Javi
85 lines
2.9 KiB
C++
85 lines
2.9 KiB
C++
#include "colorslider.h"
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#include <QStyleOptionSlider>
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#include <QDebug>
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#include <QPainter>
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#include <QStyle>
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ColorSlider::ColorSlider(QWidget *parent)
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: QSlider(parent) {
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setMinimum(0);
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setMaximum(360);
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setOrientation(Qt::Horizontal);
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this->setRange(5, 355);
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setFixedSize(222, 14);
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setStyleSheet("ColorSlider::handle:horizontal {"
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"border: 1px solid rgba(0, 0, 0, 26);"
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"width: 4px;"
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"margin: 0;}"
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);
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}
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ColorSlider::~ColorSlider()
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{
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}
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//h∈(0, 360), s∈(0, 1), v∈(0, 1)
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QColor ColorSlider::getColor(qreal h, qreal s, qreal v) {
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int hi = int(h/60)%6;
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qreal f = h/60 - hi;
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qreal p = v*(1 - s);
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qreal q = v*(1 - f*s);
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qreal t = v*(1- (1 - f)*s);
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if (hi == 0) {
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return QColor(std::min(int(255*v), 255), std::min(int(255*t), 255), std::min(int(255*p), 255));
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} else if (hi == 1) {
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return QColor(std::min(int(255*q), 255), std::min(int(255*v), 255), std::min(int(255*p), 255));
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} else if(hi == 2) {
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return QColor(std::min(int(255*p), 255), std::min(int(255*v), 255), std::min(int(255*t), 255));
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} else if (hi == 3) {
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return QColor(std::min(int(255*p), 255), std::min(int(255*q), 255), std::min(int(255*v), 255));
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} else if(hi == 4) {
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return QColor(std::min(int(255*t), 255), std::min(int(255*p), 255), std::min(int(255*v), 255));
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} else {
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return QColor(std::min(int(255*v), 255), std::min(int(255*p), 255), int(255*q));
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}
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}
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void ColorSlider::paintEvent(QPaintEvent *ev)
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{
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QStyleOptionSlider opt;
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initStyleOption(&opt);
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opt.subControls = QStyle::SC_SliderGroove | QStyle::SC_SliderHandle;
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if (tickPosition() != NoTicks)
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{
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opt.subControls |= QStyle::SC_SliderTickmarks;
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}
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QRect groove_rect = style()->subControlRect(QStyle::CC_Slider, &opt, QStyle::SC_SliderGroove, this);
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int spacing = 6;
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QRect rect(groove_rect.left(), groove_rect.top(), groove_rect.width() + 1, groove_rect.height());
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing);
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QImage backgroundImage(rect.width(), rect.height() - spacing, QImage::Format_ARGB32);
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for(qreal s = 0; s <= backgroundImage.width(); s++)
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{
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for(qreal v = 0; v <= backgroundImage.height(); v++)
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{
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QColor penColor = getColor(qreal(int(s/rect.width()*360)), 1, 1);
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backgroundImage.setPixelColor(std::min(int(s), rect.width() - 1), backgroundImage.height() - int(v), penColor);
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}
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}
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painter.drawImage(QRect(rect.x(), rect.y() + 2, rect.width(), rect.height() - spacing), backgroundImage);
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QPen borderPen;
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borderPen.setWidth(1);
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borderPen.setColor(QColor(0, 0, 0, 26));
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painter.setPen(borderPen);
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painter.drawRect(QRect(rect.x(), rect.y() + 3, rect.width() - 2, rect.height() - spacing - 2));
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QSlider::paintEvent(ev);
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}
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