Direct2D C++ the easiest way to draw bottom half of an ellipse
0
I want to draw the bottom half of an ellipse. it better be portable. I would like to group several drawing commands in function and draw it in many places.
It would be better if not using bitmap kind of thing. I'd like the geometry cover less things as possible. Plus, it is more complicated. Still, it would be acceptable.
I am using C++ VS17 on Win10
direct2d
asked Nov 20 at 13:13
miehmg
34
add a comment |
0
I want to draw the bottom half of an ellipse. it better be portable. I would like to group several drawing commands in function and draw it in many places.
It would be better if not using bitmap kind of thing. I'd like the geometry cover less things as possible. Plus, it is more complicated. Still, it would be acceptable.
I am using C++ VS17 on Win10
direct2d
asked Nov 20 at 13:13
miehmg
34
add a comment |
0
0
0
I want to draw the bottom half of an ellipse. it better be portable. I would like to group several drawing commands in function and draw it in many places.
It would be better if not using bitmap kind of thing. I'd like the geometry cover less things as possible. Plus, it is more complicated. Still, it would be acceptable.
I am using C++ VS17 on Win10
direct2d
asked Nov 20 at 13:13
miehmg
34
I want to draw the bottom half of an ellipse. it better be portable. I would like to group several drawing commands in function and draw it in many places.
It would be better if not using bitmap kind of thing. I'd like the geometry cover less things as possible. Plus, it is more complicated. Still, it would be acceptable.
I am using C++ VS17 on Win10
direct2d
direct2d
asked Nov 20 at 13:13
miehmg
34
asked Nov 20 at 13:13
miehmg
34
edited Nov 20 at 13:32
asked Nov 20 at 13:13
miehmg
34
asked Nov 20 at 13:13
miehmg
34
asked Nov 20 at 13:13
miehmg
34
34
add a comment |
add a comment |
1 Answer
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Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.
answered Nov 20 at 22:46
bunglehead
6231617
I did that and get what I wanted. but this is not portable, right? although you can store the geometry, it's position is fixed when created.
– miehmg
Nov 21 at 0:36
Geometry is immutable, that's correct. To draw it at different coordinates you can use target/context transform around Draw*() call. I don't know what you mean by portable though.
– bunglehead
Nov 21 at 4:14
I group it into a function like drawHouse() in which I draw the geometry. but I need to draw house at many coordinates. before this answer, I pass the coordinates into the function and draw it there using run-time parameters. But I am concerned about whether this method will take more time and resources. As what I see in the msdn example, they store brushes, bitmaps etc. So I wonder if I can create a geometry and save it so that next time I draw it, it is more efficient.
– miehmg
Nov 23 at 13:53
Sure, if it's possible to create it once, you should do that. To draw it at different coordinates use SetTransform() on target/context you're using to add offset you need.
– bunglehead
Nov 23 at 16:05
add a comment |
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1 Answer
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1 Answer
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active
oldest
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oldest
votes
0
Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.
answered Nov 20 at 22:46
bunglehead
6231617
I did that and get what I wanted. but this is not portable, right? although you can store the geometry, it's position is fixed when created.
– miehmg
Nov 21 at 0:36
Geometry is immutable, that's correct. To draw it at different coordinates you can use target/context transform around Draw*() call. I don't know what you mean by portable though.
– bunglehead
Nov 21 at 4:14
I group it into a function like drawHouse() in which I draw the geometry. but I need to draw house at many coordinates. before this answer, I pass the coordinates into the function and draw it there using run-time parameters. But I am concerned about whether this method will take more time and resources. As what I see in the msdn example, they store brushes, bitmaps etc. So I wonder if I can create a geometry and save it so that next time I draw it, it is more efficient.
– miehmg
Nov 23 at 13:53
Sure, if it's possible to create it once, you should do that. To draw it at different coordinates use SetTransform() on target/context you're using to add offset you need.
– bunglehead
Nov 23 at 16:05
add a comment |
0
Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.
answered Nov 20 at 22:46
bunglehead
6231617
I did that and get what I wanted. but this is not portable, right? although you can store the geometry, it's position is fixed when created.
– miehmg
Nov 21 at 0:36
Geometry is immutable, that's correct. To draw it at different coordinates you can use target/context transform around Draw*() call. I don't know what you mean by portable though.
– bunglehead
Nov 21 at 4:14
I group it into a function like drawHouse() in which I draw the geometry. but I need to draw house at many coordinates. before this answer, I pass the coordinates into the function and draw it there using run-time parameters. But I am concerned about whether this method will take more time and resources. As what I see in the msdn example, they store brushes, bitmaps etc. So I wonder if I can create a geometry and save it so that next time I draw it, it is more efficient.
– miehmg
Nov 23 at 13:53
Sure, if it's possible to create it once, you should do that. To draw it at different coordinates use SetTransform() on target/context you're using to add offset you need.
– bunglehead
Nov 23 at 16:05
add a comment |
0
0
0
Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.
answered Nov 20 at 22:46
bunglehead
6231617
Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.
answered Nov 20 at 22:46
bunglehead
6231617
answered Nov 20 at 22:46
bunglehead
6231617
answered Nov 20 at 22:46
bunglehead
6231617
answered Nov 20 at 22:46
bunglehead
6231617
6231617
I did that and get what I wanted. but this is not portable, right? although you can store the geometry, it's position is fixed when created.
– miehmg
Nov 21 at 0:36
Geometry is immutable, that's correct. To draw it at different coordinates you can use target/context transform around Draw*() call. I don't know what you mean by portable though.
– bunglehead
Nov 21 at 4:14
I group it into a function like drawHouse() in which I draw the geometry. but I need to draw house at many coordinates. before this answer, I pass the coordinates into the function and draw it there using run-time parameters. But I am concerned about whether this method will take more time and resources. As what I see in the msdn example, they store brushes, bitmaps etc. So I wonder if I can create a geometry and save it so that next time I draw it, it is more efficient.
– miehmg
Nov 23 at 13:53
Sure, if it's possible to create it once, you should do that. To draw it at different coordinates use SetTransform() on target/context you're using to add offset you need.
– bunglehead
Nov 23 at 16:05
add a comment |
I did that and get what I wanted. but this is not portable, right? although you can store the geometry, it's position is fixed when created.
– miehmg
Nov 21 at 0:36
Geometry is immutable, that's correct. To draw it at different coordinates you can use target/context transform around Draw*() call. I don't know what you mean by portable though.
– bunglehead
Nov 21 at 4:14
I group it into a function like drawHouse() in which I draw the geometry. but I need to draw house at many coordinates. before this answer, I pass the coordinates into the function and draw it there using run-time parameters. But I am concerned about whether this method will take more time and resources. As what I see in the msdn example, they store brushes, bitmaps etc. So I wonder if I can create a geometry and save it so that next time I draw it, it is more efficient.
– miehmg
Nov 23 at 13:53
Sure, if it's possible to create it once, you should do that. To draw it at different coordinates use SetTransform() on target/context you're using to add offset you need.
– bunglehead
Nov 23 at 16:05
I did that and get what I wanted. but this is not portable, right? although you can store the geometry, it's position is fixed when created.
– miehmg
Nov 21 at 0:36
I did that and get what I wanted. but this is not portable, right? although you can store the geometry, it's position is fixed when created.
– miehmg
Nov 21 at 0:36
Geometry is immutable, that's correct. To draw it at different coordinates you can use target/context transform around Draw*() call. I don't know what you mean by portable though.
– bunglehead
Nov 21 at 4:14
Geometry is immutable, that's correct. To draw it at different coordinates you can use target/context transform around Draw*() call. I don't know what you mean by portable though.
– bunglehead
Nov 21 at 4:14
I group it into a function like drawHouse() in which I draw the geometry. but I need to draw house at many coordinates. before this answer, I pass the coordinates into the function and draw it there using run-time parameters. But I am concerned about whether this method will take more time and resources. As what I see in the msdn example, they store brushes, bitmaps etc. So I wonder if I can create a geometry and save it so that next time I draw it, it is more efficient.
– miehmg
Nov 23 at 13:53
I group it into a function like drawHouse() in which I draw the geometry. but I need to draw house at many coordinates. before this answer, I pass the coordinates into the function and draw it there using run-time parameters. But I am concerned about whether this method will take more time and resources. As what I see in the msdn example, they store brushes, bitmaps etc. So I wonder if I can create a geometry and save it so that next time I draw it, it is more efficient.
– miehmg
Nov 23 at 13:53
Sure, if it's possible to create it once, you should do that. To draw it at different coordinates use SetTransform() on target/context you're using to add offset you need.
– bunglehead
Nov 23 at 16:05
Sure, if it's possible to create it once, you should do that. To draw it at different coordinates use SetTransform() on target/context you're using to add offset you need.
– bunglehead
Nov 23 at 16:05
add a comment |
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