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
|
// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
/*
screenwidget.cpp
A widget to display colour components from an image using independently
selected colors. Controls are provided to allow the image to be inverted, and
the color to be selection via a standard dialog. The image is displayed in a
label widget.
*/
#include <QApplication>
#include <QColorDialog>
#include <QGridLayout>
#include <QImage>
#include <QLabel>
#include <QMenu>
#include <QMimeData>
#include <QMouseEvent>
#include <QPixmap>
#include <QPushButton>
#include <QWidget>
#include "screenwidget.h"
/*!
Initializes the paint color, the mask color (cyan, magenta,
or yellow), connects the color selector and invert checkbox to functions,
and creates a two-by-two grid layout.
*/
ScreenWidget::ScreenWidget(QWidget *parent, QColor initialColor,
const QString &name, Separation mask,
const QSize &labelSize)
: QFrame(parent)
{
paintColor = initialColor;
maskColor = mask;
inverted = false;
imageLabel = new QLabel;
imageLabel->setFrameShadow(QFrame::Sunken);
imageLabel->setFrameShape(QFrame::StyledPanel);
imageLabel->setMinimumSize(labelSize);
nameLabel = new QLabel(name);
colorButton = new QPushButton(tr("Modify..."));
colorButton->setBackgroundRole(QPalette::Button);
colorButton->setMinimumSize(32, 32);
QPalette palette(colorButton->palette());
palette.setColor(QPalette::Button, initialColor);
colorButton->setPalette(palette);
invertButton = new QPushButton(tr("Invert"));
//invertButton->setToggleButton(true);
//invertButton->setOn(inverted);
invertButton->setEnabled(false);
connect(colorButton, &QPushButton::clicked, this, &ScreenWidget::setColor);
connect(invertButton, &QPushButton::clicked, this, &ScreenWidget::invertImage);
QGridLayout *gridLayout = new QGridLayout(this);
gridLayout->addWidget(imageLabel, 0, 0, 1, 2);
gridLayout->addWidget(nameLabel, 1, 0);
gridLayout->addWidget(colorButton, 1, 1);
gridLayout->addWidget(invertButton, 2, 1, 1, 1);
}
/*!
Creates a new image by separating out the cyan, magenta, or yellow
component, depending on the mask color specified in the constructor.
The amount of the component found in each pixel of the image is used
to determine how much of a user-selected ink is used for each pixel
in the new image for the label widget.
*/
void ScreenWidget::createImage()
{
newImage = originalImage.copy();
// Create CMY components for the ink being used.
float cyanInk = (255 - paintColor.red())/255.0;
float magentaInk = (255 - paintColor.green())/255.0;
float yellowInk = (255 - paintColor.blue())/255.0;
int (*convert)(QRgb);
switch (maskColor) {
case Cyan:
convert = qRed;
break;
case Magenta:
convert = qGreen;
break;
case Yellow:
convert = qBlue;
break;
}
for (int y = 0; y < newImage.height(); ++y) {
for (int x = 0; x < newImage.width(); ++x) {
QRgb p(originalImage.pixel(x, y));
// Separate the source pixel into its cyan component.
int amount;
if (inverted)
amount = convert(p);
else
amount = 255 - convert(p);
QColor newColor(
255 - qMin(int(amount * cyanInk), 255),
255 - qMin(int(amount * magentaInk), 255),
255 - qMin(int(amount * yellowInk), 255));
newImage.setPixel(x, y, newColor.rgb());
}
}
imageLabel->setPixmap(QPixmap::fromImage(newImage));
}
/*!
Returns a pointer to the modified image.
*/
QImage* ScreenWidget::image()
{
return &newImage;
}
/*!
Sets whether the amount of ink applied to the canvas is to be inverted
(subtracted from the maximum value) before the ink is applied.
*/
void ScreenWidget::invertImage()
{
//inverted = invertButton->isOn();
inverted = !inverted;
createImage();
emit imageChanged();
}
/*!
Separate the current image into cyan, magenta, and yellow components.
Create a representation of how each component might appear when applied
to a blank white piece of paper.
*/
void ScreenWidget::setColor()
{
QColor newColor = QColorDialog::getColor(paintColor);
if (newColor.isValid()) {
paintColor = newColor;
QPalette palette(colorButton->palette());
palette.setColor(QPalette::Button, paintColor);
colorButton->setPalette(palette);
createImage();
emit imageChanged();
}
}
/*!
Records the original image selected by the user, creates a color
separation, and enables the invert image checkbox.
*/
void ScreenWidget::setImage(QImage &image)
{
originalImage = image;
createImage();
invertButton->setEnabled(true);
}
|
