imguiHelpers.h

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#pragma once
 
#include "AppState.h"
 
#include <imgui.h>
#include <stdio.h>
 
extern AppState app;
 
inline void DrawScreenspaceText(float x, float y, ImU32 color, const char* text, bool centered = false)
{
    if (centered)
    {
        const ImVec2 textSize = ImGui::CalcTextSize(text);
        x -= textSize.x * 0.5f;
    }
 
    ImGui::GetForegroundDrawList()->AddText({x, y}, color, text);
}
 
inline void DrawWorldspaceText(float x, float y, float z, ImU32 color, const char* text, bool centered = false, float offsetY = 0.0f)
{
    float screenX;
    float screenY;
    app.worldToScreen(x, y, z, &screenX, &screenY);
    screenY += offsetY;
 
    if (centered)
    {
        const ImVec2 textSize = ImGui::CalcTextSize(text);
        screenX -= textSize.x * 0.5f;
    }
 
    ImGui::GetForegroundDrawList()->AddText({screenX, screenY}, color, text);
}
 
inline void DrawFloatSlider(
    float* value,
    float min,
    float max,
    const char* id,
    const char* label,
    const char* valueFormat = "%.2f")
{
    // Draw the slider
    ImGui::PushItemWidth(ImGui::GetContentRegionAvail().x);
    ImGui::SliderFloat(id, value, min, max, "");
    ImGui::PopItemWidth();
 
    // Get the bounds of the slider
    ImVec2 sliderMin = ImGui::GetItemRectMin();
    ImVec2 sliderMax = ImGui::GetItemRectMax();
    ImVec2 sliderSize = ImGui::GetItemRectSize();
 
    ImDrawList* drawList = ImGui::GetWindowDrawList();
    ImU32 color = ImGui::GetColorU32(ImGuiCol_Text);
 
    // Draw the label left-aligned inside the slider
    constexpr int textPadding = 6;
    ImVec2 labelSize = ImGui::CalcTextSize(label);
    float textY = sliderMin.y + (sliderSize.y - labelSize.y) * 0.5f;
    drawList->AddText(ImVec2(sliderMin.x + textPadding, textY), color, label);
 
    // Draw the value label right-aligned inside the slider
    char valueLabel[32];
    snprintf(valueLabel, sizeof(valueLabel), valueFormat, *value);
    ImVec2 valueLabelSize = ImGui::CalcTextSize(valueLabel);
    drawList->AddText(ImVec2(sliderMax.x - valueLabelSize.x - textPadding, textY), color, valueLabel);
}
 
inline void DrawIntSlider(int* value, int min, int max, const char* id, const char* label, const char* valueFormat = "%d")
{
    // Draw the slider
    ImGui::PushItemWidth(ImGui::GetContentRegionAvail().x);
    ImGui::SliderInt(id, value, min, max, "");
    ImGui::PopItemWidth();
 
    // Get the bounds of the slider
    ImVec2 sliderMin = ImGui::GetItemRectMin();
    ImVec2 sliderMax = ImGui::GetItemRectMax();
    ImVec2 sliderSize = ImGui::GetItemRectSize();
 
    ImDrawList* drawList = ImGui::GetWindowDrawList();
    ImU32 color = ImGui::GetColorU32(ImGuiCol_Text);
 
    // Draw the label left-aligned inside the slider
    constexpr int textPadding = 6;
    ImVec2 labelSize = ImGui::CalcTextSize(label);
    float textY = sliderMin.y + (sliderSize.y - labelSize.y) * 0.5f;
    drawList->AddText(ImVec2(sliderMin.x + textPadding, textY), color, label);
 
    // Draw the value label right-aligned inside the slider
    char valueLabel[32];
    snprintf(valueLabel, sizeof(valueLabel), valueFormat, *value);
    ImVec2 valueLabelSize = ImGui::CalcTextSize(valueLabel);
    drawList->AddText(ImVec2(sliderMax.x - valueLabelSize.x - textPadding, textY), color, valueLabel);
}
 
inline void DrawRightAlignedText(const char* format, ...)
{
    static char text[2048];
 
    va_list args;
    va_start(args, format);
    vsnprintf(text, sizeof(text), format, args);
    va_end(args);
 
    float textWidth = ImGui::CalcTextSize(text).x;
    float parentWidth = ImGui::GetContentRegionAvail().x;
 
    ImGui::SetCursorPosX(ImGui::GetCursorPosX() + parentWidth - textWidth);
    ImGui::Text("%s", text);
}