Direct2D C++ the easiest way to draw bottom half of an ellipse












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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










share|improve this question





























    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










    share|improve this question



























      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










      share|improve this question
















      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






      share|improve this question















      share|improve this question













      share|improve this question




      share|improve this question








      edited Nov 20 '18 at 13:32







      miehmg

















      asked Nov 20 '18 at 13:13









      miehmgmiehmg

      34




      34
























          1 Answer
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          0














          Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.






          share|improve this answer
























          • 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 '18 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 '18 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 '18 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 '18 at 16:05











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          1 Answer
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          active

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          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          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.






          share|improve this answer
























          • 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 '18 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 '18 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 '18 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 '18 at 16:05
















          0














          Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.






          share|improve this answer
























          • 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 '18 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 '18 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 '18 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 '18 at 16:05














          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.






          share|improve this answer













          Create path geometry, then do Open()->sink->AddArc() (twice with appropriate parameters)->Close(). Now you have your geometry that you can draw.







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Nov 20 '18 at 22:46









          bungleheadbunglehead

          6431718




          6431718













          • 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 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 '18 at 16:05




















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