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
|
/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* Copyright (c) 2019-2020, William McPherson <willmcpherson2@gmail.com>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "RollWidget.h"
#include "AudioEngine.h"
#include <LibGUI/Painter.h>
#include <LibGUI/ScrollBar.h>
#include <math.h>
constexpr int note_height = 20;
constexpr int max_note_width = note_height * 2;
constexpr int roll_height = note_count * note_height;
constexpr int horizontal_scroll_sensitivity = 20;
constexpr int max_zoom = 1 << 8;
RollWidget::RollWidget(AudioEngine& audio_engine)
: m_audio_engine(audio_engine)
{
set_should_hide_unnecessary_scrollbars(true);
set_content_size({ 0, roll_height });
vertical_scrollbar().set_value(roll_height / 2);
}
RollWidget::~RollWidget()
{
}
void RollWidget::paint_event(GUI::PaintEvent& event)
{
m_roll_width = widget_inner_rect().width() * m_zoom_level;
set_content_size({ m_roll_width, roll_height });
// Divide the roll by the maximum note width. If we get fewer notes than
// our time signature requires, round up. Otherwise, round down to the
// nearest x*(2^y), where x is the base number of notes of our time
// signature. In other words, find a number that is a double of our time
// signature. For 4/4 that would be 16, 32, 64, 128 ...
m_num_notes = m_roll_width / max_note_width;
int time_signature_notes = beats_per_bar * notes_per_beat;
if (m_num_notes < time_signature_notes)
m_num_notes = time_signature_notes;
else
m_num_notes = time_signature_notes * pow(2, static_cast<int>(log2(m_num_notes / time_signature_notes)));
m_note_width = static_cast<double>(m_roll_width) / m_num_notes;
// This calculates the minimum number of rows needed. We account for a
// partial row at the top and/or bottom.
int y_offset = vertical_scrollbar().value();
int note_offset = y_offset / note_height;
int note_offset_remainder = y_offset % note_height;
int paint_area = widget_inner_rect().height() + note_offset_remainder;
if (paint_area % note_height != 0)
paint_area += note_height;
int notes_to_paint = paint_area / note_height;
int key_pattern_index = (notes_per_octave - 1) - (note_offset % notes_per_octave);
int x_offset = horizontal_scrollbar().value();
int horizontal_note_offset_remainder = fmod(x_offset, m_note_width);
int horizontal_paint_area = widget_inner_rect().width() + horizontal_note_offset_remainder;
if (fmod(horizontal_paint_area, m_note_width) != 0)
horizontal_paint_area += m_note_width;
int horizontal_notes_to_paint = horizontal_paint_area / m_note_width;
GUI::Painter painter(*this);
painter.translate(frame_thickness(), frame_thickness());
painter.translate(-horizontal_note_offset_remainder, -note_offset_remainder);
painter.add_clip_rect(event.rect());
for (int y = 0; y < notes_to_paint; ++y) {
int y_pos = y * note_height;
for (int x = 0; x < horizontal_notes_to_paint; ++x) {
// This is needed to avoid rounding errors. You can't just use
// m_note_width as the width.
int x_pos = x * m_note_width;
int next_x_pos = (x + 1) * m_note_width;
int distance_to_next_x = next_x_pos - x_pos;
Gfx::Rect rect(x_pos, y_pos, distance_to_next_x, note_height);
if (key_pattern[key_pattern_index] == Black)
painter.fill_rect(rect, Color::LightGray);
else
painter.fill_rect(rect, Color::White);
painter.draw_line(rect.top_right(), rect.bottom_right(), Color::Black);
painter.draw_line(rect.bottom_left(), rect.bottom_right(), Color::Black);
}
if (--key_pattern_index == -1)
key_pattern_index = notes_per_octave - 1;
}
painter.translate(-x_offset, -y_offset);
painter.translate(horizontal_note_offset_remainder, note_offset_remainder);
for (int note = note_count - (note_offset + notes_to_paint); note <= (note_count - 1) - note_offset; ++note) {
for (auto roll_note : m_audio_engine.roll_notes(note)) {
int x = m_roll_width * (static_cast<double>(roll_note.on_sample) / roll_length);
int width = m_roll_width * (static_cast<double>(roll_note.length()) / roll_length);
if (x + width < x_offset || x > x_offset + widget_inner_rect().width())
continue;
if (width < 2)
width = 2;
int y = ((note_count - 1) - note) * note_height;
int height = note_height;
Gfx::Rect rect(x, y, width, height);
painter.fill_rect(rect, note_pressed_color);
painter.draw_rect(rect, Color::Black);
}
}
int x = m_roll_width * (static_cast<double>(m_audio_engine.time()) / roll_length);
if (x > x_offset && x <= x_offset + widget_inner_rect().width())
painter.draw_line({ x, 0 }, { x, roll_height }, Gfx::Color::Black);
GUI::Frame::paint_event(event);
}
void RollWidget::mousedown_event(GUI::MouseEvent& event)
{
if (!widget_inner_rect().contains(event.x(), event.y()))
return;
int y = (event.y() + vertical_scrollbar().value()) - frame_thickness();
y /= note_height;
// There's a case where we can't just use x / m_note_width. For example, if
// your m_note_width is 3.1 you will have a rect starting at 3. When that
// leftmost pixel of the rect is clicked you will do 3 / 3.1 which is 0
// and not 1. We can avoid that case by shifting x by 1 if m_note_width is
// fractional, being careful not to shift out of bounds.
int x = (event.x() + horizontal_scrollbar().value()) - frame_thickness();
bool note_width_is_fractional = m_note_width - static_cast<int>(m_note_width) != 0;
bool x_is_not_last = x != widget_inner_rect().width() - 1;
if (note_width_is_fractional && x_is_not_last)
++x;
x /= m_note_width;
int note = (note_count - 1) - y;
u32 on_sample = roll_length * (static_cast<double>(x) / m_num_notes);
u32 off_sample = (roll_length * (static_cast<double>(x + 1) / m_num_notes)) - 1;
m_audio_engine.set_roll_note(note, on_sample, off_sample);
update();
}
// FIXME: Implement zoom and horizontal scroll events in LibGUI, not here.
void RollWidget::mousewheel_event(GUI::MouseEvent& event)
{
if (event.modifiers() & KeyModifier::Mod_Shift) {
horizontal_scrollbar().set_value(horizontal_scrollbar().value() + (event.wheel_delta() * horizontal_scroll_sensitivity));
return;
}
if (!(event.modifiers() & KeyModifier::Mod_Ctrl)) {
GUI::ScrollableWidget::mousewheel_event(event);
return;
}
double multiplier = event.wheel_delta() >= 0 ? 0.5 : 2;
if (m_zoom_level * multiplier > max_zoom)
return;
if (m_zoom_level * multiplier < 1) {
if (m_zoom_level == 1)
return;
m_zoom_level = 1;
} else {
m_zoom_level *= multiplier;
}
int absolute_x_of_pixel_at_cursor = horizontal_scrollbar().value() + event.position().x();
int absolute_x_of_pixel_at_cursor_after_resize = absolute_x_of_pixel_at_cursor * multiplier;
int new_scrollbar = absolute_x_of_pixel_at_cursor_after_resize - event.position().x();
m_roll_width = widget_inner_rect().width() * m_zoom_level;
set_content_size({ m_roll_width, roll_height });
horizontal_scrollbar().set_value(new_scrollbar);
}
|
