133 lines
3.0 KiB
C++
133 lines
3.0 KiB
C++
#include <QPainter>
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#include <QMouseEvent>
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#include <QtMath>
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#include "SVColorArea.h"
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SVColorArea::SVColorArea(QWidget *parent)
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: QWidget(parent)
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, m_iHue(0)
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, m_iSaturation(0)
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, m_iBrightness(0)
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, m_iAreaWidth(256)
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{
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createSVPixmap();
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createVPixmap();
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updateSVPixmap();
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}
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SVColorArea::~SVColorArea()
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{
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}
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void SVColorArea::setHue(int h)
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{
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m_iHue = h;
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updateSVPixmap();
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update();
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}
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void SVColorArea::setSaturation(int s)
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{
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m_iSaturation = s;
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update();
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}
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void SVColorArea::setBrightness(int v)
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{
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m_iBrightness = v;
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update();
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}
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void SVColorArea::setHsv(int h, int s, int v)
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{
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m_iHue = h;
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m_iSaturation = s;
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m_iBrightness = v;
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updateSVPixmap();
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update();
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}
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void SVColorArea::setColor(const QColor &c)
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{
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m_iHue = c.hue();
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m_iSaturation = c.saturation();
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m_iBrightness = c.value();
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updateSVPixmap();
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emit svChangedSignal(m_iHue, m_iSaturation, m_iBrightness);
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update();
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}
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void SVColorArea::paintEvent(QPaintEvent *)
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{
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//画正方形的颜色区域
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QPainter painter(this);
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painter.setRenderHint(QPainter::Antialiasing);
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painter.drawPixmap(0, 0, m_svPixmap);
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painter.drawPixmap(0, 0, m_vPixmap);
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//画颜色选取点的圆圈（亮度>128为黑色；<128为白色）
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painter.setPen(QPen(m_iBrightness > 128 ? Qt::black : Qt::white, 2));
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QPointF selecPos = QPointF(m_iSaturation, 255 - m_iBrightness);
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painter.drawEllipse(selecPos, 6, 6);
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}
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void SVColorArea::mousePressEvent(QMouseEvent *ev)
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{
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m_iSaturation = qBound(0, ev->x(), 255);
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m_iBrightness = qBound(0, 255 - ev->y(), 255);
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emit svChangedSignal(m_iHue, m_iSaturation, m_iBrightness);
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update();
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}
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void SVColorArea::mouseMoveEvent(QMouseEvent *ev)
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{
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m_iSaturation = qBound(0, ev->x(), 255);
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m_iBrightness = qBound(0, 255 - ev->y(), 255);
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emit svChangedSignal(m_iHue, m_iSaturation, m_iBrightness);
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update();
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}
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void SVColorArea::createVPixmap()
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{
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m_vPixmap = QPixmap(m_iAreaWidth, m_iAreaWidth);
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m_vPixmap.fill(Qt::transparent);
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QPainter painter(&m_vPixmap);
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painter.setRenderHint(QPainter::Antialiasing);
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painter.setCompositionMode(QPainter::CompositionMode_Source);
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QLinearGradient vGradient(0, 0, 0, m_iAreaWidth);
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vGradient.setColorAt(0, QColor(0, 0, 0, 0));
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vGradient.setColorAt(1, QColor(0, 0, 0, 255));
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painter.setPen(Qt::NoPen);
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painter.setBrush(QBrush(vGradient));
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painter.drawRect(0, 0, m_iAreaWidth, m_iAreaWidth);
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}
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void SVColorArea::createSVPixmap()
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{
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m_svPixmap = QPixmap(m_iAreaWidth, m_iAreaWidth);
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m_svPixmap.fill(Qt::transparent);
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}
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void SVColorArea::updateSVPixmap()
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{
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QColor newColor;
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newColor.setHsv(m_iHue, 255, 255);
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QPainter painter(&m_svPixmap);
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painter.setRenderHint(QPainter::Antialiasing);
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QLinearGradient svGradient(0, 0, m_iAreaWidth, 0);
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svGradient.setColorAt(1, newColor);
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svGradient.setColorAt(0, QColor("#ffffff"));
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painter.setPen(Qt::NoPen);
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painter.setBrush(QBrush(svGradient));
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painter.drawRect(0, 0, m_iAreaWidth, m_iAreaWidth);
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}
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void SVColorArea::hueChangedSlot(int h)
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{
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m_iHue = h;
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updateSVPixmap();
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emit svChangedSignal(m_iHue, m_iSaturation, m_iBrightness);
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update();
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}
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