你好,我在保存像素图时遇到了一个奇怪的问题。
我的小部件标题
public:
QPixmap *base; //Base Poses
QPixmap *Hair; //Hair
QPixmap *Composited; //Final Composition
bool compisition = false;
void Composite();
我的小部件 Cpp
在绘画事件中
base = &pic;
Hair = &hairs;
if(compisition)
{
QPixmap pix(128,192);
QPainter *p = new QPainter(&pix);
p->drawPixmap(0,0,128,192,*base);
p->drawPixmap(0,0,128,192,*Hair);
Composited = &pix;
compisition = false;
}
void AnimPreview::Composite()
{
compisition = true;
this->update();
}
在主窗体源
void MainWindow::on_commandLinkButton_clicked()
{
QString file = QFileDialog::getSaveFileName(this,
tr("Save Sprite file"),
"",tr("File PNG (*.png)"));
const QPixmap *pix = ui->SpriteFront->pixmap();
if(!file.isEmpty())
{
QFile files(file);
files.open(QIODevice::WriteOnly);
ui->SpriteFront->Composite();
ui->SpriteFront->Composited->save(&files,"PNG");
}
}
当我尝试保存文件时,该过程正常但出现错误
未处理的 win32 异常
更多信息 完整代码在这里
最佳答案
我没有检查可能会产生错误的位置,因为有许多可能的问题来源,其中包括:
您没有必要创建
QPixmap
指针,因为最终您会从内存中删除它。QPainter
也是如此,因为它只需要是一个局部变量,此外绘制不会立即完成,要确保它已绘制,您必须调用它end()
方法。paintEvent
是一种 protected 方法,因此在设计上我们希望它保持这种状态。不必使用
QFile
来保存图像,您可以直接将文件名传递给它。
综上所述,我们得到:
*.h
#ifndef ANIMPREVIEW_H
#define ANIMPREVIEW_H
#include <QLabel>
#include <QPixmap>
class AnimPreview : public QLabel
{
public:
AnimPreview(QWidget *parent = 0);
void Rotate(int value);
void Composite();
void Create(int _sex, int _hair);
QPixmap Composited;
private:
int sex = 0;
int hair = 0;
bool draw = true;
int rotation = 0;
const int offsetX = 16;
const int offsetY = 32;
QPixmap base;
QPixmap Hair;
bool compisition = false;
protected:
void paintEvent(QPaintEvent *);
};
#endif // ANIMPREVIEW_H
*.cpp
#include "animpreview.h"
#include <QPainter>
AnimPreview::AnimPreview(QWidget *parent):QLabel(parent)
{
}
void AnimPreview::paintEvent(QPaintEvent *){
QPainter p(this);
QPixmap pic;
QPixmap hairs;
if(draw)
{
//Sesso
switch(sex)
{
case 0:
pic.load(":/Male/Base/Res/man_f.png");
break;
case 1:
pic.load(":/Male/Base/Res/woman_f.png");
break;
}
//capelli
if(sex == 1)
{
switch(hair)
{
case 1:
hairs.load(":/Female/Hair/Res/7_aqua.png");
break;
case 2:
hairs.load(":/Female/Hair/Res/5_gold.png");
break;
}
}
if(sex == 0)
{
switch (hair)
{
case 0:
break;
case 1:
hairs.load(":/Male/Hair/Res/1_aqua.png");
break;
case 2:
hairs.load(":/Male/Hair/Res/14_black.png");
break;
}
}
}
p.drawPixmap(width()/2 - offsetX,height()/2 - offsetY,pic,0,rotation,32,48);
p.drawPixmap(width()/2 - offsetX,height()/2 - offsetY,hairs,0,rotation,32,48);
p.drawRect(0,0, width()-1, height()-1);
base = pic;
Hair = hairs;
if(compisition)
{
QPixmap pix(128,192);
QPainter p(&pix);
p.drawPixmap(0,0,128,192, base);
p.drawPixmap(0,0,128,192, Hair);
p.end();
Composited = pix;
compisition = false;
}
}
void AnimPreview::Rotate(int value)
{
rotation = value;
update();
}
void AnimPreview::Create(int _sex, int _hair)
{
sex = _sex;
hair = _hair;
draw = true;
}
void AnimPreview::Composite()
{
compisition = true;
update();
}
void MainWindow::on_commandLinkButton_clicked()
{
QString file = QFileDialog::getSaveFileName(this,
tr("Save Sprite file"),
"",tr("File PNG (*.png)"));
if(!file.isEmpty())
{
ui->SpriteFront->Composite();
ui->SpriteFront->Composited.save(file,"PNG");
}
}
关于c++ - Qt无法保存像素图,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/49326036/