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// Widgets not directly related to drawing UI.
// Returns a normalized UV position of the composition
static v2
ImGui_ScreenPointToCompUV(ImVec2 ViewportMin, ImVec2 CompPos, ImVec2 CompZoom, ImVec2 MousePos)
{
ImVec2 LocalMousePos = MousePos - ViewportMin;
ImVec2 LocalCompPos = CompPos - ViewportMin;
ImVec2 MouseScreenUV = LocalMousePos - LocalCompPos;
ImVec2 Result = MouseScreenUV / CompZoom;
return V2(Result);
}
// NOTE(fox): We have to do a bit of hackery here to tell how many times the
// mouse has been warped during a drag, since it doesn't seem like we can rely
// on SDL_WarpMouseGlobal to update on the first frame of a WantSetPos request.
static void
ImGui_WarpMouse(ui *UI, ImVec2 MousePos, ImVec2 Min, ImVec2 Max, int Direction = 3)
{
if (Direction & 1) {
if (MousePos.x < Min.x) {
UI->Warp_WantSetPos = true;
UI->Warp_PositionToSet = ImVec2(Max.x - 5, MousePos.y);
UI->Warp_PositionInitial = MousePos.x;
UI->Warp_Direction = 0;
}
if (MousePos.x > Max.x) {
UI->Warp_WantSetPos = true;
UI->Warp_PositionToSet = ImVec2(Min.x + 5, MousePos.y);
UI->Warp_PositionInitial = MousePos.x;
UI->Warp_Direction = 1;
}
}
if (Direction & 2) {
if (MousePos.y < Min.y) {
UI->Warp_WantSetPos = true;
UI->Warp_PositionToSet = ImVec2(MousePos.x, Max.y - 5);
UI->Warp_PositionInitial = MousePos.y;
UI->Warp_Direction = 2;
}
if (MousePos.y > Max.y) {
UI->Warp_WantSetPos = true;
UI->Warp_PositionToSet = ImVec2(MousePos.x, Min.y + 5);
UI->Warp_PositionInitial = MousePos.y;
UI->Warp_Direction = 3;
}
}
}
// We record the initial position and the direction of the wrap, and only
// increment the wrap amount when MousePos actually is measured to be what we expect.
static void
ImGui_WarpMouseFinish(ui *UI, ImVec2 MousePos)
{
if (UI->Warp_Direction == 0) {
if (MousePos.x < UI->Warp_PositionInitial) UI->Warp_X--;
} else if (UI->Warp_Direction == 1) {
if (MousePos.x > UI->Warp_PositionInitial) UI->Warp_X++;
} else if (UI->Warp_Direction == 2) {
if (MousePos.y < UI->Warp_PositionInitial) UI->Warp_Y--;
} else if (UI->Warp_Direction == 3) {
if (MousePos.y > UI->Warp_PositionInitial) UI->Warp_Y++;
} else {
Assert(0);
}
}
static ImVec2
ImGui_Brush_CalcMousePos(project_state *State, ImGuiIO &io, ImVec2 MouseDelta, int32 i, real32 DeltaDistance, real32 DeltaSlope)
{
ImVec2 MousePos;
if (State->Brush.Type == brush_normal) {
MousePos = io.MousePos - (MouseDelta * (i / DeltaDistance));
} else if (State->Brush.Type == brush_wacky1) {
MousePos = io.MousePos + (io.MousePos * (i / MouseDelta));
} else if (State->Brush.Type == brush_wacky2) {
MousePos = io.MousePos - (MouseDelta / (i / DeltaDistance));
} else if (State->Brush.Type == brush_wacky3) {
MousePos = io.MousePos - (MouseDelta * (i / ImVec2(MouseDelta.y, MouseDelta.x)));
} else {
Assert(0);
}
return MousePos;
}
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