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#pragma once
struct TreeDrawer
{
const ImColor TreeLineColor = ImColor(128, 128, 128, 255); // ImGui::GetColorU32(ImGuiCol_Text);
const float SmallOffsetX = 11.0f; // for now, a hardcoded value; should take into account tree indent size
ImDrawList *drawList;
ImVec2 verticalLineStart;
ImVec2 verticalLineEnd;
void start()
{
drawList = ImGui::GetWindowDrawList();
verticalLineStart = ImGui::GetCursorScreenPos();
verticalLineStart.x += SmallOffsetX; // to nicely line up with the arrow symbol
verticalLineEnd = verticalLineStart;
}
void node()
{
const float HorizontalTreeLineSize = 8.0f; // chosen arbitrarily
const ImRect childRect = ImRect(ImGui::GetItemRectMin(), ImGui::GetItemRectMax()); // RenderTree(child);
const float midpoint = (childRect.Min.y + childRect.Max.y) / 2.0f;
drawList->AddLine(ImVec2(verticalLineStart.x, midpoint), ImVec2(verticalLineStart.x + HorizontalTreeLineSize, midpoint), TreeLineColor);
verticalLineEnd.y = midpoint;
}
float end()
{
drawList->AddLine(verticalLineStart, verticalLineEnd, TreeLineColor);
return verticalLineEnd.y - verticalLineStart.y;
}
};
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