I created a rounded rectangle on illustrator and export in to png , then added this image to texturepacker and import to cocos2d here is my rectangle,
Have you any idea why there are white pixels on the corner.
Here is image https://dl.dropboxusercontent.com/u/9018754/Screen%20Shot%202014-07-31%20at%2023.28.52.png
Might be that the image was written as png8 with blending towards a white background in Illustrator.
Can you also post the png you created from Illustrator?
-- update --
The image looks fine. I think we can rule out problems with exporting the image.
In your settings "Premultiply Alpha" is off. When importing the image into cocos2d, did you enabled premultipled alpha?
Both values must be matching. Otherwise you will get some strange behaviour.
If it's on in TexturePacker and off in cocos2d you get black outlines.
If it's off in TexturePacker and on in cocos2d you get white outlines.
So: Try enabling it in TexturePacker.
Yes Premultiply Alpha solved my problem
Changing ccConfig.h to
#ifndef CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL
#define CC_FIX_ARTIFACTS_BY_STRECHING_TEXEL 1
#endif
and setting premultiply alpha + exclude 1 solved my problem ,
It is written in the comment line
**
` If enabled, the texture coordinates will be calculated by using this formula:
- texCoord.left = (rect.origin.x*2+1) / (texture.wide*2);
- texCoord.right = texCoord.left + (rect.size.width*2-2)/(texture.wide*2);
The same for bottom and top.
This formula prevents artifacts by using 99% of the texture.
The "correct" way to prevent artifacts is by using the spritesheet-artifact-fixer.py or a similar tool.
Affected nodes:
- CCSprite / CCSpriteBatchNode and subclasses: CCLabelBMFont, CCTMXLayer
- CCLabelAtlas
- CCParticleSystemQuad
- CCTileMap
To enabled set it to 1. Disabled by default.
**
I couldnt figure out what is going on at the moment but I will check code deeper ,
Thank you Andreas Löw
Related
I have a black area around my image and I want to create a mask using OpenCV C++ that selects just this black area so that I can paint it later. How can i do that without affecting the image itself?
I tried to convert the image to grayscale and then using threshold to convert it to binary, but it affects my image since the result contains black pixels from inside the image.
Another Question : if i want to crop the image instead of paint it, how can i do it??
Thanks in advance,
I would solve the problem like this:
Inverse-binarize the image with a threshold of 1 (i.e. all pixels with the value 0 are set to 1, all others to 0)
use cv::findContours to find white segments
remove segments that don't touch image borders
use cv::drawContours to draw the remaining segments to a mask.
There is probably a more efficient solution in terms of runtime efficiency, but you should be able to prototype my solution quite quickly.
I'm getting a strange effect while scaling up a CCSprite loaded from a PVR texture. My original sprite is a simple solid color rectangle but I end up having a dithered color from both edges (left and right) with big scaling (ex: [mySprite setScaleX:100.0]). Note that this doesn't occur when I load my sprite from a standalone PNG file. Any idea what goes wrong or what special parameter could be missing ? BTW, I use TexturePacker and generating PNG textures is not better.
Thx.
[UPDATE] First image is the base sprite I want to expand ("test.png", real size is 3x30pix, here I zoomed 4 times for visibility purpose).
Second image is the expected result (the one I get when loaded from a standalone PNG file).
Code used:
aSprite = [CCSprite spriteWithFile:#"test.png"];
[self addChild:aSprite];
[aSprite setScaleX:300.0];
Third image is the result when loaded from the PVR texture.
Code used:
aSprite = [CCSprite spriteWithSpriteFrameName:#"test"];
[self addChild:aSprite];
[aSprite setScaleX:300.0];
I have a CCSprite which gradually needs to be exhausted linearly from one end, lets say from left to right.For this purpose ,I am trying to change the textureRect property of the sprite so that the part that got exhausted from one end is 'outside' the displaying frame of the sprite.
I did this sort of thing before with a sprite that gets loaded from a spritesheet.And it worked perfectly.But I created this CCSprite using CCRenderTexture and by changing the textureRect property,the entire sprite gets disappeared.
The first image is the original CCSprite which I get from CCRenderTexture.The second image shows what I want to achieve.The black dotted rectangular portion of the Sprite needs to be omitted out.Only the blue dotted portion of the sprite needs to be displayed.Essentially,this blue dotted rectangle is my textureRect.
Is there any way how I could make my sprite reduce from one end.
Also is there any difference between a sprite created normally,and one created using CCRenderTexture.
I have done similar thing like this before using some low-level hack.
There is a work around solution if you use CCProgressTimer, that's very easy and I think it should be enough for your examples.
But you said in comment that you have some special requirements like "exhaust it from both the ends at once" then some low-level hack is needed. My solution from my last object is:
1) Get the texture image's raw data. In cocos2d you can use CCRenderTexture and in cocos2d-x you can use CCImage.
2) CCRenderTexture has a method of - (BOOL) saveToFile: (NSString *) name
format: (tCCImageFormat) format
. You can read its source code then try to save it into an 2D array instead like byte raw[1024][768]. Each element in this array represents one pixel on your picture(the type may not be byte, I'm not sure, nearly forget the details). The format MUST BE PNG since transparency will be needed.
3) Modify raw data directly, set pixel's transparency to 0x0 which you want it to disappear.
4) Re-initialize a CCRenderTexture using picture data you modified.
I can't provide the code directly since is a trade secret and core part of one of my projects. But I can share you my solution. You also need some knowledge about how PNG file works. Read:
https://en.wikipedia.org/wiki/Portable_Network_Graphics#File_header
Turns out I was making a silly mistake.While supplying values to the textureRect(CGRect),I was actually setting the textureRect.origin.y to the height of the texture which made my textureRect go beyond(above) the texture area.This explains why they were disappearing.
Thanks for reading.
I'm working on a setup in Cocos2D 1.x where I have a huge CCLayerPanZoom in a scene with free panning and zooming.
Every frame, I have to additionally draw a CCRenderTexture on top to create "darkness" (I'm cutting out the light). That works well.
Now I've added single sprites to the surface, and they are managed by Box2D. That works as well. I can translate to the RenderTexture where the light sources ought to be, and they render fine.
And then I wanted to add a HUD layer on top, by adding a CCLayer to the scene. That layer needs to contain several sprites stacked on top of each other, as user interface elements.
Only, all of these elements fail to draw where I need them to be: Exactly in the center of screen. The Sprites added onto the HUD layer are all off, and I have iterated through pretty much every variation "convertToWorldSpace", "convertToNodeSpace", etc.
It is as if the constant scaling by the CCPanZoomLayer in the background throws off anchor points in the layer above each frame, and resetting them doesn't help. They all seem to default into one of the corners of the node bounding box they are attached to, as if their transform is blocked or set to zero when it comes to the drawing.
Has anyone run into this problem? Is this a known issue when using CCLayerPanZoom and drawing a custom CCRenderTexture on top each frame?
Ha! I found the culprit! There's a bug in Cocos2D' way of using Zwoptex data. (I'm using Cocos2D v 1.0.1).
It seems that when loading in Zwoptex v3 data, sprite frames' trim offset data is ignored when the actual sprite frame anchor point is computed. The effect is that no anchor point on a sprite with trim offset in its definition (eg in the plist) has its anchor point correctly set. Really strange... I wonder whether this has occurred to anybody else? It's a glaring issue.
Here's how to reproduce:
Create any data for a sprite frame in zwoptex v3 format (the one that uses the trim data). Make sure you actually have a trimmed sprite, i.e. offset must be larger than zero, and image size must be larger than source.
Load in sprite, and try to position it at center of screen. You'll see it's off. Here's how to compute your anchor point correctly:
CCSprite *floor = [CCSprite spriteWithSpriteFrameName:#"Menu_OmeFloor.png"]; //create a sprite
CCSpriteFrame *frame=[[CCSpriteFrameCache sharedSpriteFrameCache] spriteFrameByName:#"Menu_OmeFloor.png"]; //get its frame to access frame data
[floor setTextureRectInPixels:frame.rect rotated:frame.rotated untrimmedSize:frame.originalSizeInPixels]; //re-set its texture rect
//Ensure that the coordinates are right: Texture frame offset is not counted in when determining normal anchor point:
xa = 0.5 + (frame.offsetInPixels.x / frame.originalSizeInPixels.width);
ya = 0.5 + (frame.offsetInPixels.y / frame.originalSizeInPixels.height);
[floor setAnchorPoint:ccp(xa,ya)];
floor.position=(where you need it);
Replace the 0.5 in the xa/ya formula with your required anchor point values.
I am using a LPDIRECT3DTEXTURE9 to hold my image.
This is the function used to display my picture.
int drawcharacter(SPRITE& person, LPDIRECT3DTEXTURE9& image)
{
position.x = (float)person.x;
position.y = (float)person.y;
sprite_handler->Draw(
image,
&srcRect,
NULL,
&position,
D3DCOLOR_XRGB(255,255,255));
return 0;
}
According to the book I have the RGB colour shown as the last parameter will not be displayed on screen, this is how you create transparency.
This works for the most part but leaves a pink line around my image and the edge of the picture. After trial and error I have found that if I go back into photoshop I can eliminate the pink box by drawing over it with the pink colour. This can be see with the ships on the left.
I am starting to think that photoshop is blending the edges of the image so that background is not all the same shade of pink though I have no proof.
Can anyone help fix this by programming or is the error in the image?
If anyone is good at photoshop can they tell me how to fix the image, I use png mostly but am willing to change if necessary.
edit: texture creation code as requested
character_image = LoadTexture("character.bmp", D3DCOLOR_XRGB(255,0,255));
if (character_image == NULL)
return 0;
You are loading a BMP image, which does not support transparency natively - the last parameter D3DCOLOR_XRGB(255,0,255) is being used to add transparency to an image which doesn't have any. The problem is that the color must match exactly, if it is off even by only one it will not be converted to transparent and you will see the near-magenta showing through.
Save your images as 24-bit PNG with transparency, and if you load them correctly there will be no problems. Also don't add the magenta background before you save them.
As you already use PNG, you can just store the alpha value there directly from Photoshop. PNG supports transparency out of the box, and it can give better appearance than what you get with transparent colour.
It's described in http://www.toymaker.info/Games/html/textures.html (for example).
Photoshop is anti-aliasing the edge of the image. If it determines that 30% of a pixel is inside the image and 70% is outside, it sets the alpha value for that pixel to 70%. This gives a much smoother result than using a pixel-based transparency mask. You seem to be throwing these alpha values away, is that right? The pink presumably comes from the way that Photoshop displays partially transparent pixels.