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Comments about using "power curves". Demo tweaks. (#648)

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This commit is contained in:
omar
2018-05-03 12:50:34 +02:00
parent 8a370f6491
commit d9fa1f869e
3 changed files with 7 additions and 7 deletions
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8
imgui.cpp
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@@ -8752,7 +8752,7 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
const float slider_usable_pos_min = (is_horizontal ? frame_bb.Min.x : frame_bb.Min.y) + grab_padding + grab_sz*0.5f;
const float slider_usable_pos_max = (is_horizontal ? frame_bb.Max.x : frame_bb.Max.y) - grab_padding - grab_sz*0.5f;
// For logarithmic sliders that cross over sign boundary we want the exponential increase to be symmetric around 0.0f
// For power curve sliders that cross over sign boundary we want the curve to be symmetric around 0.0f
float linear_zero_pos = 0.0f; // 0.0->1.0f
if (v_min * v_max < 0.0f)
{
@@ -8827,7 +8827,7 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
float new_value;
if (is_non_linear)
{
// Account for logarithmic scale on both sides of the zero
// Account for power curve scale on both sides of the zero
if (clicked_t < linear_zero_pos)
{
// Negative: rescale to the negative range before powering
@@ -8878,11 +8878,11 @@ bool ImGui::SliderBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v
return value_changed;
}
// Use power!=1.0 for logarithmic sliders.
// Adjust format to decorate the value with a prefix or a suffix.
// "%.3f" 1.234
// "%5.2f secs" 01.23 secs
// "Gold: %.0f" Gold: 1
// Use power != 1.0f for non-linear sliders.
bool ImGui::SliderFloat(const char* label, float* v, float v_min, float v_max, const char* format, float power)
{
ImGuiWindow* window = GetCurrentWindow();
@@ -9159,7 +9159,7 @@ bool ImGui::DragBehavior(const ImRect& frame_bb, ImGuiID id, float* v, float v_s
{
if (fabsf(power - 1.0f) > 0.001f)
{
// Logarithmic curve on both side of 0.0
// Power curve on both side of 0.0
float v0_abs = v_cur >= 0.0f ? v_cur : -v_cur;
float v0_sign = v_cur >= 0.0f ? 1.0f : -1.0f;
float v1 = powf(v0_abs, 1.0f / power) + (adjust_delta * v0_sign);