltaD += v * deltaT;
glTranslatef(deltaD,0.0f,0.0f); // since you wanted to move right
DrawThePrettyQuad();

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