Updated FAQ (#628)

README.md

@@ -95,12 +95,14 @@ Frequently Asked Question (FAQ)
 The library started its life and is best known as "ImGui" only due to the fact that I didn't give it a proper name when I released it. However, the term IMGUI (immediate-mode graphical user interface) was coined before and is being used in variety of other situations. It seemed confusing and unfair to hog the name. To reduce the ambiguity without affecting existing codebases, I have decided on an alternate, longer name "dear imgui" that people can use to refer to this specific library in ambiguous situations.
 
 <b>How do I update to a newer version of ImGui?</b>
-<br><b>Can I have multiple widgets with the same label? Can I have widget without a label? (Yes)</b>
+<br><b>What is ImTextureID and how do I display an image?</b>
 <br><b>I integrated ImGui in my engine and the text or lines are blurry..</b>
 <br><b>I integrated ImGui in my engine and some elements are disappearing when I move windows around..</b>
+<br><b>How can I have multiple widgets with the same label? Can I have widget without a label? (Yes). A primer on the purpose of labels/IDs.</b>
 <br><b>How can I load a different font than the default?</b>
 <br><b>How can I load multiple fonts?</b>
 <br><b>How can I display and input non-latin characters such as Chinese, Japanese, Korean, Cyrillic?</b>
+<br><b>How can I use the drawing facilities without an ImGui window? (using ImDrawList API)</b>
 
 See the FAQ in imgui.cpp for answers.
 

imgui.cpp

@@ -20,12 +20,13 @@
    - How can I help?
    - How do I update to a newer version of ImGui?
    - What is ImTextureID and how do I display an image?
-   - Can I have multiple widgets with the same label? Can I have widget without a label? (Yes) / A primer on the use of labels/IDs in ImGui.
    - I integrated ImGui in my engine and the text or lines are blurry..
    - I integrated ImGui in my engine and some elements are clipping or disappearing when I move windows around..
+   - How can I have multiple widgets with the same label? Can I have widget without a label? (Yes). A primer on the purpose of labels/IDs.
    - How can I load a different font than the default?
    - How can I load multiple fonts?
    - How can I display and input non-latin characters such as Chinese, Japanese, Korean, Cyrillic?
+   - How can I use the drawing facilities without an ImGui window? (using ImDrawList API)
  - ISSUES & TODO-LIST
  - CODE
 
@@ -278,6 +279,13 @@
     ImGui will generate the geometry and draw calls using the ImTextureID that you passed and which your renderer can use.
     It is your responsibility to get textures uploaded to your GPU.
 
+ Q: I integrated ImGui in my engine and the text or lines are blurry..
+ A: In your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f).
+    Also make sure your orthographic projection matrix and io.DisplaySize matches your actual framebuffer dimension.
+
+ Q: I integrated ImGui in my engine and some elements are clipping or disappearing when I move windows around..
+ A: Most likely you are mishandling the clipping rectangles in your render function. Rectangles provided by ImGui are defined as (x1,y1,x2,y2) and NOT as (x1,y1,width,height).
+
  Q: Can I have multiple widgets with the same label? Can I have widget without a label? (Yes)
  A: Yes. A primer on the use of labels/IDs in ImGui..
 
@@ -371,13 +379,6 @@
       e.g. when displaying a single object that may change over time (1-1 relationship), using a static string as ID will preserve your node open/closed state when the targeted object change.
       e.g. when displaying a list of objects, using indices or pointers as ID will preserve the node open/closed state differently. experiment and see what makes more sense!
 
- Q: I integrated ImGui in my engine and the text or lines are blurry..
- A: In your Render function, try translating your projection matrix by (0.5f,0.5f) or (0.375f,0.375f).
-    Also make sure your orthographic projection matrix and io.DisplaySize matches your actual framebuffer dimension.
-
- Q: I integrated ImGui in my engine and some elements are clipping or disappearing when I move windows around..
- A: Most likely you are mishandling the clipping rectangles in your render function. Rectangles provided by ImGui are defined as (x1,y1,x2,y2) and NOT as (x1,y1,width,height).
-
  Q: How can I load a different font than the default? (default is an embedded version of ProggyClean.ttf, rendered at size 13)
  A: Use the font atlas to load the TTF file you want:
 
@@ -424,6 +425,10 @@
 
     As for text input, depends on you passing the right character code to io.AddInputCharacter(). The example applications do that.
 
+ Q: How can I use the drawing facilities without an ImGui window? (using ImDrawList API)
+ A: The easiest way is to create a dummy window. Call Begin() with NoTitleBar|NoResize|NoMove|NoScrollbar|NoSavedSettings|NoInputs flag, zero background alpha, 
+    then retrieve the ImDrawList* via GetWindowDrawList() and draw to it in any way you like.
+
  - tip: the construct 'IMGUI_ONCE_UPON_A_FRAME { ... }' will run the block of code only once a frame. You can use it to quickly add custom UI in the middle of a deep nested inner loop in your code.
  - tip: you can create widgets without a Begin()/End() block, they will go in an implicit window called "Debug"
  - tip: you can call Begin() multiple times with the same name during the same frame, it will keep appending to the same window. this is also useful to set yourself in the context of another window (to get/set other settings)
@@ -565,6 +570,7 @@
  - style editor: have a more global HSV setter (e.g. alter hue on all elements). consider replacing active/hovered by offset in HSV space? (#438)
  - style editor: color child window height expressed in multiple of line height.
  - remote: make a system like RemoteImGui first-class citizen/project (#75)
+ - drawlist: move Font, FontSize, FontTexUvWhitePixel inside ImDrawList and make it self-contained (apart from drawing settings?)
  - drawlist: end-user probably can't call Clear() directly because we expect a texture to be pushed in the stack.
  - examples: directx9: save/restore device state more thoroughly.
  - examples: window minimize, maximize (#583)