ImAnimate

Immediate Mode animation extension for Dear ImGui.

You don't need to track any current value, animation start or state.
You just provide your start and end values, as well as the duration in milliseconds and your curve.

Each call advances the value by one frame (ImGui::GetIO().DeltaTime), so call it once per frame per value. While you don't call it, the animation pauses. Setting the value yourself is fine, the animation continues from there.

Usage

Function Signature

void Animate(float aStartValue, float aEndValue, float aDurationMs, float* aValue, ECurve aCurve = ECurve::Linear);

Example: Hover Animation

The animation above is generated by the following code.

static float imgSize = 1.0f;
ImGui::Image(icon, ImVec2(imgSize, imgSize));
if (ImGui::IsItemHovered)
{
	ImGui::Animate(1.0f, 1.1f, 500, &imgSize, ECurve::InCubic);
}
else
{
	ImGui::Animate(1.1f, 1.0, 500, &imgSize, ECurve::OutCubic);
}

Easing functions

The following easing functions are currently implemented.

enum class ECurve
{
	Linear,

	InSine,
	OutSine,
	InOutSine,

	InQuad,
	OutQuad,
	InOutQuad,

	InCubic,
	OutCubic,
	InOutCubic,

	InQuart,
	OutQuart,
	InOutQuart,

	InQuint,
	OutQuint,
	InOutQuint,

	InExpo,
	OutExpo,
	InOutExpo,

	InCirc,
	OutCirc,
	InOutCirc
};