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Hey, I'm trying to completely white out a sprite when it gets hit, the sprites are children of a batchnode.
Using this code, I can tint the sprite fully black, but I have to use the rgb value for white to get it back to being coloured.
[self setColor:ccc3(0, 0, 0)];How can I fully white out the sprite, rather than black it out?
The sprite's color property is subtractive - that means that if you start with 255,255,255 you will get the color of the texture in memory and if the RGB values are anything less, you will remove color from the original texture. This means that you cannot add color to make it white but you can remove color to make it black.
To do an all white sprite you have two options that I can think of - first, if using a sprite batchnode, have an all white version of your sprite image in your batchnode and switch to that image when needed. Another option is to start with an all white sprite and tint it to the color of your liking for normal use, then when you want to make it white, set the RGB values to 255,255,255 (this method only works if you are fine with a monochrome image)
I hope this helps,
Dave
Thanks for your suggestions Dave but neither are feasible.
I can't have an all white sprite because the character could be hit at any point in his animation, so i'd need a whited out sprite for every animation frame.
The sprites are quite detailed in colour, having a white image and colouring it wouldn't work either.
Thanks for the help again, ill have to try find another way of doing it
@liquidfire Please try to be more constructive if you had read Bongeh's post you would know that he is already aware of your solution and also explained that isn't correct...
Sorry Bongeh I don't have an actual solution. Off the top of my head, I don't think its actually as simple as setting a color due to the limitations of the tint property. If you can afford the performance/memory the easiest way would be to have a white version of your sprite and then use its opacity over the color version.
David
Ok, i've accidentally worked out how to flash the entire window white...
Anyone know how i restrict this just to the sprite?
-(void) setGLTintR:(float) r andG:(float)g andB:(float)b andA:(float)a {
float fogCol[] = { r, g, b, 1.0 };
glFogfv( GL_FOG_COLOR, fogCol );
glFogf( GL_FOG_DENSITY, 1.0 );
glFogf( GL_FOG_START, -a );
glFogf( GL_FOG_END, (1.0 - a ));
// We don't need per-pixel fog, per-verted will do the same //
glHint( GL_FOG_HINT, GL_FASTEST );
glEnable( GL_FOG );
}Like stated above, you cant add color, only subtract, so in stead, make a white sprite copy, and blend them.
If you check my blog, a couple of posts down, there is a video showing a full screen blend from blurry BW movie style, to normal full screen color. This is done by blending sprites.
rakkarage
Member
this grayscale code can do it just change gray to white
http://www.cocos2d-iphone.org/forum/topic/10227#post-58662
UIImage *convertToWhite(UIImage * source)
{
CGSize size = [source size];
int width = size.width;
int height = size.height;
// the pixels will be painted to this array
uint32_t *pixels = (uint32_t *) malloc(width * height * sizeof(uint32_t));
// clear the pixels so any transparency is preserved
memset(pixels, 0, width * height * sizeof(uint32_t));
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
// create a context with RGBA pixels
CGContextRef context = CGBitmapContextCreate(pixels, width, height, 8, width * sizeof(uint32_t), colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedLast);
// paint the bitmap to our context which will fill in the pixels array
CGContextDrawImage(context, CGRectMake(0, 0, width, height), source.CGImage);
for(int y = 0; y < height; y++) {
for(int x = 0; x < width; x++) {
uint8_t *rgbaPixel = (uint8_t *) &pixels[y * width + x];
// convert to grayscale using recommended method: http://en.wikipedia.org/wiki/Grayscale#Converting_color_to_grayscale
uint32_t gray = 0.3 * rgbaPixel[rgbaRED] + 0.59 * rgbaPixel[rgbaGREEN] + 0.11 * rgbaPixel[rgbaBLUE];
// set the pixels to white
if (gray > 0)
{
rgbaPixel[rgbaRED] = 255;
rgbaPixel[rgbaGREEN] = 255;
rgbaPixel[rgbaBLUE] = 255;
}
}
}
// create a new CGImageRef from our context with the modified pixels
CGImageRef image = CGBitmapContextCreateImage(context);
// we're done with the context, color space, and pixels
CGContextRelease(context);
CGColorSpaceRelease(colorSpace);
free(pixels);
// make a new UIImage to return
UIImage *resultUIImage = [UIImage imageWithCGImage:image];
// we're done with image now too
CGImageRelease(image);
return resultUIImage;
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