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Added CalcItemRectClosestPoint() helper.

This commit is contained in:
ocornut 2015-03-18 13:07:37 +00:00
parent 9f1b407def
commit dcaafffe0e
2 changed files with 22 additions and 2 deletions
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23
imgui.cpp
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@ -900,8 +900,19 @@ struct ImRect // 2D axis aligned bounding-box
bool Overlaps(const ImRect& r) const { return r.Min.y <= Max.y && r.Max.y >= Min.y && r.Min.x <= Max.x && r.Max.x >= Min.x; }
void Add(const ImVec2& rhs) { Min.x = ImMin(Min.x, rhs.x); Min.y = ImMin(Min.y, rhs.y); Max.x = ImMax(Max.x, rhs.x); Max.y = ImMax(Max.x, rhs.x); }
void Add(const ImRect& rhs) { Min.x = ImMin(Min.x, rhs.Min.x); Min.y = ImMin(Min.y, rhs.Min.y); Max.x = ImMax(Max.x, rhs.Max.x); Max.y = ImMax(Max.y, rhs.Max.y); }
void Expand(const ImVec2& sz) { Min -= sz; Max += sz; }
void Expand(const float amount) { Min.x -= amount; Min.y -= amount; Max.x += amount; Max.y += amount; }
void Expand(const ImVec2& amount) { Min -= amount; Max += amount; }
void Clip(const ImRect& clip) { Min.x = ImMax(Min.x, clip.Min.x); Min.y = ImMax(Min.y, clip.Min.y); Max.x = ImMin(Max.x, clip.Max.x); Max.y = ImMin(Max.y, clip.Max.y); }
ImVec2 GetClosestPoint(ImVec2 p, bool on_edge) const
{
if (!on_edge && Contains(p))
return p;
if (p.x > Max.x) p.x = Max.x;
else if (p.x < Min.x) p.x = Min.x;
if (p.y > Max.y) p.y = Max.y;
else if (p.y < Min.y) p.y = Min.y;
return p;
}
};
typedef ImRect ImGuiAabb; // FIXME-OBSOLETE
@ -2589,6 +2600,14 @@ ImVec2 ImGui::GetItemRectSize()
return window->DC.LastItemRect.GetSize();
}
ImVec2 ImGui::CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge, float outward)
{
ImGuiWindow* window = GetCurrentWindow();
ImRect rect = window->DC.LastItemRect;
rect.Expand(outward);
return rect.GetClosestPoint(pos, on_edge);
}
// Tooltip is stored and turned into a BeginTooltip()/EndTooltip() sequence at the end of the frame. Each call override previous value.
void ImGui::SetTooltipV(const char* fmt, va_list args)
{
@ -3232,7 +3251,7 @@ static void Scrollbar(ImGuiWindow* window)
// Render background
ImRect bb(window->Rect().Max.x - style.ScrollbarWidth, window->Pos.y + window->TitleBarHeight()+1, window->Rect().Max.x, window->Rect().Max.y-1);
window->DrawList->AddRectFilled(bb.Min, bb.Max, window->Color(ImGuiCol_ScrollbarBg));
bb.Expand(ImVec2(-3,-3));
bb.Expand(-3.0f);
const float scrollbar_height = bb.GetHeight();
// The grabable box size generally represent the amount visible (vs the total scrollable amount)

1
imgui.h
View File

@ -374,6 +374,7 @@ namespace ImGui
IMGUI_API float GetTime();
IMGUI_API int GetFrameCount();
IMGUI_API const char* GetStyleColName(ImGuiCol idx);
IMGUI_API ImVec2 CalcItemRectClosestPoint(const ImVec2& pos, bool on_edge = false, float outward = +0.0f); // utility to find the closest point the last item bounding rectangle edge. useful to visually link items.
IMGUI_API ImVec2 CalcTextSize(const char* text, const char* text_end = NULL, bool hide_text_after_double_hash = false, float wrap_width = -1.0f);
IMGUI_API void CalcListClipping(int items_count, float items_height, int* out_items_display_start, int* out_items_display_end); // helper to manually clip large list of items. see comments in implementation.