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Add support for zooming #134

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40 changes: 36 additions & 4 deletions example/color_node_editor.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -124,7 +124,7 @@ class ColorNodeEditor
{
public:
ColorNodeEditor() : graph_(), nodes_(), root_node_id_(-1),
minimap_location_(ImNodesMiniMapLocation_BottomRight) {}
minimap_location_(ImNodesMiniMapLocation_BottomRight), show_debug_info_(false) {}

void show()
{
Expand All @@ -138,6 +138,17 @@ class ColorNodeEditor

if (ImGui::BeginMenuBar())
{
if (ImGui::BeginMenu("View"))
{
if (ImGui::MenuItem("Reset Panning"))
ImNodes::EditorContextResetPanning(ImVec2());

if (ImGui::MenuItem("Reset Zoom"))
ImNodes::EditorContextSetZoom(1.0f);

ImGui::EndMenu();
}

if (ImGui::BeginMenu("Mini-map"))
{
const char* names[] = {
Expand Down Expand Up @@ -182,9 +193,24 @@ class ColorNodeEditor
ImGui::EndMenu();
}

if (ImGui::BeginMenu("Debug"))
{
ImGui::MenuItem("Show Debug Info", NULL, &show_debug_info_);
ImGui::EndMenu();
}

ImGui::EndMenuBar();
}

if (show_debug_info_)
{
if (ImGui::Begin("Debug Info", &show_debug_info_))
{
ImNodes::EditorContextDrawDebugInfo();
}
ImGui::End();
}

ImGui::TextUnformatted("Edit the color of the output color window using nodes.");
ImGui::Columns(2);
ImGui::TextUnformatted("A -- add node");
Expand All @@ -197,13 +223,10 @@ class ColorNodeEditor
}
ImGui::Columns(1);

ImNodes::BeginNodeEditor();

// Handle new nodes
// These are driven by the user, so we place this code before rendering the nodes
{
const bool open_popup = ImGui::IsWindowFocused(ImGuiFocusedFlags_RootAndChildWindows) &&
ImNodes::IsEditorHovered() &&
ImGui::IsKeyReleased(SDL_SCANCODE_A);

ImGui::PushStyleVar(ImGuiStyleVar_WindowPadding, ImVec2(8.f, 8.f));
Expand Down Expand Up @@ -304,6 +327,8 @@ class ColorNodeEditor
ImGui::PopStyleVar();
}

ImNodes::BeginNodeEditor();

for (const UiNode& node : nodes_)
{
switch (node.type)
Expand Down Expand Up @@ -545,6 +570,12 @@ class ColorNodeEditor
ImNodes::MiniMap(0.2f, minimap_location_);
ImNodes::EndNodeEditor();

if (ImGui::IsWindowHovered(ImGuiHoveredFlags_RootAndChildWindows))
{
auto zoom = ImNodes::EditorContextGetZoom() + ImGui::GetIO().MouseWheel * 0.1f;
ImNodes::EditorContextSetZoom(zoom, ImGui::GetMousePos());
}

// Handle new links
// These are driven by Imnodes, so we place the code after EndNodeEditor().

Expand Down Expand Up @@ -693,6 +724,7 @@ class ColorNodeEditor
std::vector<UiNode> nodes_;
int root_node_id_;
ImNodesMiniMapLocation minimap_location_;
bool show_debug_info_;
};

static ColorNodeEditor color_editor;
Expand Down
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