How do I reset transformations to initial state?

Question

JWG 146

I would like to make transformation in a render, and then do another render, with all previous transformations removed.

Is there a way I can store the default state, and restore that after each render?

This doesn't do what I want, and I am using bitmaps.

I found HRESULT Reset(), but don't get any results.

Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2023-08-30T05:59:15.42+00:00

You can save the default transformation returned by ID2D1RenderTarget::GetTransform and then restore with ID2D1RenderTarget::SetTransform.

It's worth noting that there is an identity matrix.
JWG 146 Reputation points

2023-09-02T01:49:08.1333333+00:00

I can get transform at the start with rt->GetTransform(default), but wherever I use rt->SetTransform(default), an exception is thrown on the line above or below.

Nothing changes when I use rt->SetTransform(D2D1::Matrix3x2F::Identity()).
Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2023-09-04T01:25:29.5+00:00

There could be some issues in somewhere other. See the workable example and SetTransform(D2D1::Matrix3x2F::Identity()). Could you please show a minimal, reproducible sample without private information?

Your answer

Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2023-08-30T05:59:15.42+00:00

You can save the default transformation returned by ID2D1RenderTarget::GetTransform and then restore with ID2D1RenderTarget::SetTransform.

It's worth noting that there is an identity matrix.
JWG 146 Reputation points

2023-09-02T01:49:08.1333333+00:00

I can get transform at the start with rt->GetTransform(default), but wherever I use rt->SetTransform(default), an exception is thrown on the line above or below.

Nothing changes when I use rt->SetTransform(D2D1::Matrix3x2F::Identity()).
Xiaopo Yang - MSFT 12,736 Reputation points Microsoft External Staff

2023-09-04T01:25:29.5+00:00

There could be some issues in somewhere other. See the workable example and SetTransform(D2D1::Matrix3x2F::Identity()). Could you please show a minimal, reproducible sample without private information?