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Split SliderBehaviorCalcRatioFromValue() out from SliderBehavior()

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ocornut 2016-11-27 18:32:24 +01:00
parent 219e4fb8fb
commit 004e863727
1 changed files with 23 additions and 20 deletions
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43
imgui.cpp
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@ -6446,6 +6446,28 @@ float ImGui::RoundScalar(float value, int decimal_precision)
return negative ? -value : value; return negative ? -value : value;
} }
static inline float SliderBehaviorCalcRatioFromValue(float v, float v_min, float v_max, float power, float linear_zero_pos)
{
const bool is_non_linear = (power < 1.0f-0.00001f) && (power > 1.0f-0.00001f);
const float v_clamped = (v_min < v_max) ? ImClamp(v, v_min, v_max) : ImClamp(v, v_max, v_min);
if (is_non_linear)
{
if (v_clamped < 0.0f)
{
const float f = 1.0f - (v_clamped - v_min) / (ImMin(0.0f,v_max) - v_min);
return (1.0f - powf(f, 1.0f/power)) * linear_zero_pos;
}
else
{
const float f = (v_clamped - ImMax(0.0f,v_min)) / (v_max - ImMax(0.0f,v_min));
return linear_zero_pos + powf(f, 1.0f/power) * (1.0f - linear_zero_pos);
}
}
// Linear slider
return (v_clamped - v_min) / (v_max - v_min);
}
bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, float power, int decimal_precision, ImGuiSliderFlags flags) bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_min, float v_max, float power, int decimal_precision, ImGuiSliderFlags flags)
{ {
ImGuiContext& g = *GImGui; ImGuiContext& g = *GImGui;
@ -6539,26 +6561,7 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
} }
// Calculate slider grab positioning // Calculate slider grab positioning
float v_clamped = (v_min < v_max) ? ImClamp(*v, v_min, v_max) : ImClamp(*v, v_max, v_min); float grab_t = SliderBehaviorCalcRatioFromValue(*v, v_min, v_max, power, linear_zero_pos);
float grab_t;
if (is_non_linear)
{
if (v_clamped < 0.0f)
{
const float f = 1.0f - (v_clamped - v_min) / (ImMin(0.0f,v_max) - v_min);
grab_t = (1.0f - powf(f, 1.0f/power)) * linear_zero_pos;
}
else
{
const float f = (v_clamped - ImMax(0.0f,v_min)) / (v_max - ImMax(0.0f,v_min));
grab_t = linear_zero_pos + powf(f, 1.0f/power) * (1.0f - linear_zero_pos);
}
}
else
{
// Linear slider
grab_t = (v_clamped - v_min) / (v_max - v_min);
}
// Draw // Draw
if (!is_horizontal) if (!is_horizontal)