-
Notifications
You must be signed in to change notification settings - Fork 47
/
Copy pathimgui-knobs.cpp
394 lines (345 loc) · 15.3 KB
/
imgui-knobs.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
#include "imgui-knobs.h"
#include <cmath>
#include <cstdlib>
#include <imgui.h>
#include <imgui_internal.h>
#define IMGUIKNOBS_PI 3.14159265358979323846f
static inline float ImLog(int x) { return ImLog(static_cast<float>(x)); }
namespace ImGuiKnobs {
namespace detail {
void draw_arc(ImVec2 center, float radius, float start_angle, float end_angle, float thickness, ImColor color) {
auto *draw_list = ImGui::GetWindowDrawList();
draw_list->PathArcTo(center, radius, start_angle, end_angle);
draw_list->PathStroke(color, 0, thickness);
}
template<typename DataType>
struct knob {
float radius;
bool value_changed;
ImVec2 center;
bool is_active;
bool is_hovered;
float angle_min;
float angle_max;
float t;
float angle;
float angle_cos;
float angle_sin;
knob(const char *_label,
ImGuiDataType data_type,
DataType *p_value,
DataType v_min,
DataType v_max,
float speed,
float _radius,
const char *format,
ImGuiKnobFlags flags,
float _angle_min,
float _angle_max) {
radius = _radius;
if (flags & ImGuiKnobFlags_Logarithmic) {
float v = ImMax(ImMin(*p_value, v_max), v_min);
t = (ImLog(ImAbs(v)) - ImLog(ImAbs(v_min))) / (ImLog(ImAbs(v_max)) - ImLog(ImAbs(v_min)));
} else {
t = ((float) *p_value - v_min) / (v_max - v_min);
}
auto screen_pos = ImGui::GetCursorScreenPos();
// Handle dragging
ImGui::InvisibleButton(_label, {radius * 2.0f, radius * 2.0f});
// Handle drag: if DragVertical or DragHorizontal flags are set, only the given direction is
// used, otherwise use the drag direction with the highest delta
ImGuiIO &io = ImGui::GetIO();
bool drag_vertical =
!(flags & ImGuiKnobFlags_DragHorizontal) &&
(flags & ImGuiKnobFlags_DragVertical || ImAbs(io.MouseDelta[ImGuiAxis_Y]) > ImAbs(io.MouseDelta[ImGuiAxis_X]));
auto gid = ImGui::GetID(_label);
ImGuiSliderFlags drag_behaviour_flags = 0;
if (drag_vertical) {
drag_behaviour_flags |= ImGuiSliderFlags_Vertical;
}
if (flags & ImGuiKnobFlags_AlwaysClamp) {
drag_behaviour_flags |= ImGuiSliderFlags_AlwaysClamp;
}
if (flags & ImGuiKnobFlags_Logarithmic) {
drag_behaviour_flags |= ImGuiSliderFlags_Logarithmic;
}
value_changed = ImGui::DragBehavior(
gid,
data_type,
p_value,
speed,
&v_min,
&v_max,
format,
drag_behaviour_flags);
angle_min = _angle_min < 0 ? IMGUIKNOBS_PI * 0.75f : _angle_min;
angle_max = _angle_max < 0 ? IMGUIKNOBS_PI * 2.25f : _angle_max;
center = {screen_pos[0] + radius, screen_pos[1] + radius};
is_active = ImGui::IsItemActive();
is_hovered = ImGui::IsItemHovered();
angle = angle_min + (angle_max - angle_min) * t;
angle_cos = cosf(angle);
angle_sin = sinf(angle);
}
void draw_dot(float size, float radius, float angle, color_set color, bool filled, int segments) {
auto dot_size = size * this->radius;
auto dot_radius = radius * this->radius;
ImGui::GetWindowDrawList()->AddCircleFilled(
{center[0] + cosf(angle) * dot_radius,
center[1] + sinf(angle) * dot_radius},
dot_size,
is_active ? color.active : (is_hovered ? color.hovered : color.base),
segments);
}
void draw_tick(float start, float end, float width, float angle, color_set color) {
auto tick_start = start * radius;
auto tick_end = end * radius;
auto angle_cos = cosf(angle);
auto angle_sin = sinf(angle);
ImGui::GetWindowDrawList()->AddLine(
{center[0] + angle_cos * tick_end, center[1] + angle_sin * tick_end},
{center[0] + angle_cos * tick_start,
center[1] + angle_sin * tick_start},
is_active ? color.active : (is_hovered ? color.hovered : color.base),
width * radius);
}
void draw_circle(float size, color_set color, bool filled, int segments) {
auto circle_radius = size * radius;
ImGui::GetWindowDrawList()->AddCircleFilled(
center,
circle_radius,
is_active ? color.active : (is_hovered ? color.hovered : color.base));
}
void draw_arc(float radius, float size, float start_angle, float end_angle, color_set color) {
auto track_radius = radius * this->radius;
auto track_size = size * this->radius * 0.5f + 0.0001f;
detail::draw_arc(center, track_radius, start_angle, end_angle, track_size, is_active ? color.active : (is_hovered ? color.hovered : color.base));
}
};
template<typename DataType>
knob<DataType> knob_with_drag(
const char *label,
ImGuiDataType data_type,
DataType *p_value,
DataType v_min,
DataType v_max,
float _speed,
const char *format,
float size,
ImGuiKnobFlags flags,
float angle_min,
float angle_max) {
if (flags & ImGuiKnobFlags_Logarithmic && v_min <= 0.0 && v_max >= 0.0) {
// we must handle the cornercase if a client specifies a logarithmic range that contains zero
// for this we clamp lower limit to avoid hitting zero like it is done in ImGui::SliderBehaviorT
const bool is_floating_point = (data_type == ImGuiDataType_Float) || (data_type == ImGuiDataType_Double);
const int decimal_precision = is_floating_point ? ImParseFormatPrecision(format, 3) : 1;
v_min = ImPow(0.1f, (float) decimal_precision);
v_max = ImMax(v_min, v_max); // this ensures that in the cornercase v_max is still at least ge v_min
*p_value = ImMax(ImMin(*p_value, v_max), v_min); // this ensures that in the cornercase p_value is within the range
}
auto speed = _speed == 0 ? (v_max - v_min) / 250.f : _speed;
ImGui::PushID(label);
auto width = size == 0 ? ImGui::GetTextLineHeight() * 4.0f : size * ImGui::GetIO().FontGlobalScale;
ImGui::PushItemWidth(width);
ImGui::BeginGroup();
// There's an issue with `SameLine` and Groups, see
// https://github.com/ocornut/imgui/issues/4190. This is probably not the best
// solution, but seems to work for now
ImGui::GetCurrentWindow()->DC.CurrLineTextBaseOffset = 0;
// Draw title
if (!(flags & ImGuiKnobFlags_NoTitle)) {
auto title_size = ImGui::CalcTextSize(label, NULL, false, width);
// Center title
ImGui::SetCursorPosX(ImGui::GetCursorPosX() +
(width - title_size[0]) * 0.5f);
ImGui::Text("%s", label);
}
// Draw knob
knob<DataType> k(label, data_type, p_value, v_min, v_max, speed, width * 0.5f, format, flags, angle_min, angle_max);
// Draw tooltip
if (flags & ImGuiKnobFlags_ValueTooltip &&
(ImGui::IsItemHovered(ImGuiHoveredFlags_AllowWhenDisabled) ||
ImGui::IsItemActive())) {
ImGui::BeginTooltip();
ImGui::Text(format, *p_value);
ImGui::EndTooltip();
}
// Draw input
if (!(flags & ImGuiKnobFlags_NoInput)) {
ImGuiSliderFlags drag_scalar_flags = 0;
if (flags & ImGuiKnobFlags_AlwaysClamp) {
drag_scalar_flags |= ImGuiSliderFlags_AlwaysClamp;
}
if (flags & ImGuiKnobFlags_Logarithmic) {
drag_scalar_flags |= ImGuiSliderFlags_Logarithmic;
}
auto changed = ImGui::DragScalar("###knob_drag", data_type, p_value, speed, &v_min, &v_max, format, drag_scalar_flags);
if (changed) {
k.value_changed = true;
}
}
ImGui::EndGroup();
ImGui::PopItemWidth();
ImGui::PopID();
return k;
}
color_set GetPrimaryColorSet() {
auto *colors = ImGui::GetStyle().Colors;
return {colors[ImGuiCol_ButtonActive], colors[ImGuiCol_ButtonHovered], colors[ImGuiCol_ButtonHovered]};
}
color_set GetSecondaryColorSet() {
auto *colors = ImGui::GetStyle().Colors;
auto active = ImVec4(colors[ImGuiCol_ButtonActive].x * 0.5f,
colors[ImGuiCol_ButtonActive].y * 0.5f,
colors[ImGuiCol_ButtonActive].z * 0.5f,
colors[ImGuiCol_ButtonActive].w);
auto hovered = ImVec4(colors[ImGuiCol_ButtonHovered].x * 0.5f,
colors[ImGuiCol_ButtonHovered].y * 0.5f,
colors[ImGuiCol_ButtonHovered].z * 0.5f,
colors[ImGuiCol_ButtonHovered].w);
return {active, hovered, hovered};
}
color_set GetTrackColorSet() {
auto *colors = ImGui::GetStyle().Colors;
return {colors[ImGuiCol_Button], colors[ImGuiCol_Button], colors[ImGuiCol_Button]};
}
}// namespace detail
template<typename DataType>
bool BaseKnob(
const char *label,
ImGuiDataType data_type,
DataType *p_value,
DataType v_min,
DataType v_max,
float speed,
const char *format,
ImGuiKnobVariant variant,
float size,
ImGuiKnobFlags flags,
int steps,
float angle_min,
float angle_max) {
auto knob = detail::knob_with_drag(
label,
data_type,
p_value,
v_min,
v_max,
speed,
format,
size,
flags,
angle_min,
angle_max);
switch (variant) {
case ImGuiKnobVariant_Tick: {
knob.draw_circle(0.85f, detail::GetSecondaryColorSet(), true, 32);
knob.draw_tick(0.5f, 0.85f, 0.08f, knob.angle, detail::GetPrimaryColorSet());
break;
}
case ImGuiKnobVariant_Dot: {
knob.draw_circle(0.85f, detail::GetSecondaryColorSet(), true, 32);
knob.draw_dot(0.12f, 0.6f, knob.angle, detail::GetPrimaryColorSet(), true, 12);
break;
}
case ImGuiKnobVariant_Wiper: {
knob.draw_circle(0.7f, detail::GetSecondaryColorSet(), true, 32);
knob.draw_arc(0.8f, 0.41f, knob.angle_min, knob.angle_max, detail::GetTrackColorSet());
if (knob.t > 0.01f) {
knob.draw_arc(0.8f, 0.43f, knob.angle_min, knob.angle, detail::GetPrimaryColorSet());
}
break;
}
case ImGuiKnobVariant_WiperOnly: {
knob.draw_arc(0.8f, 0.41f, knob.angle_min, knob.angle_max, detail::GetTrackColorSet());
if (knob.t > 0.01) {
knob.draw_arc(0.8f, 0.43f, knob.angle_min, knob.angle, detail::GetPrimaryColorSet());
}
break;
}
case ImGuiKnobVariant_WiperDot: {
knob.draw_circle(0.6f, detail::GetSecondaryColorSet(), true, 32);
knob.draw_arc(0.85f, 0.41f, knob.angle_min, knob.angle_max, detail::GetTrackColorSet());
knob.draw_dot(0.1f, 0.85f, knob.angle, detail::GetPrimaryColorSet(), true, 12);
break;
}
case ImGuiKnobVariant_Stepped: {
for (auto n = 0.f; n < steps; n++) {
auto a = n / (steps - 1);
auto angle = knob.angle_min + (knob.angle_max - knob.angle_min) * a;
knob.draw_tick(0.7f, 0.9f, 0.04f, angle, detail::GetPrimaryColorSet());
}
knob.draw_circle(0.6f, detail::GetSecondaryColorSet(), true, 32);
knob.draw_dot(0.12f, 0.4f, knob.angle, detail::GetPrimaryColorSet(), true, 12);
break;
}
case ImGuiKnobVariant_Space: {
knob.draw_circle(0.3f - knob.t * 0.1f, detail::GetSecondaryColorSet(), true, 16);
if (knob.t > 0.01f) {
knob.draw_arc(0.4f, 0.15f, knob.angle_min - 1.0f, knob.angle - 1.0f, detail::GetPrimaryColorSet());
knob.draw_arc(0.6f, 0.15f, knob.angle_min + 1.0f, knob.angle + 1.0f, detail::GetPrimaryColorSet());
knob.draw_arc(0.8f, 0.15f, knob.angle_min + 3.0f, knob.angle + 3.0f, detail::GetPrimaryColorSet());
}
break;
}
}
return knob.value_changed;
}
bool Knob(
const char *label,
float *p_value,
float v_min,
float v_max,
float speed,
const char *format,
ImGuiKnobVariant variant,
float size,
ImGuiKnobFlags flags,
int steps,
float angle_min,
float angle_max) {
return BaseKnob(
label,
ImGuiDataType_Float,
p_value,
v_min,
v_max,
speed,
format,
variant,
size,
flags,
steps,
angle_min,
angle_max);
}
bool KnobInt(
const char *label,
int *p_value,
int v_min,
int v_max,
float speed,
const char *format,
ImGuiKnobVariant variant,
float size,
ImGuiKnobFlags flags,
int steps,
float angle_min,
float angle_max) {
return BaseKnob(
label,
ImGuiDataType_S32,
p_value,
v_min,
v_max,
speed,
format,
variant,
size,
flags,
steps,
angle_min,
angle_max);
}
}// namespace ImGuiKnobs