Mixing
iOS- How to paint in the within limits
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I used the scanning line seed filling algorithm to realize the color filling function.
But I don't know how to do that. When my pen lands in the flower, I need to draw only Inside the black edge of the flower,do not draw in the hair.
I have tried to use :
CALayer *layer = [CALayer layer];
layer.contents = (__bridge id)(image.CGImage);
self.drawView.layer.mask = layer;
But the plan didn't work.
if any one gives solution it would be so great,Thank you.
(English is not my native language; please excuse typing errors.)
ios opengl-es draw paint secret-garden
asked Jan 3 at 9:32
makemake
1,683248
add a comment |
I used the scanning line seed filling algorithm to realize the color filling function.
But I don't know how to do that. When my pen lands in the flower, I need to draw only Inside the black edge of the flower,do not draw in the hair.
I have tried to use :
CALayer *layer = [CALayer layer];
layer.contents = (__bridge id)(image.CGImage);
self.drawView.layer.mask = layer;
But the plan didn't work.
if any one gives solution it would be so great,Thank you.
(English is not my native language; please excuse typing errors.)
ios opengl-es draw paint secret-garden
asked Jan 3 at 9:32
makemake
1,683248
There is a similar question: How to draw inside the black edges in iOS SDK with OpenGL ES?
– Rabbid76
Jan 12 at 15:53
add a comment |
I used the scanning line seed filling algorithm to realize the color filling function.
But I don't know how to do that. When my pen lands in the flower, I need to draw only Inside the black edge of the flower,do not draw in the hair.
I have tried to use :
CALayer *layer = [CALayer layer];
layer.contents = (__bridge id)(image.CGImage);
self.drawView.layer.mask = layer;
But the plan didn't work.
if any one gives solution it would be so great,Thank you.
(English is not my native language; please excuse typing errors.)
ios opengl-es draw paint secret-garden
asked Jan 3 at 9:32
makemake
1,683248
I used the scanning line seed filling algorithm to realize the color filling function.
But I don't know how to do that. When my pen lands in the flower, I need to draw only Inside the black edge of the flower,do not draw in the hair.
I have tried to use :
CALayer *layer = [CALayer layer];
layer.contents = (__bridge id)(image.CGImage);
self.drawView.layer.mask = layer;
But the plan didn't work.
if any one gives solution it would be so great,Thank you.
(English is not my native language; please excuse typing errors.)
ios opengl-es draw paint secret-garden
ios opengl-es draw paint secret-garden
asked Jan 3 at 9:32
makemake
1,683248
asked Jan 3 at 9:32
makemake
1,683248
edited Jan 3 at 10:22
make
asked Jan 3 at 9:32
makemake
1,683248
asked Jan 3 at 9:32
makemake
1,683248
asked Jan 3 at 9:32
makemake
1,683248
1,683248
There is a similar question: How to draw inside the black edges in iOS SDK with OpenGL ES?
– Rabbid76
Jan 12 at 15:53
add a comment |
There is a similar question: How to draw inside the black edges in iOS SDK with OpenGL ES?
– Rabbid76
Jan 12 at 15:53
There is a similar question: How to draw inside the black edges in iOS SDK with OpenGL ES?
– Rabbid76
Jan 12 at 15:53
There is a similar question: How to draw inside the black edges in iOS SDK with OpenGL ES?
– Rabbid76
Jan 12 at 15:53
add a comment |
1 Answer
1
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oldest
votes
Use a two pass approach.
- Use the same algorithm as the fill algorithm to create a stencil mask which fills the area you want to allow the pen to draw.
- Draw the pen with stencil testing to constrain it to the allowed region.
Similar approach could be used to create an alpha-mask on the fly (e.g. as a texture), and mix that with the pen drawing.
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
Use a two pass approach.
- Use the same algorithm as the fill algorithm to create a stencil mask which fills the area you want to allow the pen to draw.
- Draw the pen with stencil testing to constrain it to the allowed region.
Similar approach could be used to create an alpha-mask on the fly (e.g. as a texture), and mix that with the pen drawing.
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
add a comment |
Use a two pass approach.
- Use the same algorithm as the fill algorithm to create a stencil mask which fills the area you want to allow the pen to draw.
- Draw the pen with stencil testing to constrain it to the allowed region.
Similar approach could be used to create an alpha-mask on the fly (e.g. as a texture), and mix that with the pen drawing.
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
add a comment |
Use a two pass approach.
- Use the same algorithm as the fill algorithm to create a stencil mask which fills the area you want to allow the pen to draw.
- Draw the pen with stencil testing to constrain it to the allowed region.
Similar approach could be used to create an alpha-mask on the fly (e.g. as a texture), and mix that with the pen drawing.
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
Use a two pass approach.
- Use the same algorithm as the fill algorithm to create a stencil mask which fills the area you want to allow the pen to draw.
- Draw the pen with stencil testing to constrain it to the allowed region.
Similar approach could be used to create an alpha-mask on the fly (e.g. as a texture), and mix that with the pen drawing.
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
edited Jan 3 at 13:25
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
answered Jan 3 at 13:16
solidpixelsolidpixel
5,30711223
5,30711223
add a comment |
add a comment |
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There is a similar question: How to draw inside the black edges in iOS SDK with OpenGL ES?
– Rabbid76
Jan 12 at 15:53