Animation Engine for Dear ImGui

ImAnim brings modern animation capabilities to ImGui applications. Write smooth, UI animations with minimal code.

// Animate anything in one line
float alpha = iam_tween_float(id, channel, hovered ? 1.0f : 0.5f, 0.3f, ease, policy, dt);

• Immediate-mode friendly - Works naturally with ImGui's paradigm
• Zero dependencies - Only requires Dear ImGui
• Large easing collection - 30+ easing functions including spring physics
• Perceptual color blending - OKLAB and OKLCH
• Responsive layouts - Anchor-relative animations that survive window resizing

#include "im_anim.h"

// Each frame
iam_update_begin_frame();
iam_clip_update(dt);

// Hover animation
bool hovered = ImGui::IsItemHovered();
float scale = iam_tween_float(
    ImGui::GetID("button"), ImHashStr("scale"),
    hovered ? 1.1f : 1.0f,
    0.15f,
    iam_ease_preset(iam_ease_out_back),
    iam_policy_crossfade,
    dt
);

Add two files to your project:

src/im_anim.h
src/im_anim.cpp

That's it. No build system changes, no external dependencies.

Full documentation in the docs/ folder:

The demo/ folder contains a comprehensive demo showcasing all features:

• Interactive easing curve visualizer
• Cubic bezier editor
• Spring physics playground
• All animation types with live controls
• Performance benchmarks