Helper for ColorPicker4()

Note: as with every ImDrawList drawing function, this expects that the font atlas texture is bound.

Rendering callback

copied from imgui/backends/imgui_impl_opengl2.cpp

Clear and initialize empty settings instance

Adjust flags: default width mode + stretch columns are not allowed when auto extending

Pop trailing draw command (used before merging or presenting to user) Note that this leaves the ImDrawList in a state unfit for further commands, as m

Initialize before use in a new frame. We always have a command ready in the buffer.

traverse the layout to locate the nearest character to a display position

API click: on mouse down, move the cursor to the clicked location, and reset the selection

discard the oldest entry in the undo list

find the x/y location of a character, and remember info about the previous row in case we get a move-up event (for page up, we'll have to rescan)

canoncialize the selection so start <= end

find minimum y position if it starts at x1

rects array must be big enough to accommodate all characters in the given ranges

check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string

Cubic Bezier takes 4 controls points

Quadratic Bezier takes 3 controls points

Pass in translated ASCII characters for text input. - with glfw you can get those from the callback set in glfwSetCharCallback() - on Windows you can

Queue a mouse move event

Guaranteed to honor 'num_segments'

Guaranteed to honor 'num_segments'

Compare to detect usage errors

Cursor & Selection

After a user-input the cursor stays on for a while without blinking