[英]QPainter break coordinate system in OpenGl
我想通過單擊選擇對象上的點
成功實現
this->camera()->convertClickToLine(point, orig, dir);
bool found;
selectedPoint = this->camera()->pointUnderPixel(point, found);
if (selectedName() >= 0) {
glColor3f(0.9f, 0.2f, 0.1f);
glBegin(GL_POINTS);
glVertex3f(selectedPoint.x, selectedPoint.y, selectedPoint.z);
glEnd();
}
可選對象的示例:
glBegin(GL_TRIANGLES);
glColor3f(0.5,0,0);
glVertex3f(xmin,ymin,zmin);
glVertex3f(xmin + (xmax-xmin)/2,ymin+(ymax-ymin)/2, zmin+(zmax-zmin)/2);
glVertex3f(xmax,ymin,zmin);
glEnd();
但是,如果我開始使用QPainter,selectedPoint將坐標更改為錯誤
QPainter painter(this);
painter.setPen(Qt::black);
painter.setFont(QFont("Helvetica", 8));
painter.setRenderHints(QPainter::Antialiasing | QPainter::TextAntialiasing);
painter.drawText(textPosX + 10, textPosY, text);
painter.setBrush(QBrush(Qt::black, Qt::SolidPattern));
painter.drawEllipse(QPoint(textPosX, textPosY), 2, 2);
painter.end();
我該怎么辦?
我的步驟:
我通過OpenGl繪制盒子和對象
我通過Qpainter繪制對象名稱
我通過單擊在對象上畫點(由於上一個項目而無效,如果我評論項目2,則一切正常)
解決了
glPushAttrib(GL_ALL_ATTRIB_BITS);
glMatrixMode(GL_PROJECTION);
glPushMatrix();
glMatrixMode(GL_MODELVIEW);
glPushMatrix();
/ QPainter /
glMatrixMode(GL_MODELVIEW);
glPopMatrix();
glMatrixMode(GL_PROJECTION);
glPopMatrix();
glPopAttrib();
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