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AnimTestbed/3rdparty/imgui-node-editor/examples/canvas-example/canvas-example.cpp

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# define IMGUI_DEFINE_MATH_OPERATORS
# include <imgui.h>
# include <imgui_internal.h>
# include <imgui_canvas.h>
# include <application.h>
static void DrawScale(const ImVec2& from, const ImVec2& to, float majorUnit, float minorUnit, float labelAlignment, float sign = 1.0f)
{
auto drawList = ImGui::GetWindowDrawList();
auto direction = (to - from) * ImInvLength(to - from, 0.0f);
auto normal = ImVec2(-direction.y, direction.x);
auto distance = sqrtf(ImLengthSqr(to - from));
if (ImDot(direction, direction) < FLT_EPSILON)
return;
auto minorSize = 5.0f;
auto majorSize = 10.0f;
auto labelDistance = 8.0f;
drawList->AddLine(from, to, IM_COL32(255, 255, 255, 255));
auto p = from;
for (auto d = 0.0f; d <= distance; d += minorUnit, p += direction * minorUnit)
drawList->AddLine(p - normal * minorSize, p + normal * minorSize, IM_COL32(255, 255, 255, 255));
for (auto d = 0.0f; d <= distance + majorUnit; d += majorUnit)
{
p = from + direction * d;
drawList->AddLine(p - normal * majorSize, p + normal * majorSize, IM_COL32(255, 255, 255, 255));
if (d == 0.0f)
continue;
char label[16];
snprintf(label, 15, "%g", d * sign);
auto labelSize = ImGui::CalcTextSize(label);
auto labelPosition = p + ImVec2(fabsf(normal.x), fabsf(normal.y)) * labelDistance;
auto labelAlignedSize = ImDot(labelSize, direction);
labelPosition += direction * (-labelAlignedSize + labelAlignment * labelAlignedSize * 2.0f);
labelPosition = ImFloor(labelPosition + ImVec2(0.5f, 0.5f));
drawList->AddText(labelPosition, IM_COL32(255, 255, 255, 255), label);
}
}
static bool Splitter(bool split_vertically, float thickness, float* size1, float* size2, float min_size1, float min_size2, float splitter_long_axis_size = -1.0f)
{
using namespace ImGui;
ImGuiContext& g = *GImGui;
ImGuiWindow* window = g.CurrentWindow;
ImGuiID id = window->GetID("##Splitter");
ImRect bb;
bb.Min = window->DC.CursorPos + (split_vertically ? ImVec2(*size1, 0.0f) : ImVec2(0.0f, *size1));
bb.Max = bb.Min + CalcItemSize(split_vertically ? ImVec2(thickness, splitter_long_axis_size) : ImVec2(splitter_long_axis_size, thickness), 0.0f, 0.0f);
return SplitterBehavior(bb, id, split_vertically ? ImGuiAxis_X : ImGuiAxis_Y, size1, size2, min_size1, min_size2, 0.0f);
}
struct Example:
public Application
{
using Application::Application;
void OnFrame(float deltaTime) override
{
auto& io = ImGui::GetIO();
ImGui::Text("FPS: %.2f (%.2gms)", io.Framerate, io.Framerate ? 1000.0f / io.Framerate : 0.0f);
ImGui::Separator();
auto availableRegion = ImGui::GetContentRegionAvail();
static float s_SplitterSize = 6.0f;
static float s_SplitterArea = 0.0f;
static float s_LeftPaneSize = 0.0f;
static float s_RightPaneSize = 0.0f;
if (s_SplitterArea != availableRegion.x)
{
if (s_SplitterArea == 0.0f)
{
s_SplitterArea = availableRegion.x;
s_LeftPaneSize = ImFloor(availableRegion.x * 0.25f);
s_RightPaneSize = availableRegion.x - s_LeftPaneSize - s_SplitterSize;
}
else
{
auto ratio = availableRegion.x / s_SplitterArea;
s_SplitterArea = availableRegion.x;
s_LeftPaneSize = s_LeftPaneSize * ratio;
s_RightPaneSize = availableRegion.x - s_LeftPaneSize - s_SplitterSize;
}
}
static ImGuiEx::Canvas canvas;
static ImVec2 drawStartPoint;
static bool isDragging = false;
static ImRect panelRect;
Splitter(true, s_SplitterSize, &s_LeftPaneSize, &s_RightPaneSize, 100.0f, 100.0f);
auto canvasRect = canvas.Rect();
auto viewRect = canvas.ViewRect();
auto viewOrigin = canvas.ViewOrigin();
auto viewScale = canvas.ViewScale();
ImGui::BeginChild("##top", ImVec2(s_LeftPaneSize, -1), false, ImGuiWindowFlags_NoScrollWithMouse);
ImGui::TextUnformatted("Rect:");
ImGui::BeginColumns("rect", 2, ImGuiOldColumnFlags_NoBorder);
ImGui::SetColumnWidth(0, ImGui::CalcTextSize("\t\tL: 0000.00\t").x);
ImGui::Text("\tL: %.2f", canvasRect.Min.x); ImGui::NextColumn();
ImGui::Text("\tT: %.2f", canvasRect.Min.y); ImGui::NextColumn();
ImGui::Text("\tR: %.2f", canvasRect.Max.x); ImGui::NextColumn();
ImGui::Text("\tB: %.2f", canvasRect.Max.y); ImGui::NextColumn();
ImGui::Text("\tW: %.2f", canvasRect.GetWidth()); ImGui::NextColumn();
ImGui::Text("\tH: %.2f", canvasRect.GetHeight()); ImGui::NextColumn();
ImGui::EndColumns();
ImGui::TextUnformatted("View Rect:");
ImGui::BeginColumns("viewrect", 2, ImGuiOldColumnFlags_NoBorder);
ImGui::SetColumnWidth(0, ImGui::CalcTextSize("\t\tL: 0000.00\t").x);
ImGui::Text("\tL: %.2f", viewRect.Min.x); ImGui::NextColumn();
ImGui::Text("\tT: %.2f", viewRect.Min.y); ImGui::NextColumn();
ImGui::Text("\tR: %.2f", viewRect.Max.x); ImGui::NextColumn();
ImGui::Text("\tB: %.2f", viewRect.Max.y); ImGui::NextColumn();
ImGui::Text("\tW: %.2f", viewRect.GetWidth()); ImGui::NextColumn();
ImGui::Text("\tH: %.2f", viewRect.GetHeight()); ImGui::NextColumn();
ImGui::EndColumns();
ImGui::TextUnformatted("Origin:");
ImGui::Indent();
auto originChanged = false;
ImGui::PushItemWidth(-ImGui::GetStyle().IndentSpacing);
originChanged |= ImGui::DragFloat("##originx", &viewOrigin.x, 1.0f);
originChanged |= ImGui::DragFloat("##originy", &viewOrigin.y, 1.0f);
if (originChanged) canvas.SetView(viewOrigin, viewScale);
ImGui::PopItemWidth();
ImGui::Unindent();
ImGui::TextUnformatted("Scale:");
ImGui::Indent();
ImGui::PushItemWidth(-ImGui::GetStyle().IndentSpacing);
if (ImGui::DragFloat("##scale", &viewScale, 0.01f, 0.01f, 15.0f))
canvas.SetView(viewOrigin, viewScale);
ImGui::PopItemWidth();
ImGui::Unindent();
ImGui::Separator();
if (ImGui::Button("Center over Panel", ImVec2(s_LeftPaneSize, 0)))
canvas.CenterView(panelRect.GetCenter());
if (ImGui::Button("Center and zoom to Panel", ImVec2(s_LeftPaneSize, 0)))
canvas.CenterView(panelRect);
ImGui::TextUnformatted("Panel Rect:");
ImGui::BeginColumns("panelrect", 2, ImGuiOldColumnFlags_NoBorder);
ImGui::SetColumnWidth(0, ImGui::CalcTextSize("\t\tL: 0000.00\t").x);
ImGui::Text("\tL: %.2f", panelRect.Min.x); ImGui::NextColumn();
ImGui::Text("\tT: %.2f", panelRect.Min.y); ImGui::NextColumn();
ImGui::Text("\tR: %.2f", panelRect.Max.x); ImGui::NextColumn();
ImGui::Text("\tB: %.2f", panelRect.Max.y); ImGui::NextColumn();
ImGui::Text("\tW: %.2f", panelRect.GetWidth()); ImGui::NextColumn();
ImGui::Text("\tH: %.2f", panelRect.GetHeight()); ImGui::NextColumn();
ImGui::EndColumns();
ImGui::EndChild();
ImGui::SameLine(0.0f, s_SplitterSize);
if (canvas.Begin("##mycanvas", ImVec2(s_RightPaneSize, 0.0f)))
{
//auto drawList = ImGui::GetWindowDrawList();
if ((isDragging || ImGui::IsItemHovered()) && ImGui::IsMouseDragging(1, 0.0f))
{
if (!isDragging)
{
isDragging = true;
drawStartPoint = viewOrigin;
}
canvas.SetView(drawStartPoint + ImGui::GetMouseDragDelta(1, 0.0f) * viewScale, viewScale);
}
else if (isDragging)
isDragging = false;
viewRect = canvas.ViewRect();
if (viewRect.Max.x > 0.0f)
DrawScale(ImVec2(0.0f, 0.0f), ImVec2(viewRect.Max.x, 0.0f), 100.0f, 10.0f, 0.6f);
if (viewRect.Min.x < 0.0f)
DrawScale(ImVec2(0.0f, 0.0f), ImVec2(viewRect.Min.x, 0.0f), 100.0f, 10.0f, 0.6f, -1.0f);
if (viewRect.Max.y > 0.0f)
DrawScale(ImVec2(0.0f, 0.0f), ImVec2(0.0f, viewRect.Max.y), 100.0f, 10.0f, 0.6f);
if (viewRect.Min.y < 0.0f)
DrawScale(ImVec2(0.0f, 0.0f), ImVec2(0.0f, viewRect.Min.y), 100.0f, 10.0f, 0.6f, -1.0f);
ImGui::Text("Hovered: %d", ImGui::IsItemHovered() ? 1 : 0);
ImGui::TextUnformatted("Hello World!");
ImGui::Bullet();
ImGui::Button("Panel", ImVec2(s_RightPaneSize * 0.75f, availableRegion.y * 0.5f) * 0.5f);
panelRect.Min = ImGui::GetItemRectMin();
panelRect.Max = ImGui::GetItemRectMax();
canvas.End();
}
//ed::SetCurrentEditor(g_Context);
//ed::Begin("My Editor", ImVec2(0.0, 0.0f));
//int uniqueId = 1;
//// Start drawing nodes.
//ed::BeginNode(uniqueId++);
// ImGui::Text("Node A");
// ed::BeginPin(uniqueId++, ed::PinKind::Input);
// ImGui::Text("-> In");
// ed::EndPin();
// ImGui::SameLine();
// ed::BeginPin(uniqueId++, ed::PinKind::Output);
// ImGui::Text("Out ->");
// ed::EndPin();
//ed::EndNode();
//ed::End();
//ed::SetCurrentEditor(nullptr);
//ImGui::ShowMetricsWindow();
}
};
int Main(int argc, char** argv)
{
Example exampe("Canvas", argc, argv);
if (exampe.Create())
return exampe.Run();
return 0;
}
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