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Expand on texture coordinates exmaples

omar 2022-02-07 11:58:07 +01:00
parent cb5b8b24da
commit 7911b36b75
1 changed files with 19 additions and 0 deletions
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19
Image-Loading-and-Displaying-Examples.md

@ -553,6 +553,25 @@ ImGui::Text("uv1 = (%f, %f)", uv1.x, uv1.y);
ImGui::Image((void*)(intptr_t)my_image_texture, ImVec2(100.0f, 200.0f), uv0, uv1);
```
Same code written differently:
```cpp
ImVec2 display_min = ImVec2(10.0f, 10.0f);
ImVec2 display_size = ImVec2(100.0f, 200.0f);
// Normalized coordinates of pixel (10,10) in a 256x256 texture.
ImVec2 uv0 = ImVec2(display_min.x / 256.0f, display_min.y / 256.0f);
// Normalized coordinates of pixel (110,210) in a 256x256 texture.
ImVec2 uv1 = ImVec2((display_min.x + display_size.x) / 256.0f, (display_min.y + display_size.y) / 256.0f);
ImGui::Text("uv0 = (%f, %f)", uv0.x, uv0.y);
ImGui::Text("uv1 = (%f, %f)", uv1.x, uv1.y);
// Display the 100x200 section starting at (10,10)
ImGui::Image((void*)(intptr_t)my_image_texture, ImVec2(display_size.x, display_size.y), uv0, uv1);
```
![Using UV](https://user-images.githubusercontent.com/8225057/79073825-f9988280-7ce8-11ea-8596-1fd495720ffa.png)
You can look up "texture coordinates" from other resources such as your favorite search engine, or graphics tutorials.