Hello,
I want to draw a QImage based off of a PNG file.
It compiles fine, but it doesn't show my PNG file.
Here's the piece of code I use:
The .h
#ifndef DRAWINGMAP_H
#define DRAWINGMAP_H
#include <QtGui/QWidget>
#include "ui_drawingmap.h"
#include <QtCore/QList>
#include <QtGui/QImage>
struct myPos2D
{
int x;
int y;
int yaw;
};
{
Q_OBJECT
public:
~DrawingMap();
public slots:
void setPos(int x , int y , int yaw);
void setRobotDiameter(int diameter);
protected:
private:
Ui::DrawingMapClass ui;
int x_pos, y_pos, yaw;
int robotDiameter;
int zoom;
QList<myPos2D> positionList;
};
#endif // DRAWINGMAP_H
#ifndef DRAWINGMAP_H
#define DRAWINGMAP_H
#include <QtGui/QWidget>
#include "ui_drawingmap.h"
#include <QtCore/QList>
#include <QtGui/QImage>
struct myPos2D
{
int x;
int y;
int yaw;
};
class DrawingMap : public QWidget
{
Q_OBJECT
public:
DrawingMap(QWidget *parent = 0);
~DrawingMap();
public slots:
void setPos(int x , int y , int yaw);
void setRobotDiameter(int diameter);
protected:
void paintEvent(QPaintEvent *event);
private:
Ui::DrawingMapClass ui;
int x_pos, y_pos, yaw;
int robotDiameter;
int zoom;
QImage robotImage;
QList<myPos2D> positionList;
};
#endif // DRAWINGMAP_H
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The .cpp
#include "drawingmap.h"
#include <QtGui/QPainter>
DrawingMap
::DrawingMap(QWidget *parent
){
x_pos = y_pos = yaw = 0;
robotDiameter = 10;
zoom = 1;
ui.setupUi(this);
}
DrawingMap::~DrawingMap()
{
}
{
myPos2D newPos; //this is a struct with int x, int y, int yaw
newPos.x = x_pos;
newPos.y = y_pos;
newPos.yaw = yaw;
int oldX = 0, oldY = 0;
positionList.append(newPos); //This is a QList
painter.setPen(Qt::SolidLine);
painter.setPen(Qt::red);
painter.translate(rect().width()/2, rect().height()/2);
//draw the robot trail
for(int i = 0; i < positionList.size(); i++)
{
//draw trail
painter.drawLine(oldX * zoom , oldY * zoom, positionList.at(i).x * zoom, positionList.at(i).y * zoom);
//remember old positions
oldX = positionList.at(i).x;
oldY = positionList.at(i).y;
}
painter.setPen(Qt::NoPen);
painter.setBrush(Qt::blue);
//Get and correct image
robotImage
= QImage("myPNGfile.png");
//robotImage is a QImage robotImage.
convertToFormat(QImage::Format_ARGB32_Premultiplied ,Qt
::ColorOnly);
//robotImage.createMaskFromColor(0x00000000,Qt::MaskOutColor); // make black transparent
//Go to correct position
painter.translate(x_pos * zoom, y_pos * zoom);
painter.rotate(yaw);
//draw the robot
painter.drawImage(0 , 0 , robotImage);
/*
painter.drawPie(QRect((-robotDiameter/2) * zoom, (-robotDiameter/2) * zoom, robotDiameter * zoom, robotDiameter * zoom), 0, 360 * 16);
painter.setPen(Qt::SolidLine);
painter.drawLine(0 , 0, 0 , (robotDiameter + robotDiameter/4) * zoom );
*/
}
void DrawingMap::setPos(int x , int y , int ya)
{
x_pos = x;
y_pos = y;
yaw = ya;
update();
}
void DrawingMap::setRobotDiameter(int diameter)
{
zoom = diameter;
update();
}
#include "drawingmap.h"
#include <QtGui/QPainter>
DrawingMap::DrawingMap(QWidget *parent)
: QWidget(parent)
{
x_pos = y_pos = yaw = 0;
robotDiameter = 10;
zoom = 1;
ui.setupUi(this);
}
DrawingMap::~DrawingMap()
{
}
void DrawingMap::paintEvent(QPaintEvent * /* event */)
{
myPos2D newPos; //this is a struct with int x, int y, int yaw
newPos.x = x_pos;
newPos.y = y_pos;
newPos.yaw = yaw;
int oldX = 0, oldY = 0;
positionList.append(newPos); //This is a QList
QPainter painter(this);
painter.setPen(Qt::SolidLine);
painter.setPen(Qt::red);
painter.translate(rect().width()/2, rect().height()/2);
//draw the robot trail
for(int i = 0; i < positionList.size(); i++)
{
//draw trail
painter.drawLine(oldX * zoom , oldY * zoom, positionList.at(i).x * zoom, positionList.at(i).y * zoom);
//remember old positions
oldX = positionList.at(i).x;
oldY = positionList.at(i).y;
}
painter.setPen(Qt::NoPen);
painter.setBrush(Qt::blue);
//Get and correct image
robotImage = QImage("myPNGfile.png"); //robotImage is a QImage
robotImage.convertToFormat(QImage::Format_ARGB32_Premultiplied ,Qt::ColorOnly);
//robotImage.createMaskFromColor(0x00000000,Qt::MaskOutColor); // make black transparent
//Go to correct position
painter.translate(x_pos * zoom, y_pos * zoom);
painter.rotate(yaw);
//draw the robot
painter.drawImage(0 , 0 , robotImage);
/*
painter.drawPie(QRect((-robotDiameter/2) * zoom, (-robotDiameter/2) * zoom, robotDiameter * zoom, robotDiameter * zoom), 0, 360 * 16);
painter.setPen(Qt::SolidLine);
painter.drawLine(0 , 0, 0 , (robotDiameter + robotDiameter/4) * zoom );
*/
}
void DrawingMap::setPos(int x , int y , int ya)
{
x_pos = x;
y_pos = y;
yaw = ya;
update();
}
void DrawingMap::setRobotDiameter(int diameter)
{
zoom = diameter;
update();
}
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The .h from the .ui file Qt spit out
/********************************************************************************
** Form generated from reading ui file 'drawingmap.ui'
**
** Created: Mon Mar 2 11:22:28 2009
** by: Qt User Interface Compiler version 4.4.3
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/
#ifndef UI_DRAWINGMAP_H
#define UI_DRAWINGMAP_H
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QWidget>
QT_BEGIN_NAMESPACE
class Ui_DrawingMapClass
{
public:
void setupUi
(QWidget *DrawingMapClass
) {
if (DrawingMapClass->objectName().isEmpty())
DrawingMapClass
->setObjectName
(QString::fromUtf8("DrawingMapClass"));
DrawingMapClass->resize(400, 300);
retranslateUi(DrawingMapClass);
} // setupUi
void retranslateUi
(QWidget *DrawingMapClass
) {
DrawingMapClass
->setWindowTitle
(QApplication::translate("DrawingMapClass",
"DrawingMap",
0,
QApplication::UnicodeUTF8));
Q_UNUSED(DrawingMapClass);
} // retranslateUi
};
namespace Ui {
class DrawingMapClass: public Ui_DrawingMapClass {};
} // namespace Ui
QT_END_NAMESPACE
#endif // UI_DRAWINGMAP_H
/********************************************************************************
** Form generated from reading ui file 'drawingmap.ui'
**
** Created: Mon Mar 2 11:22:28 2009
** by: Qt User Interface Compiler version 4.4.3
**
** WARNING! All changes made in this file will be lost when recompiling ui file!
********************************************************************************/
#ifndef UI_DRAWINGMAP_H
#define UI_DRAWINGMAP_H
#include <QtCore/QVariant>
#include <QtGui/QAction>
#include <QtGui/QApplication>
#include <QtGui/QButtonGroup>
#include <QtGui/QWidget>
QT_BEGIN_NAMESPACE
class Ui_DrawingMapClass
{
public:
void setupUi(QWidget *DrawingMapClass)
{
if (DrawingMapClass->objectName().isEmpty())
DrawingMapClass->setObjectName(QString::fromUtf8("DrawingMapClass"));
DrawingMapClass->resize(400, 300);
retranslateUi(DrawingMapClass);
QMetaObject::connectSlotsByName(DrawingMapClass);
} // setupUi
void retranslateUi(QWidget *DrawingMapClass)
{
DrawingMapClass->setWindowTitle(QApplication::translate("DrawingMapClass", "DrawingMap", 0, QApplication::UnicodeUTF8));
Q_UNUSED(DrawingMapClass);
} // retranslateUi
};
namespace Ui {
class DrawingMapClass: public Ui_DrawingMapClass {};
} // namespace Ui
QT_END_NAMESPACE
#endif // UI_DRAWINGMAP_H
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The slots are used so that I can change the robot position and direction.
This QWidget is inserted in another QWidget which is the main window in my program.
I inserted my custom QWidget with Qt Designer and promoted the widget.
So it should be all standard Qt Designer code
It paints the Lines just fine.
And the very simple representation of the robot as well, that is the blue dot I commented out of the program.
QPainter doesn't seem to draw QImage
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