alive forever
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Автор темы
- #1
Код:
static bool MyKnob(const char* label, float* p_value, float v_min, float v_max)
{
ImGuiIO& io = ImGui::GetIO();
ImGuiStyle& style = ImGui::GetStyle();
float radius_outer = 20.0f;
ImVec2 pos = ImGui::GetCursorScreenPos();
ImVec2 center = ImVec2(pos.x + radius_outer, pos.y + radius_outer);
float line_height = ImGui::GetTextLineHeight();
ImDrawList* draw_list = ImGui::GetWindowDrawList();
float ANGLE_MIN = 3.141592f * 0.75f;
float ANGLE_MAX = 3.141592f * 2.25f;
ImGui::InvisibleButton(label, ImVec2(radius_outer*2, radius_outer*2 + line_height + style.ItemInnerSpacing.y));
bool value_changed = false;
bool is_active = ImGui::IsItemActive();
bool is_hovered = ImGui::IsItemActive();
if (is_active && io.MouseDelta.x != 0.0f)
{
float step = (v_max - v_min) / 200.0f;
*p_value += io.MouseDelta.x * step;
if (*p_value < v_min) *p_value = v_min;
if (*p_value > v_max) *p_value = v_max;
value_changed = true;
}
float t = (*p_value - v_min) / (v_max - v_min);
float angle = ANGLE_MIN + (ANGLE_MAX - ANGLE_MIN) * t;
float angle_cos = cosf(angle), angle_sin = sinf(angle);
float radius_inner = radius_outer*0.40f;
draw_list->AddCircleFilled(center, radius_outer, ImGui::GetColorU32(ImGuiCol_FrameBg), 16);
draw_list->AddLine(ImVec2(center.x + angle_cos*radius_inner, center.y + angle_sin*radius_inner), ImVec2(center.x + angle_cos*(radius_outer-2), center.y + angle_sin*(radius_outer-2)), ImGui::GetColorU32(ImGuiCol_SliderGrabActive), 2.0f);
draw_list->AddCircleFilled(center, radius_inner, ImGui::GetColorU32(is_active ? ImGuiCol_FrameBgActive : is_hovered ? ImGuiCol_FrameBgHovered : ImGuiCol_FrameBg), 16);
draw_list->AddText(ImVec2(pos.x, pos.y + radius_outer * 2 + style.ItemInnerSpacing.y), ImGui::GetColorU32(ImGuiCol_Text), label);
if (is_active || is_hovered)
{
ImGui::SetNextWindowPos(ImVec2(pos.x - style.WindowPadding.x, pos.y - line_height - style.ItemInnerSpacing.y - style.WindowPadding.y));
ImGui::BeginTooltip();
ImGui::Text("%.3f", *p_value);
ImGui::EndTooltip();
}
return value_changed;
}
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