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imgui_node_editor.cpp
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//------------------------------------------------------------------------------
// LICENSE
// This software is dual-licensed to the public domain and under the following
// license: you are granted a perpetual, irrevocable license to copy, modify,
// publish, and distribute this file as you see fit.
//
// CREDITS
// Written by Michal Cichon
//------------------------------------------------------------------------------
# include "imgui_node_editor_internal.h"
# include <cstdio> // snprintf
# include <string>
# include <fstream>
# include <bitset>
# include <climits>
# include <algorithm>
# include <sstream>
# include <streambuf>
# include <type_traits>
// https://stackoverflow.com/a/8597498
# define DECLARE_HAS_NESTED(Name, Member) \
\
template<class T> \
struct has_nested_ ## Name \
{ \
typedef char yes; \
typedef yes(&no)[2]; \
\
template<class U> static yes test(decltype(U::Member)*); \
template<class U> static no test(...); \
\
static bool const value = sizeof(test<T>(0)) == sizeof(yes); \
};
namespace ax {
namespace NodeEditor {
namespace Detail {
# define DECLARE_KEY_TESTER(Key) \
DECLARE_HAS_NESTED(Key, Key) \
struct KeyTester_ ## Key \
{ \
template <typename T> \
static int Get(typename std::enable_if<has_nested_ ## Key<ImGuiKey_>::value, T>::type*) \
{ \
return ImGui::GetKeyIndex(T::Key); \
} \
\
template <typename T> \
static int Get(typename std::enable_if<!has_nested_ ## Key<ImGuiKey_>::value, T>::type*) \
{ \
return -1; \
} \
}
DECLARE_KEY_TESTER(ImGuiKey_F);
DECLARE_KEY_TESTER(ImGuiKey_D);
static inline int GetKeyIndexForF()
{
return KeyTester_ImGuiKey_F::Get<ImGuiKey_>(nullptr);
}
static inline int GetKeyIndexForD()
{
return KeyTester_ImGuiKey_D::Get<ImGuiKey_>(nullptr);
}
} // namespace Detail
} // namespace NodeEditor
} // namespace ax
//------------------------------------------------------------------------------
namespace ed = ax::NodeEditor::Detail;
//------------------------------------------------------------------------------
static const int c_BackgroundChannelCount = 1;
static const int c_LinkChannelCount = 4;
static const int c_UserLayersCount = 5;
static const int c_UserLayerChannelStart = 0;
static const int c_BackgroundChannelStart = c_UserLayerChannelStart + c_UserLayersCount;
static const int c_LinkStartChannel = c_BackgroundChannelStart + c_BackgroundChannelCount;
static const int c_NodeStartChannel = c_LinkStartChannel + c_LinkChannelCount;
static const int c_BackgroundChannel_SelectionRect = c_BackgroundChannelStart + 0;
static const int c_UserChannel_Content = c_UserLayerChannelStart + 1;
static const int c_UserChannel_Grid = c_UserLayerChannelStart + 2;
static const int c_UserChannel_HintsBackground = c_UserLayerChannelStart + 3;
static const int c_UserChannel_Hints = c_UserLayerChannelStart + 4;
static const int c_LinkChannel_Selection = c_LinkStartChannel + 0;
static const int c_LinkChannel_Links = c_LinkStartChannel + 1;
static const int c_LinkChannel_Flow = c_LinkStartChannel + 2;
static const int c_LinkChannel_NewLink = c_LinkStartChannel + 3;
static const int c_ChannelsPerNode = 5;
static const int c_NodeBaseChannel = 0;
static const int c_NodeBackgroundChannel = 1;
static const int c_NodeUserBackgroundChannel = 2;
static const int c_NodePinChannel = 3;
static const int c_NodeContentChannel = 4;
static const float c_GroupSelectThickness = 6.0f; // canvas pixels
static const float c_LinkSelectThickness = 5.0f; // canvas pixels
static const float c_NavigationZoomMargin = 0.1f; // percentage of visible bounds
static const float c_MouseZoomDuration = 0.15f; // seconds
static const float c_SelectionFadeOutDuration = 0.15f; // seconds
static const auto c_ScrollButtonIndex = 1;
//------------------------------------------------------------------------------
# if defined(_DEBUG) && defined(_WIN32)
extern "C" __declspec(dllimport) void __stdcall OutputDebugStringA(const char* string);
static void LogV(const char* fmt, va_list args)
{
const int buffer_size = 1024;
static char buffer[1024];
vsnprintf(buffer, buffer_size - 1, fmt, args);
buffer[buffer_size - 1] = 0;
ImGui::LogText("\nNode Editor: %s", buffer);
OutputDebugStringA("NodeEditor: ");
OutputDebugStringA(buffer);
OutputDebugStringA("\n");
}
# endif
void ed::Log(const char* fmt, ...)
{
# if defined(_DEBUG) && defined(_WIN32)
va_list args;
va_start(args, fmt);
LogV(fmt, args);
va_end(args);
# endif
}
//------------------------------------------------------------------------------
static bool IsGroup(const ed::Node* node)
{
if (node && node->m_Type == ed::NodeType::Group)
return true;
else
return false;
}
//------------------------------------------------------------------------------
static void ImDrawListSplitter_Grow(ImDrawList* draw_list, ImDrawListSplitter* splitter, int channels_count)
{
IM_ASSERT(splitter != nullptr);
IM_ASSERT(splitter->_Count <= channels_count);
if (splitter->_Count == 1)
{
splitter->Split(draw_list, channels_count);
return;
}
int old_channels_count = splitter->_Channels.Size;
if (old_channels_count < channels_count)
splitter->_Channels.resize(channels_count);
int old_used_channels_count = splitter->_Count;
splitter->_Count = channels_count;
for (int i = old_used_channels_count; i < channels_count; i++)
{
if (i >= old_channels_count)
{
IM_PLACEMENT_NEW(&splitter->_Channels[i]) ImDrawChannel();
}
else
{
splitter->_Channels[i]._CmdBuffer.resize(0);
splitter->_Channels[i]._IdxBuffer.resize(0);
}
if (splitter->_Channels[i]._CmdBuffer.Size == 0)
{
ImDrawCmd draw_cmd;
draw_cmd.ClipRect = draw_list->_ClipRectStack.back();
draw_cmd.TextureId = draw_list->_TextureIdStack.back();
splitter->_Channels[i]._CmdBuffer.push_back(draw_cmd);
}
}
}
static void ImDrawList_ChannelsGrow(ImDrawList* draw_list, int channels_count)
{
ImDrawListSplitter_Grow(draw_list, &draw_list->_Splitter, channels_count);
}
static void ImDrawListSplitter_SwapChannels(ImDrawListSplitter* splitter, int left, int right)
{
IM_ASSERT(left < splitter->_Count && right < splitter->_Count);
if (left == right)
return;
auto currentChannel = splitter->_Current;
auto* leftCmdBuffer = &splitter->_Channels[left]._CmdBuffer;
auto* leftIdxBuffer = &splitter->_Channels[left]._IdxBuffer;
auto* rightCmdBuffer = &splitter->_Channels[right]._CmdBuffer;
auto* rightIdxBuffer = &splitter->_Channels[right]._IdxBuffer;
leftCmdBuffer->swap(*rightCmdBuffer);
leftIdxBuffer->swap(*rightIdxBuffer);
if (currentChannel == left)
splitter->_Current = right;
else if (currentChannel == right)
splitter->_Current = left;
}
static void ImDrawList_SwapChannels(ImDrawList* drawList, int left, int right)
{
ImDrawListSplitter_SwapChannels(&drawList->_Splitter, left, right);
}
//static void ImDrawList_TransformChannel_Inner(ImVector<ImDrawVert>& vtxBuffer, const ImVector<ImDrawIdx>& idxBuffer, const ImVector<ImDrawCmd>& cmdBuffer, const ImVec2& preOffset, const ImVec2& scale, const ImVec2& postOffset)
//{
// auto idxRead = idxBuffer.Data;
//
// int indexOffset = 0;
// for (auto& cmd : cmdBuffer)
// {
// auto idxCount = cmd.ElemCount;
//
// if (idxCount == 0) continue;
//
// auto minIndex = idxRead[indexOffset];
// auto maxIndex = idxRead[indexOffset];
//
// for (auto i = 1u; i < idxCount; ++i)
// {
// auto idx = idxRead[indexOffset + i];
// minIndex = std::min(minIndex, idx);
// maxIndex = ImMax(maxIndex, idx);
// }
//
// for (auto vtx = vtxBuffer.Data + minIndex, vtxEnd = vtxBuffer.Data + maxIndex + 1; vtx < vtxEnd; ++vtx)
// {
// vtx->pos.x = (vtx->pos.x + preOffset.x) * scale.x + postOffset.x;
// vtx->pos.y = (vtx->pos.y + preOffset.y) * scale.y + postOffset.y;
// }
//
// indexOffset += idxCount;
// }
//}
//static void ImDrawList_TransformChannels(ImDrawList* drawList, int begin, int end, const ImVec2& preOffset, const ImVec2& scale, const ImVec2& postOffset)
//{
// int lastCurrentChannel = drawList->_ChannelsCurrent;
// if (lastCurrentChannel != 0)
// drawList->ChannelsSetCurrent(0);
//
// auto& vtxBuffer = drawList->VtxBuffer;
//
// if (begin == 0 && begin != end)
// {
// ImDrawList_TransformChannel_Inner(vtxBuffer, drawList->IdxBuffer, drawList->CmdBuffer, preOffset, scale, postOffset);
// ++begin;
// }
//
// for (int channelIndex = begin; channelIndex < end; ++channelIndex)
// {
// auto& channel = drawList->_Channels[channelIndex];
// ImDrawList_TransformChannel_Inner(vtxBuffer, channel.IdxBuffer, channel.CmdBuffer, preOffset, scale, postOffset);
// }
//
// if (lastCurrentChannel != 0)
// drawList->ChannelsSetCurrent(lastCurrentChannel);
//}
//static void ImDrawList_ClampClipRects_Inner(ImVector<ImDrawCmd>& cmdBuffer, const ImVec4& clipRect, const ImVec2& offset)
//{
// for (auto& cmd : cmdBuffer)
// {
// cmd.ClipRect.x = ImMax(cmd.ClipRect.x + offset.x, clipRect.x);
// cmd.ClipRect.y = ImMax(cmd.ClipRect.y + offset.y, clipRect.y);
// cmd.ClipRect.z = std::min(cmd.ClipRect.z + offset.x, clipRect.z);
// cmd.ClipRect.w = std::min(cmd.ClipRect.w + offset.y, clipRect.w);
// }
//}
//static void ImDrawList_TranslateAndClampClipRects(ImDrawList* drawList, int begin, int end, const ImVec2& offset)
//{
// int lastCurrentChannel = drawList->_ChannelsCurrent;
// if (lastCurrentChannel != 0)
// drawList->ChannelsSetCurrent(0);
//
// auto clipRect = drawList->_ClipRectStack.back();
//
// if (begin == 0 && begin != end)
// {
// ImDrawList_ClampClipRects_Inner(drawList->CmdBuffer, clipRect, offset);
// ++begin;
// }
//
// for (int channelIndex = begin; channelIndex < end; ++channelIndex)
// {
// auto& channel = drawList->_Channels[channelIndex];
// ImDrawList_ClampClipRects_Inner(channel.CmdBuffer, clipRect, offset);
// }
//
// if (lastCurrentChannel != 0)
// drawList->ChannelsSetCurrent(lastCurrentChannel);
//}
static void ImDrawList_PathBezierOffset(ImDrawList* drawList, float offset, const ImVec2& p0, const ImVec2& p1, const ImVec2& p2, const ImVec2& p3)
{
using namespace ed;
auto acceptPoint = [drawList, offset](const ImCubicBezierSubdivideSample& r)
{
drawList->PathLineTo(r.Point + ImNormalized(ImVec2(-r.Tangent.y, r.Tangent.x)) * offset);
};
ImCubicBezierSubdivide(acceptPoint, p0, p1, p2, p3);
}
/*
static void ImDrawList_PolyFillScanFlood(ImDrawList *draw, std::vector<ImVec2>* poly, ImColor color, int gap = 1, float strokeWidth = 1.0f)
{
std::vector<ImVec2> scanHits;
ImVec2 min, max; // polygon min/max points
auto io = ImGui::GetIO();
float y;
bool isMinMaxDone = false;
unsigned int polysize = poly->size();
// find the orthagonal bounding box
// probably can put this as a predefined
if (!isMinMaxDone)
{
min.x = min.y = FLT_MAX;
max.x = max.y = FLT_MIN;
for (auto p : *poly)
{
if (p.x < min.x) min.x = p.x;
if (p.y < min.y) min.y = p.y;
if (p.x > max.x) max.x = p.x;
if (p.y > max.y) max.y = p.y;
}
isMinMaxDone = true;
}
// Bounds check
if ((max.x < 0) || (min.x > io.DisplaySize.x) || (max.y < 0) || (min.y > io.DisplaySize.y)) return;
// Vertically clip
if (min.y < 0) min.y = 0;
if (max.y > io.DisplaySize.y) max.y = io.DisplaySize.y;
// so we know we start on the outside of the object we step out by 1.
min.x -= 1;
max.x += 1;
// Initialise our starting conditions
y = min.y;
// Go through each scan line iteratively, jumping by 'gap' pixels each time
while (y < max.y)
{
scanHits.clear();
{
int jump = 1;
ImVec2 fp = poly->at(0);
for (size_t i = 0; i < polysize - 1; i++)
{
ImVec2 pa = poly->at(i);
ImVec2 pb = poly->at(i + 1);
// jump double/dud points
if (pa.x == pb.x && pa.y == pb.y) continue;
// if we encounter our hull/poly start point, then we've now created the
// closed
// hull, jump the next segment and reset the first-point
if ((!jump) && (fp.x == pb.x) && (fp.y == pb.y))
{
if (i < polysize - 2)
{
fp = poly->at(i + 2);
jump = 1;
i++;
}
}
else
{
jump = 0;
}
// test to see if this segment makes the scan-cut.
if ((pa.y > pb.y && y < pa.y && y > pb.y) || (pa.y < pb.y && y > pa.y && y < pb.y))
{
ImVec2 intersect;
intersect.y = y;
if (pa.x == pb.x)
{
intersect.x = pa.x;
}
else
{
intersect.x = (pb.x - pa.x) / (pb.y - pa.y) * (y - pa.y) + pa.x;
}
scanHits.push_back(intersect);
}
}
// Sort the scan hits by X, so we have a proper left->right ordering
sort(scanHits.begin(), scanHits.end(), [](ImVec2 const &a, ImVec2 const &b) { return a.x < b.x; });
// generate the line segments.
{
int i = 0;
int l = scanHits.size() - 1; // we need pairs of points, this prevents segfault.
for (i = 0; i < l; i += 2)
{
draw->AddLine(scanHits[i], scanHits[i + 1], color, strokeWidth);
}
}
}
y += gap;
} // for each scan line
scanHits.clear();
}
*/
static void ImDrawList_AddBezierWithArrows(ImDrawList* drawList, const ImCubicBezierPoints& curve, float thickness,
float startArrowSize, float startArrowWidth, float endArrowSize, float endArrowWidth,
bool fill, ImU32 color, float strokeThickness)
{
using namespace ax;
if ((color >> 24) == 0)
return;
const auto half_thickness = thickness * 0.5f;
if (fill)
{
drawList->AddBezierCurve(curve.P0, curve.P1, curve.P2, curve.P3, color, thickness);
if (startArrowSize > 0.0f)
{
const auto start_dir = ImNormalized(ImCubicBezierTangent(curve.P0, curve.P1, curve.P2, curve.P3, 0.0f));
const auto start_n = ImVec2(-start_dir.y, start_dir.x);
const auto half_width = startArrowWidth * 0.5f;
const auto tip = curve.P0 - start_dir * startArrowSize;
drawList->PathLineTo(curve.P0 - start_n * ImMax(half_width, half_thickness));
drawList->PathLineTo(curve.P0 + start_n * ImMax(half_width, half_thickness));
drawList->PathLineTo(tip);
drawList->PathFillConvex(color);
}
if (endArrowSize > 0.0f)
{
const auto end_dir = ImNormalized(ImCubicBezierTangent(curve.P0, curve.P1, curve.P2, curve.P3, 1.0f));
const auto end_n = ImVec2( -end_dir.y, end_dir.x);
const auto half_width = endArrowWidth * 0.5f;
const auto tip = curve.P3 + end_dir * endArrowSize;
drawList->PathLineTo(curve.P3 + end_n * ImMax(half_width, half_thickness));
drawList->PathLineTo(curve.P3 - end_n * ImMax(half_width, half_thickness));
drawList->PathLineTo(tip);
drawList->PathFillConvex(color);
}
}
else
{
if (startArrowSize > 0.0f)
{
const auto start_dir = ImNormalized(ImCubicBezierTangent(curve.P0, curve.P1, curve.P2, curve.P3, 0.0f));
const auto start_n = ImVec2(-start_dir.y, start_dir.x);
const auto half_width = startArrowWidth * 0.5f;
const auto tip = curve.P0 - start_dir * startArrowSize;
if (half_width > half_thickness)
drawList->PathLineTo(curve.P0 - start_n * half_width);
drawList->PathLineTo(tip);
if (half_width > half_thickness)
drawList->PathLineTo(curve.P0 + start_n * half_width);
}
ImDrawList_PathBezierOffset(drawList, half_thickness, curve.P0, curve.P1, curve.P2, curve.P3);
if (endArrowSize > 0.0f)
{
const auto end_dir = ImNormalized(ImCubicBezierTangent(curve.P0, curve.P1, curve.P2, curve.P3, 1.0f));
const auto end_n = ImVec2( -end_dir.y, end_dir.x);
const auto half_width = endArrowWidth * 0.5f;
const auto tip = curve.P3 + end_dir * endArrowSize;
if (half_width > half_thickness)
drawList->PathLineTo(curve.P3 + end_n * half_width);
drawList->PathLineTo(tip);
if (half_width > half_thickness)
drawList->PathLineTo(curve.P3 - end_n * half_width);
}
ImDrawList_PathBezierOffset(drawList, half_thickness, curve.P3, curve.P2, curve.P1, curve.P0);
drawList->PathStroke(color, true, strokeThickness);
}
}
//------------------------------------------------------------------------------
//
// Pin
//
//------------------------------------------------------------------------------
void ed::Pin::Draw(ImDrawList* drawList, DrawFlags flags)
{
if (flags & Hovered)
{
drawList->ChannelsSetCurrent(m_Node->m_Channel + c_NodePinChannel);
drawList->AddRectFilled(m_Bounds.Min, m_Bounds.Max,
m_Color, m_Rounding, m_Corners);
if (m_BorderWidth > 0.0f)
{
FringeScaleScope fringe(1.0f);
drawList->AddRect(m_Bounds.Min, m_Bounds.Max,
m_BorderColor, m_Rounding, m_Corners, m_BorderWidth);
}
if (!Editor->IsSelected(m_Node))
m_Node->Draw(drawList, flags);
}
}
ImVec2 ed::Pin::GetClosestPoint(const ImVec2& p) const
{
return ImRect_ClosestPoint(m_Pivot, p, true, m_Radius + m_ArrowSize);
}
ImLine ed::Pin::GetClosestLine(const Pin* pin) const
{
return ImRect_ClosestLine(m_Pivot, pin->m_Pivot, m_Radius + m_ArrowSize, pin->m_Radius + pin->m_ArrowSize);
}
//------------------------------------------------------------------------------
//
// Node
//
//------------------------------------------------------------------------------
bool ed::Node::AcceptDrag()
{
m_DragStart = m_Bounds.Min;
return true;
}
void ed::Node::UpdateDrag(const ImVec2& offset)
{
auto size = m_Bounds.GetSize();
m_Bounds.Min = ImFloor(m_DragStart + offset);
m_Bounds.Max = m_Bounds.Min + size;
}
bool ed::Node::EndDrag()
{
return m_Bounds.Min != m_DragStart;
}
void ed::Node::Draw(ImDrawList* drawList, DrawFlags flags)
{
if (flags == Detail::Object::None)
{
drawList->ChannelsSetCurrent(m_Channel + c_NodeBackgroundChannel);
drawList->AddRectFilled(
m_Bounds.Min,
m_Bounds.Max,
m_Color, m_Rounding);
if (IsGroup(this))
{
drawList->AddRectFilled(
m_GroupBounds.Min,
m_GroupBounds.Max,
m_GroupColor, m_GroupRounding);
if (m_GroupBorderWidth > 0.0f)
{
FringeScaleScope fringe(1.0f);
drawList->AddRect(
m_GroupBounds.Min,
m_GroupBounds.Max,
m_GroupBorderColor, m_GroupRounding, 15, m_GroupBorderWidth);
}
}
# if 0
// #debug: highlight group regions
auto drawRect = [drawList](const ImRect& rect, ImU32 color)
{
if (ImRect_IsEmpty(rect)) return;
drawList->AddRectFilled(rect.Min, rect.Max, color);
};
drawRect(GetRegionBounds(NodeRegion::Top), IM_COL32(255, 0, 0, 64));
drawRect(GetRegionBounds(NodeRegion::Bottom), IM_COL32(255, 0, 0, 64));
drawRect(GetRegionBounds(NodeRegion::Left), IM_COL32(0, 255, 0, 64));
drawRect(GetRegionBounds(NodeRegion::Right), IM_COL32(0, 255, 0, 64));
drawRect(GetRegionBounds(NodeRegion::TopLeft), IM_COL32(255, 0, 255, 64));
drawRect(GetRegionBounds(NodeRegion::TopRight), IM_COL32(255, 0, 255, 64));
drawRect(GetRegionBounds(NodeRegion::BottomLeft), IM_COL32(255, 0, 255, 64));
drawRect(GetRegionBounds(NodeRegion::BottomRight), IM_COL32(255, 0, 255, 64));
drawRect(GetRegionBounds(NodeRegion::Center), IM_COL32(0, 0, 255, 64));
drawRect(GetRegionBounds(NodeRegion::Header), IM_COL32(0, 255, 255, 64));
# endif
DrawBorder(drawList, m_BorderColor, m_BorderWidth);
}
else if (flags & Selected)
{
const auto borderColor = Editor->GetColor(StyleColor_SelNodeBorder);
const auto& editorStyle = Editor->GetStyle();
drawList->ChannelsSetCurrent(m_Channel + c_NodeBaseChannel);
DrawBorder(drawList, borderColor, editorStyle.SelectedNodeBorderWidth);
}
else if (!IsGroup(this) && (flags & Hovered))
{
const auto borderColor = Editor->GetColor(StyleColor_HovNodeBorder);
const auto& editorStyle = Editor->GetStyle();
drawList->ChannelsSetCurrent(m_Channel + c_NodeBaseChannel);
DrawBorder(drawList, borderColor, editorStyle.HoveredNodeBorderWidth);
}
}
void ed::Node::DrawBorder(ImDrawList* drawList, ImU32 color, float thickness)
{
if (thickness > 0.0f)
{
drawList->AddRect(m_Bounds.Min, m_Bounds.Max,
color, m_Rounding, 15, thickness);
}
}
void ed::Node::GetGroupedNodes(std::vector<Node*>& result, bool append)
{
if (!append)
result.resize(0);
if (!IsGroup(this))
return;
const auto firstNodeIndex = result.size();
Editor->FindNodesInRect(m_GroupBounds, result, true, false);
for (auto index = firstNodeIndex; index < result.size(); ++index)
result[index]->GetGroupedNodes(result, true);
}
ImRect ed::Node::GetRegionBounds(NodeRegion region) const
{
if (m_Type == NodeType::Node)
{
if (region == NodeRegion::Header)
return m_Bounds;
}
else if (m_Type == NodeType::Group)
{
const float activeAreaMinimumSize = ImMax(ImMax(
Editor->GetView().InvScale * c_GroupSelectThickness,
m_GroupBorderWidth), c_GroupSelectThickness);
const float minimumSize = activeAreaMinimumSize * 5;
auto bounds = m_Bounds;
if (bounds.GetWidth() < minimumSize)
bounds.Expand(ImVec2(minimumSize - bounds.GetWidth(), 0.0f));
if (bounds.GetHeight() < minimumSize)
bounds.Expand(ImVec2(0.0f, minimumSize - bounds.GetHeight()));
if (region == NodeRegion::Top)
{
bounds.Max.y = bounds.Min.y + activeAreaMinimumSize;
bounds.Min.x += activeAreaMinimumSize;
bounds.Max.x -= activeAreaMinimumSize;
return bounds;
}
else if (region == NodeRegion::Bottom)
{
bounds.Min.y = bounds.Max.y - activeAreaMinimumSize;
bounds.Min.x += activeAreaMinimumSize;
bounds.Max.x -= activeAreaMinimumSize;
return bounds;
}
else if (region == NodeRegion::Left)
{
bounds.Max.x = bounds.Min.x + activeAreaMinimumSize;
bounds.Min.y += activeAreaMinimumSize;
bounds.Max.y -= activeAreaMinimumSize;
return bounds;
}
else if (region == NodeRegion::Right)
{
bounds.Min.x = bounds.Max.x - activeAreaMinimumSize;
bounds.Min.y += activeAreaMinimumSize;
bounds.Max.y -= activeAreaMinimumSize;
return bounds;
}
else if (region == NodeRegion::TopLeft)
{
bounds.Max.x = bounds.Min.x + activeAreaMinimumSize * 2;
bounds.Max.y = bounds.Min.y + activeAreaMinimumSize * 2;
return bounds;
}
else if (region == NodeRegion::TopRight)
{
bounds.Min.x = bounds.Max.x - activeAreaMinimumSize * 2;
bounds.Max.y = bounds.Min.y + activeAreaMinimumSize * 2;
return bounds;
}
else if (region == NodeRegion::BottomRight)
{
bounds.Min.x = bounds.Max.x - activeAreaMinimumSize * 2;
bounds.Min.y = bounds.Max.y - activeAreaMinimumSize * 2;
return bounds;
}
else if (region == NodeRegion::BottomLeft)
{
bounds.Max.x = bounds.Min.x + activeAreaMinimumSize * 2;
bounds.Min.y = bounds.Max.y - activeAreaMinimumSize * 2;
return bounds;
}
else if (region == NodeRegion::Header)
{
bounds.Min.x += activeAreaMinimumSize;
bounds.Max.x -= activeAreaMinimumSize;
bounds.Min.y += activeAreaMinimumSize;
bounds.Max.y = ImMax(bounds.Min.y + activeAreaMinimumSize, m_GroupBounds.Min.y);
return bounds;
}
else if (region == NodeRegion::Center)
{
bounds.Max.x -= activeAreaMinimumSize;
bounds.Min.y = ImMax(bounds.Min.y + activeAreaMinimumSize, m_GroupBounds.Min.y);
bounds.Min.x += activeAreaMinimumSize;
bounds.Max.y -= activeAreaMinimumSize;
return bounds;
}
}
return ImRect();
}
ed::NodeRegion ed::Node::GetRegion(const ImVec2& point) const
{
if (m_Type == NodeType::Node)
{
if (m_Bounds.Contains(point))
return NodeRegion::Header;
else
return NodeRegion::None;
}
else if (m_Type == NodeType::Group)
{
static const NodeRegion c_Regions[] =
{
// Corners first, they may overlap other regions.
NodeRegion::TopLeft,
NodeRegion::TopRight,
NodeRegion::BottomLeft,
NodeRegion::BottomRight,
NodeRegion::Header,
NodeRegion::Top,
NodeRegion::Bottom,
NodeRegion::Left,
NodeRegion::Right,
NodeRegion::Center
};
for (auto region : c_Regions)
{
auto bounds = GetRegionBounds(region);
if (bounds.Contains(point))
return region;
}
}
return NodeRegion::None;
}
//------------------------------------------------------------------------------
//
// Link
//
//------------------------------------------------------------------------------
void ed::Link::Draw(ImDrawList* drawList, DrawFlags flags)
{
if (flags == None)
{
drawList->ChannelsSetCurrent(c_LinkChannel_Links);
Draw(drawList, m_Color, 0.0f);
}
else if (flags & Selected)
{
const auto borderColor = Editor->GetColor(StyleColor_SelLinkBorder);
drawList->ChannelsSetCurrent(c_LinkChannel_Selection);
Draw(drawList, borderColor, 4.5f);
}
else if (flags & Hovered)
{
const auto borderColor = Editor->GetColor(StyleColor_HovLinkBorder);
drawList->ChannelsSetCurrent(c_LinkChannel_Selection);
Draw(drawList, borderColor, 2.0f);
}
}
void ed::Link::Draw(ImDrawList* drawList, ImU32 color, float extraThickness) const
{
if (!m_IsLive)
return;
const auto curve = GetCurve();
ImDrawList_AddBezierWithArrows(drawList, curve, m_Thickness + extraThickness,
m_StartPin && m_StartPin->m_ArrowSize > 0.0f ? m_StartPin->m_ArrowSize + extraThickness : 0.0f,
m_StartPin && m_StartPin->m_ArrowWidth > 0.0f ? m_StartPin->m_ArrowWidth + extraThickness : 0.0f,
m_EndPin && m_EndPin->m_ArrowSize > 0.0f ? m_EndPin->m_ArrowSize + extraThickness : 0.0f,
m_EndPin && m_EndPin->m_ArrowWidth > 0.0f ? m_EndPin->m_ArrowWidth + extraThickness : 0.0f,
true, color, 1.0f);
}
void ed::Link::UpdateEndpoints()
{
const auto line = m_StartPin->GetClosestLine(m_EndPin);
m_Start = line.A;
m_End = line.B;
}
ImCubicBezierPoints ed::Link::GetCurve() const
{
auto easeLinkStrength = [](const ImVec2& a, const ImVec2& b, float strength)
{
const auto distanceX = b.x - a.x;
const auto distanceY = b.y - a.y;
const auto distance = ImSqrt(distanceX * distanceX + distanceY * distanceY);
const auto halfDistance = distance * 0.5f;
if (halfDistance < strength)
strength = strength * ImSin(IM_PI * 0.5f * halfDistance / strength);
return strength;
};
const auto startStrength = easeLinkStrength(m_Start, m_End, m_StartPin->m_Strength);
const auto endStrength = easeLinkStrength(m_Start, m_End, m_EndPin->m_Strength);
const auto cp0 = m_Start + m_StartPin->m_Dir * startStrength;
const auto cp1 = m_End + m_EndPin->m_Dir * endStrength;
ImCubicBezierPoints result;
result.P0 = m_Start;
result.P1 = cp0;
result.P2 = cp1;
result.P3 = m_End;
return result;
}
bool ed::Link::TestHit(const ImVec2& point, float extraThickness) const
{
if (!m_IsLive)
return false;
auto bounds = GetBounds();
if (extraThickness > 0.0f)
bounds.Expand(extraThickness);
if (!bounds.Contains(point))
return false;
const auto bezier = GetCurve();
const auto result = ImProjectOnCubicBezier(point, bezier.P0, bezier.P1, bezier.P2, bezier.P3, 50);
return result.Distance <= m_Thickness + extraThickness;
}
bool ed::Link::TestHit(const ImRect& rect, bool allowIntersect) const
{
if (!m_IsLive)
return false;
const auto bounds = GetBounds();
if (rect.Contains(bounds))
return true;
if (!allowIntersect || !rect.Overlaps(bounds))
return false;
const auto bezier = GetCurve();
const auto p0 = rect.GetTL();
const auto p1 = rect.GetTR();
const auto p2 = rect.GetBR();
const auto p3 = rect.GetBL();
if (ImCubicBezierLineIntersect(bezier.P0, bezier.P1, bezier.P2, bezier.P3, p0, p1).Count > 0)
return true;
if (ImCubicBezierLineIntersect(bezier.P0, bezier.P1, bezier.P2, bezier.P3, p1, p2).Count > 0)
return true;
if (ImCubicBezierLineIntersect(bezier.P0, bezier.P1, bezier.P2, bezier.P3, p2, p3).Count > 0)
return true;
if (ImCubicBezierLineIntersect(bezier.P0, bezier.P1, bezier.P2, bezier.P3, p3, p0).Count > 0)
return true;
return false;
}
ImRect ed::Link::GetBounds() const
{
if (m_IsLive)
{
const auto curve = GetCurve();
auto bounds = ImCubicBezierBoundingRect(curve.P0, curve.P1, curve.P2, curve.P3);
if (bounds.GetWidth() == 0.0f)
{
bounds.Min.x -= 0.5f;
bounds.Max.x += 0.5f;
}
if (bounds.GetHeight() == 0.0f)
{
bounds.Min.y -= 0.5f;
bounds.Max.y += 0.5f;
}
if (m_StartPin->m_ArrowSize)
{
const auto start_dir = ImNormalized(ImCubicBezierTangent(curve.P0, curve.P1, curve.P2, curve.P3, 0.0f));
const auto p0 = curve.P0;
const auto p1 = curve.P0 - start_dir * m_StartPin->m_ArrowSize;
const auto min = ImMin(p0, p1);
const auto max = ImMax(p0, p1);
auto arrowBounds = ImRect(min, ImMax(max, min + ImVec2(1, 1)));
bounds.Add(arrowBounds);
}
if (m_EndPin->m_ArrowSize)
{
const auto end_dir = ImNormalized(ImCubicBezierTangent(curve.P0, curve.P1, curve.P2, curve.P3, 1.0f));
const auto p0 = curve.P3;
const auto p1 = curve.P3 + end_dir * m_EndPin->m_ArrowSize;
const auto min = ImMin(p0, p1);
const auto max = ImMax(p0, p1);
auto arrowBounds = ImRect(min, ImMax(max, min + ImVec2(1, 1)));
bounds.Add(arrowBounds);
}
return bounds;
}
else
return ImRect();
}
//------------------------------------------------------------------------------
//
// Editor Context
//
//------------------------------------------------------------------------------