Rotate Problem « cocos2d for iPhone

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Rotate Problem

(11 posts) (4 voices)

Started 2 years ago by imagex
Latest reply from imagex

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imagex
Member
I want to rotate a square and keep it at one position,but it's not always there(moved about 1 pixel).

The size of the image is 50x50.
```
[squareSprite setPosition: ccp(100, 100)];
[squareSprite setTransformAnchor: ccp(25,25)];

[squareSprite runAction:[RotateTo actionWithDuration:0.1f angle:90]];
```
Posted 2 years ago #
imagex
Member

Help please.

Posted 2 years ago #
Awebby
Member

Try

[squareSprite setTransformAnchor: ccp(0.5,0.5)];

Posted 2 years ago #
imagex
Member

Thank you, but it's not the result i wanted.

Posted 2 years ago #
imagex
Member

Anyone can give me some help? I've been stuck for 3 days.
It's a very important problem.

Posted 2 years ago #
rbrooky
Member

imagex:
Not sure but I believe due to the size of the image you're rotating, you will always keep an issue with a slight shift in position (1 pixel. You would like to try to set the anchorpoint in the middle of the image but with 50 pixels wide, you can't. The 25th pixel is right before the middle, the 26th is right after the middle. Can you make the image 51 pixels and set the achorpoint to (26,26)? Create an image of 49 pixels and anchorpoint (25,25) should get you the same

Don't blame it on cocos2d...

Posted 2 years ago #
imagex
Member

I tried 0.7.3 instead of 0.8, and added [director set2DProjection],then it was ok(size 50x50 anchor 25x25), but it was very slow,it cost about 5 seconds to enter the game.

Posted 2 years ago #
Codemattic
Moderator

In 0.8.rc2 try:

edit CocosNode.m and change:

#if 1
#define RENDER_IN_SUBPIXEL

with:

#if 0
#define RENDER_IN_SUBPIXEL

According to riq - in v0.8.1 the "render_in_subpixel" option will be part of the node, so you can have an sprite with that renders in subpixel and another sprite that only renders in integer pixels.

"but it was very slow,it cost about 5 seconds to enter the game"

hrmm, that doesnt make sense to me. Maybe the first time only if you need to load stuff. More code please.

Posted 2 years ago #
imagex
Member

When the code "[director set2DProjection]" removed, it takes no time.
I don't know what caused the problem, so I don't know what code should I paste.

The game contains about 100 small sprites(it's a game like pipe mania).

Posted 2 years ago #
Codemattic
Moderator

doesnt sound right. Is [director set2DProjection] called only once when you set up the game - or constantly in a draw method or something. Do you see the effect in the simulator and the device?

Posted 2 years ago #
imagex
Member

Only once.

Posted 2 years ago #

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