Polygon rotation is too fast compared to objects rotation
Author
While trying to check, i made the rotation manual.... the polygon is still rotating faster. Its not the framerate, its the way the polygon is rotating using the polygon rotation method above or the method used to rotate the sprite.
Author
There is something wrong with the polygon rotation method... I watched the degrees subtract and the polygon was still rotating the other way.. as the degree increased it went left as the degree decreased it still went left, instead of right.
Please post both rotation methods and their calling context.
Additionally, what is responsible for calculating deltaTime? Is it the elapsed time since last frame?
Additionally, what is responsible for calculating deltaTime? Is it the elapsed time since last frame?
Author
The polygon rotation method is
The sprite rotation is done through a libgdx spritebatch and I am certain its correct.
The delta time comes from libgdx and is the time since last frame.
I am almost certain its something in the polygon rotation code... I was testing it... it would rotate until a certain point and then go the other way.
public void rotate(float x0, float y0, double angle) {
Log.i("Polygon", "Degree: " + angle);
for(int i = 0; i < mPoints.size(); i++) {
Point point = mPoints.get(i);
float x = (float) (x0 + (point.x - x0) * Math.cos(Utilities.toRadians(angle)) -
(point.y - y0) * Math.sin(Utilities.toRadians(angle)));
float y = (float) (y0 + (point.x - x0) * Math.sin(Utilities.toRadians(angle)) +
(point.y - y0) * Math.cos(Utilities.toRadians(angle)));
point.x = x;
point.y = y;
}
}
The sprite rotation is done through a libgdx spritebatch and I am certain its correct.
public void draw(SpriteBatch batch, float x, float y, float degree) {
batch.draw(mImage, x - width() / 2, y - height() / 2,
pivotX(), pivotY(),
width(), height(),
mScale, mScale,
degree,
0, 0,
(int) width(), (int) height(),
false, false);
}
The delta time comes from libgdx and is the time since last frame.
float deltaTime = Gdx.graphics.getDeltaTime();
I am almost certain its something in the polygon rotation code... I was testing it... it would rotate until a certain point and then go the other way.
Your update method:
public void update(float deltaTime) {
mAccumulatedTime += deltaTime;
while(mAccumulatedTime > FIXED_FRAME_TIME) {
mAccumulatedTime -= FIXED_FRAME_TIME;
if(isActive()) {
rotate();
mBounding.rotate(mPosition.x, mPosition.y, mDegree);
drawBounding();
}
}
}
[/quote]
What does rotate() do? Because by your explanation, mBounding.rotate handles the collision object rotation, and the sprite for the object is rotated by the spritebatch call.
If the sprite is being rotated by a spritebatch call, you should be giving it the same degree value that mBounding.rotate receives. Is that the case?
Author
They both recieve the same mDegree value.
Could it be something with the way i move the degree past 0?
Could it be something with the way i move the degree past 0?
if(mDegree > 360) {
mDegree = 0;
} else if(mDegree < 0) {
mDegree = 360;
}
Does the SpriteBatch draw method deffinitely take the angle in degrees and not radians?
Could you show us how SpriteBatch uses mDegree?
Is this the same SpriteBatch method as referred to here?
http://tylerforsythe.com/2011/11/xna-spritebatch-draw-and-icecream-use-a-rotation-value-in-radians/
On second thoughts I see that is a different SpriteBatch
Could you show us how SpriteBatch uses mDegree?
Is this the same SpriteBatch method as referred to here?
http://tylerforsythe.com/2011/11/xna-spritebatch-draw-and-icecream-use-a-rotation-value-in-radians/
On second thoughts I see that is a different SpriteBatch
Author
the draw method i use is above, but spritebatch deffinitely uses degrees
its located here https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/SpriteBatch.java
its located here https://github.com/libgdx/libgdx/blob/master/gdx/src/com/badlogic/gdx/graphics/g2d/SpriteBatch.java
Author
This method is better for fixing the degree but it didnt change the behavior that I am experiencing
if(mDegree >= 360) {
mDegree -= 360;
} else if(mDegree < 0) {
mDegree += 360;
}
Is this a funciton you've defined yourself "Utilities.toRadians()"? If so can you post the code?
Is there a reason why you aren't using "Math.toRadians()"?
Is there a reason why you aren't using "Math.toRadians()"?
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