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xwtiko

sine curve motion

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xwtiko    122
Hello! I need some help in a program I am making. I want to fix a carousel - you know the kids game with the horses going up and down. My problem is how am I suposed to make the horses move like a sine curve. In the code I''ve writen so far z is the vertical axis ,x tha horizontal kai y the one with direction from me to the screen. Something like that. ^ z | __ y | /| | / | / |/ ------------|---------> x | | |

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Jenison    216
really all you need to do is calculate the sine for a given angle then apply those coords to your y value.

y = y + ((sin(angle) * radius) - (sin(previousangle) * radius));

previousangle = angle

taking the sin of the current angle minus the sin of the previous angle so handles the ''change over'' of direction

the first time through just set previous angle to the same as angle or handle a 0 & 359 condition.

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