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/****************************************************************************
**
** Copyright (C) 2014 Digia Plc
** All rights reserved.
** For any questions to Digia, please use contact form at http://qt.digia.com
**
** This file is part of the QtDataVisualization module.
**
** Licensees holding valid Qt Enterprise licenses may use this file in
** accordance with the Qt Enterprise License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia.
**
** If you have questions regarding the use of this file, please use
** contact form at http://qt.digia.com
**
****************************************************************************/
#include "utils_p.h"
#include <QtGui/QColor>
#include <QtGui/QPainter>
#include <QtCore/QPoint>
#include <QtGui/QImage>
#include <QtCore/QRegExp>
#include <QtCore/qmath.h>
QT_BEGIN_NAMESPACE_DATAVISUALIZATION
#define NUM_IN_POWER(y, x) for (;y<x;y<<=1)
#define MIN_POWER 2
GLuint Utils::getNearestPowerOfTwo(GLuint value, GLuint &padding)
{
GLuint powOfTwoValue = MIN_POWER;
NUM_IN_POWER(powOfTwoValue, value);
padding = powOfTwoValue - value;
return powOfTwoValue;
}
QVector4D Utils::vectorFromColor(const QColor &color)
{
return QVector4D(color.redF(), color.greenF(), color.blueF(), color.alphaF());
}
QColor Utils::colorFromVector(const QVector3D &colorVector)
{
return QColor(colorVector.x() * 255.0f, colorVector.y() * 255.0f,
colorVector.z() * 255.0f, 255.0f);
}
QColor Utils::colorFromVector(const QVector4D &colorVector)
{
return QColor(colorVector.x() * 255.0f, colorVector.y() * 255.0f,
colorVector.z() * 255.0f, colorVector.w() * 255.0f);
}
QImage Utils::printTextToImage(const QFont &font, const QString &text, const QColor &bgrColor,
const QColor &txtColor, bool labelBackground,
bool borders, int maxLabelWidth)
{
GLuint paddingWidth = 20;
GLuint paddingHeight = 20;
// Calculate text dimensions
QFont valueFont = font;
valueFont.setPointSize(textureFontSize);
QFontMetrics valueFM(valueFont);
int valueStrWidth = valueFM.width(text);
if (maxLabelWidth && labelBackground)
valueStrWidth = maxLabelWidth;
int valueStrHeight = valueFM.height();
valueStrWidth += paddingWidth / 2; // Fix clipping problem with skewed fonts (italic or italic-style)
QSize labelSize;
#if defined(Q_OS_ANDROID) || defined(Q_OS_IOS)
// Android can't handle textures with dimensions not in power of 2. Resize labels accordingly.
// Add some padding before converting to power of two to avoid too tight fit
GLuint prePadding = 5;
// Android needs to use this always (when given) because of the power of 2 -issue.
if (maxLabelWidth)
valueStrWidth = maxLabelWidth + paddingWidth / 2;
labelSize = QSize(valueStrWidth + prePadding, valueStrHeight + prePadding);
labelSize.setWidth(getNearestPowerOfTwo(labelSize.width(), paddingWidth));
labelSize.setHeight(getNearestPowerOfTwo(labelSize.height(), paddingHeight));
#else
if (!labelBackground)
labelSize = QSize(valueStrWidth, valueStrHeight);
else
labelSize = QSize(valueStrWidth + paddingWidth * 2, valueStrHeight + paddingHeight * 2);
#endif
// Create image
QImage image = QImage(labelSize, QImage::Format_ARGB32);
image.fill(Qt::transparent);
// Init painter
QPainter painter(&image);
// Paint text
painter.setRenderHint(QPainter::Antialiasing, true);
painter.setCompositionMode(QPainter::CompositionMode_Source);
painter.setFont(valueFont);
if (!labelBackground) {
painter.setPen(txtColor);
#if defined(Q_OS_ANDROID) || defined(Q_OS_IOS)
painter.drawText((labelSize.width() - valueStrWidth) / 2.0f,
(labelSize.height() - valueStrHeight) / 2.0f,
valueStrWidth, valueStrHeight,
Qt::AlignCenter | Qt::AlignVCenter,
text);
#else
painter.drawText(0, 0,
valueStrWidth, valueStrHeight,
Qt::AlignCenter | Qt::AlignVCenter,
text);
#endif
} else {
painter.setBrush(QBrush(bgrColor));
if (borders) {
painter.setPen(QPen(QBrush(txtColor), 5, Qt::SolidLine, Qt::SquareCap, Qt::RoundJoin));
painter.drawRoundedRect(5, 5, labelSize.width() - 10, labelSize.height() - 10,
10.0, 10.0);
} else {
painter.setPen(bgrColor);
painter.drawRoundedRect(0, 0, labelSize.width(), labelSize.height(), 10.0, 10.0);
}
painter.setPen(txtColor);
painter.drawText((labelSize.width() - valueStrWidth) / 2.0f,
(labelSize.height() - valueStrHeight) / 2.0f,
valueStrWidth, valueStrHeight,
Qt::AlignCenter | Qt::AlignVCenter,
text);
}
return image;
}
QVector4D Utils::getSelection(QPoint mousepos, int height)
{
// This is the only one that works with OpenGL ES 2.0, so we're forced to use it
// Item count will be limited to 256*256*256
GLubyte pixel[4] = {255, 255, 255, 255};
glReadPixels(mousepos.x(), height - mousepos.y(), 1, 1, GL_RGBA, GL_UNSIGNED_BYTE,
(void *)pixel);
QVector4D selectedColor(pixel[0], pixel[1], pixel[2], pixel[3]);
return selectedColor;
}
QImage Utils::getGradientImage(const QLinearGradient &gradient)
{
QImage image(QSize(1, 101), QImage::Format_RGB32);
QPainter pmp(&image);
pmp.setBrush(QBrush(gradient));
pmp.setPen(Qt::NoPen);
pmp.drawRect(0, 0, 1, 101);
return image;
}
Utils::ParamType Utils::mapFormatCharToParamType(const QChar &formatChar)
{
ParamType retVal = ParamTypeUnknown;
if (formatChar == QLatin1Char('d')
|| formatChar == QLatin1Char('i')
|| formatChar == QLatin1Char('c')) {
retVal = ParamTypeInt;
} else if (formatChar == QLatin1Char('u')
|| formatChar == QLatin1Char('o')
|| formatChar == QLatin1Char('x')
|| formatChar == QLatin1Char('X')) {
retVal = ParamTypeUInt;
} else if (formatChar == QLatin1Char('f')
|| formatChar == QLatin1Char('F')
|| formatChar == QLatin1Char('e')
|| formatChar == QLatin1Char('E')
|| formatChar == QLatin1Char('g')
|| formatChar == QLatin1Char('G')) {
retVal = ParamTypeReal;
}
return retVal;
}
Utils::ParamType Utils::findFormatParamType(const QString &format)
{
static QRegExp formatMatcher(QStringLiteral("%[\\-\\+#\\s\\d\\.lhjztL]*([dicuoxfegXFEG])"));
if (formatMatcher.indexIn(format, 0) != -1) {
QString capStr = formatMatcher.cap(1);
if (capStr.isEmpty())
return ParamTypeUnknown;
else
return mapFormatCharToParamType(capStr.at(0));
}
return ParamTypeUnknown;
}
QString Utils::formatLabel(const QByteArray &format, ParamType paramType, qreal value)
{
switch (paramType) {
case ParamTypeInt:
return QString().sprintf(format, (qint64)value);
case ParamTypeUInt:
return QString().sprintf(format, (quint64)value);
case ParamTypeReal:
return QString().sprintf(format, value);
default:
return QString::fromUtf8(format); // To detect errors
}
}
QString Utils::defaultLabelFormat()
{
static const QString defaultFormat(QStringLiteral("%.2f"));
return defaultFormat;
}
float Utils::wrapValue(float value, float min, float max)
{
if (value > max) {
value = min + (value - max);
// In case single wrap fails, jump to opposite end.
if (value > max)
value = min;
}
if (value < min) {
value = max + (value - min);
// In case single wrap fails, jump to opposite end.
if (value < min)
value = max;
}
return value;
}
QT_END_NAMESPACE_DATAVISUALIZATION
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