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#include "imgui.h"
#include <math.h>
#include <stdio.h>
#define PI 3.1415926535897932384626433832795f
typedef unsigned int u32;
inline float lerp(float a, float b, float t) { return a+(b-a)*t; }
inline float saturate(float a) { return (a<0.f)?0.f:(a>1.f)?1.f:a; }
inline float length(float x, float y ){ return sqrtf(x*x+y*y); }
int TactileButton(const char *label, float size) {
ImVec4 hilitecol = ImGui::GetStyle().Colors[ImGuiCol_FrameBg];
hilitecol.x+=0.1f;
auto style=ImGui::GetStyle();
ImDrawList* draw_list = ImGui::GetWindowDrawList();
ImVec2 mouse_pos = ImGui::GetIO().MousePos;
ImVec2 canvas_pos = ImGui::GetCursorScreenPos(); // ImDrawList API uses screen coordinates!
float w=size,/*ImGui::CalcItemWidth(),*/ h=size;
ImVec2 canvas_size = ImVec2(w,h);
ImVec2 centre=ImVec2(canvas_pos.x+w*0.5f,canvas_pos.y+h*0.45f);
ImGui::InvisibleButton(label, canvas_size);
draw_list->PushClipRect(canvas_pos, ImVec2(canvas_pos.x+canvas_size.x, canvas_pos.y+canvas_size.y),true); // clip lines within the canvas (if we resize it, etc.)
bool active=ImGui::IsItemActive();
draw_list->AddCircleFilled(ImVec2(centre.x,centre.y),h*0.45f,active ? 0x80ffffff : 0x40ffffff, 32);
ImVec2 labelsize=ImGui::CalcTextSize(label);
draw_list->AddText(ImVec2(centre.x-labelsize.x*0.5f,canvas_pos.y-labelsize.y+h*0.5f),ImColor(style.Colors[ImGuiCol_Text]),label);
draw_list->PopClipRect();
return active;
}
int Knob(const char *label, float &curval, float *randamount, float minval, float maxval, u32 encodercol, float size)
{
ImVec4 hilitecol = ImGui::GetStyle().Colors[ImGuiCol_FrameBg];
hilitecol.x+=0.1f*(curval-minval)/(maxval-minval);
// hilitecol.z-=0.3f;
static ImVec2 click_pos;
static float click_val,click_rand;
static int grabrand;
static bool clickedbutton;
auto style=ImGui::GetStyle();
ImDrawList* draw_list = ImGui::GetWindowDrawList();
ImVec2 mouse_pos = ImGui::GetIO().MousePos;
ImVec2 canvas_pos = ImGui::GetCursorScreenPos(); // ImDrawList API uses screen coordinates!
float w=size,/*ImGui::CalcItemWidth(),*/ h=size;
ImVec2 canvas_size = ImVec2(w,h);
ImVec2 centre=ImVec2(canvas_pos.x+w*0.5f,canvas_pos.y+h*0.45f);
ImGui::InvisibleButton(label, canvas_size);
draw_list->PushClipRect(canvas_pos, ImVec2(canvas_pos.x+canvas_size.x, canvas_pos.y+canvas_size.y),true); // clip lines within the canvas (if we resize it, etc.)
float rad=h*0.4f;
ImColor bg= hilitecol;// : style.Colors[ImGuiCol_FrameBg];
u32 tickcol=0x80ffffff;
if (encodercol==1)
encodercol=bg;
float angrange=encodercol ? 3.141592f : 2.5f;
float curang=lerp(-angrange,angrange,(curval-minval)/(maxval-minval));
draw_list->PathClear();
draw_list->PathArcTo(centre,rad,-angrange - PI/2,angrange - PI/2,20);
draw_list->PathStroke(bg,false,rad*0.2f);
bool active=ImGui::IsItemActive();
if (active && ImGui::IsMouseClicked(0)) {
clickedbutton=false;
click_pos=mouse_pos; click_val=curval; click_rand=randamount ? *randamount : 0.f;
grabrand=randamount && ImGui::GetIO().KeyShift;
if (length(mouse_pos.x-centre.x, mouse_pos.y-centre.y)<h*0.3f)
clickedbutton=true;
}
if (!encodercol) {
draw_list->PathClear();
draw_list->PathArcTo(centre,rad,-angrange-PI/2,curang-PI/2,20);
draw_list->PathStroke(tickcol,false,rad*0.2f);
} else {
draw_list->AddCircleFilled(ImVec2(centre.x,centre.y),h*0.3f,active && clickedbutton ? tickcol : encodercol, 32);
}
draw_list->AddCircleFilled(ImVec2(centre.x+0.f,centre.y-h*0.48f),h*0.02f,tickcol);
ImColor barcol=(style.Colors[ImGuiCol_SliderGrabActive]); //:(i==hover)?ImGuiCol_CheckMark:ImGuiCol_ScrollbarGrab]))
if (randamount && *randamount>0.f) {
float minang=curang-angrange**randamount; if (minang<-angrange) minang=-angrange;
float maxang=minang+angrange**randamount; if (maxang>angrange) { maxang=angrange; minang=maxang-angrange**randamount*2.f; }
draw_list->PathClear();
draw_list->PathArcTo(centre,rad,minang,maxang,20);
draw_list->PathStroke(barcol,false,rad*0.05f);
}
float rad0=rad*0.4f;
float rad2=rad+0.05f*h;
draw_list->AddLine(ImVec2(centre.x+rad0*sinf(curang),centre.y-rad0*cosf(curang)), ImVec2(centre.x+rad2*sinf(curang),centre.y-rad2*cosf(curang)),tickcol, 2.f);
int rv=0;
if (active) {
float angdelta = -atan2f(mouse_pos.x-centre.x, mouse_pos.y-centre.y) + atan2f(click_pos.x-centre.x,click_pos.y-centre.y);
// if (clickedbutton)
// angdelta=0.f;
if (angdelta>PI) angdelta-=PI*2.f;
if (angdelta<-PI) angdelta+=PI*2.f;
angdelta*=1.f/(angrange*2.f);
// ImVec2 delta(mouse_pos.x-click_pos.x,mouse_pos.y-click_pos.y);
// float angdelta=((fabsf(delta.x)>fabsf(delta.y)) ? delta.x : -delta.y) / h;
if (grabrand && randamount)
*randamount=saturate(click_rand+angdelta);
else
{
curval=click_val+angdelta*(maxval-minval);
if (!encodercol) {
if (curval<minval) curval=minval;
if (curval>maxval) curval=maxval;
}
}
click_pos=mouse_pos; click_val=curval; click_rand=randamount ? *randamount : 0.f;
}
draw_list->PopClipRect();
// char valuebuf[64];
//snprintf(valuebuf,sizeof(valuebuf),"%.1f%%",curval*100.f);
ImVec2 labelsize=ImGui::CalcTextSize(label);
// ImVec2 valuesize=ImGui::CalcTextSize(valuebuf);
draw_list->AddText(ImVec2(centre.x-labelsize.x*0.5f,canvas_pos.y-labelsize.y+h*0.5f),ImColor(style.Colors[ImGuiCol_Text]),label);
// if (!encodercol)
// draw_list->AddText(ImVec2(centre.x-valuesize.x*0.5f,canvas_pos.y+canvas_size.y-valuesize.y-2.f),ImColor(style.Colors[ImGuiCol_Text]),valuebuf);
return clickedbutton && active;
}
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