ImGui::DragCanvas Struct Reference

#include <ImGuiLayer.h>

Public Member Functions
	DragCanvas (const void *id, SkPoint tl={ 0.0f, 0.0f }, SkPoint br={ 1.0f, 1.0f }, float aspect=-1.0f)
	~DragCanvas ()
void	fillColor (ImU32 color)
void	dragPoint (SkPoint *p, bool tooltip=false, ImU32 color=0xFFFFFFFF)

Public Attributes
ImDrawList *	fDrawList
ImVec2	fPos
ImVec2	fSize
skia_private::STArray< 4, ImVec2, true >	fScreenPoints
SkMatrix	fLocalToScreen
SkMatrix	fScreenToLocal
int	fID
bool	fDragging

Detailed Description

Definition at line 38 of file ImGuiLayer.h.

Constructor & Destructor Documentation

DragCanvas()

ImGui::DragCanvas::DragCanvas ( const void *  id, SkPoint  tl = { 0.0f, 0.0f }, SkPoint  br = { 1.0f, 1.0f }, float  aspect = -1.0f  )

inline

Definition at line 39 of file ImGuiLayer.h.

                                            { 0.0f, 0.0f }, SkPoint br = { 1.0f, 1.0f },
               float aspect = -1.0f)
            : fID(0), fDragging(false) {
        ImGui::PushID(id);
        fDrawList = ImGui::GetWindowDrawList();
 
        // Logical size
        SkScalar w = SkTAbs(br.fX - tl.fX),
                 h = SkTAbs(br.fY - tl.fY);
 
        // Determine aspect ratio automatically by default
        if (aspect < 0) {
            aspect = h / w;
        }
 
        float availWidth = std::max(ImGui::GetContentRegionAvailWidth(), 1.0f);
        fPos = ImGui::GetCursorScreenPos();
        fSize = ImVec2(availWidth, availWidth * aspect);
 
        SkPoint local[4] = {
            { tl.fX, tl.fY },
            { br.fX, tl.fY },
            { tl.fX, br.fY },
            { br.fX, br.fY },
        };
        SkPoint screen[4] = {
            { fPos.x          , fPos.y           },
            { fPos.x + fSize.x, fPos.y           },
            { fPos.x          , fPos.y + fSize.y },
            { fPos.x + fSize.x, fPos.y + fSize.y },
        };
        fLocalToScreen.setPolyToPoly(local, screen, 4);
        fScreenToLocal.setPolyToPoly(screen, local, 4);
    }

~DragCanvas()

ImGui::DragCanvas::~DragCanvas ( )

inline

Definition at line 74 of file ImGuiLayer.h.

                  {
        ImGui::SetCursorScreenPos(ImVec2(fPos.x, fPos.y + fSize.y));
        ImGui::Spacing();
        ImGui::PopID();
    }

Member Function Documentation

dragPoint()

void ImGui::DragCanvas::dragPoint ( SkPoint *  p, bool  tooltip = false, ImU32  color = 0xFFFFFFFF  )

inline

Definition at line 84 of file ImGuiLayer.h.

                                                                               {
        // Transform points from logical coordinates to screen coordinates
        SkPoint center = fLocalToScreen.mapXY(p->fX, p->fY);
 
        // Invisible 10x10 button
        ImGui::PushID(fID++);
        ImGui::SetCursorScreenPos(ImVec2(center.fX - 5, center.fY - 5));
        ImGui::InvisibleButton("", ImVec2(10, 10));
 
        if (ImGui::IsItemActive() && ImGui::IsMouseDragging(0)) {
            // Update screen position to track mouse, clamped to our area
            ImGuiIO& io = ImGui::GetIO();
            center.set(SkTPin(io.MousePos.x, fPos.x, fPos.x + fSize.x),
                       SkTPin(io.MousePos.y, fPos.y, fPos.y + fSize.y));
 
            // Update local coordinates for the caller
            *p = fScreenToLocal.mapXY(center.fX, center.fY);
            fDragging = true;
        }
 
        if (tooltip && ImGui::IsItemHovered()) {
            ImGui::SetTooltip("x: %.3f\ny: %.3f", p->fX, p->fY);
        }
 
        ImGui::PopID();
 
        fScreenPoints.push_back(ImVec2(center.fX, center.fY));
        fDrawList->AddCircle(fScreenPoints.back(), 5.0f, color);
    }

fillColor()

void ImGui::DragCanvas::fillColor ( ImU32  color )

inline

Definition at line 80 of file ImGuiLayer.h.

                                {
        fDrawList->AddRectFilled(fPos, ImVec2(fPos.x + fSize.x, fPos.y + fSize.y), color);
    }

Member Data Documentation

fDragging

bool ImGui::DragCanvas::fDragging

Definition at line 128 of file ImGuiLayer.h.

fDrawList

ImDrawList* ImGui::DragCanvas::fDrawList

Definition at line 114 of file ImGuiLayer.h.

fID

int ImGui::DragCanvas::fID

Definition at line 127 of file ImGuiLayer.h.

fLocalToScreen

SkMatrix ImGui::DragCanvas::fLocalToScreen

Definition at line 124 of file ImGuiLayer.h.

fPos

ImVec2 ImGui::DragCanvas::fPos

Definition at line 117 of file ImGuiLayer.h.

fScreenPoints

skia_private::STArray<4, ImVec2, true> ImGui::DragCanvas::fScreenPoints

Definition at line 121 of file ImGuiLayer.h.

fScreenToLocal

SkMatrix ImGui::DragCanvas::fScreenToLocal

Definition at line 125 of file ImGuiLayer.h.

fSize

ImVec2 ImGui::DragCanvas::fSize

Definition at line 118 of file ImGuiLayer.h.

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The documentation for this struct was generated from the following file:

• third_party/skia/tools/viewer/ImGuiLayer.h