Processing 1.0 - Processing Discourse - Rotating an image to pre-set positions

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Index › Programming Questions & Help › Programs › Rotating an image to pre-set positions

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Rotating an image to pre-set positions (Read 902 times)

koser

Rotating an image to pre-set positions
Jun 15^th, 2008, 2:28pm

Hi
I'm doing a project where I'm using a WiTilt sensor to control the rotation of an image.
I've defined 8 positions for the WiTilt and then want to rotate the image accordingly.
So I need the image to rotate(with animation of the rotation) to a specific position.

Can anyone help me on how to do so?

(How can I post my code - it's to long?)

antiplastik

Re: Rotating an image to pre-set positions
Reply #1 - Jun 16^th, 2008, 10:49am

I would do something like this (extend the PImage class) :

Quote:

class RotatingImage extends PImage {

float angle;
float angleToReach;
boolean mustBeRotated;
float rotationStep;

void setAngleToReach(float angleToReach, int direction) {
// set the rotationStep depending on direction and angle to reach
// set mustBeRotated to true
}

void rotateIfNeeded(float angle) {
// if the angleToReach has been reached, stop (mustBeRotated = false)
// otherwise, increase the angle using the rotationStep value
}

void display() {
// rotate before display
pushMatrix();
rotate(angle);
image(this, 0, 0);
popMatrix();
}

}

When your image needs to be rotated to a specific position (angle), call setAngleToReach().

Then, in the draw loop, call :
Code:

void draw() {
  ...
  myRotatingImage.rotateIfNeeded();
  myRotatingImage.display();
}

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