I have a qt label which by default has a place holder image in it:
self.label.setPixmap(QtGui.QPixmap(_fromUtf8("place_holder.jpg")))
There is a function to update the image contained in the label which is:
def selectFile(self):
image = QtGui.QFileDialog.getOpenFileName(None, 'Select Reference Image', '', '*.jpg')
self.label.setPixmap(QtGui.QPixmap(_fromUtf8(image)))
This works fine (the image is updated), but it is also deformed if the image used to update the label has different size from the place holder image.
Is there any way to fix this? I mean to adapt the image and to keep fix the size of the label?
You can try to set the scaledContents property:
self.label.setScaledContents(True)
self.label.setPixmap(QPixmap("your_image.jpeg"))
It works fine for me.
Beware that this scale the image to fill all available space. It means that the aspect ratio of the image wont be preserved unless the label size and the image have the same aspect ratio. You will have the same problem using the QPixmap.scale method as you can see in the images here.
Scale the image each time you import it. If you already have a size in mind for your label, you can even scale the place holder.
try (c++)
//initial setup
QPixmap pixPlaceHolder = QPixmap(_fromUtf8("place_holder.jpg");
QSize desiredsize = pixPlaceHolder.size(); // or any of the size you want
Each time you select a file:
label.setPixmap(QPixmap(_fromUtf8(image).scaled(desiredsize));
try this, this helped me for scaling the image to fit the label while maintaining the aspect ratio. Will also help to resize the image based on the label size.
pixmap = QPixmap(x)
pixmap = pixmap.scaled(self.label.size().width(),self.ui.label_4.size().height(), Qt.KeepAspectRatio)
self.label.setPixmap(QPixmap(pixmap))
Related
I am displaying an image and then using a marker on it.
the problem is that when the screen size is altered. the marker also changes its position, why is this happening? and how can I fix this so that the marker stays on the same position relative to the image.
here's the link -> https://codesandbox.io/s/34x4lrovmm
Actually, there are many ways to do that here's one of them.
You need just to set static width and height for image
I can't quite figure out what the best way of displaying an image is in my particular case, so hopefully someone on here has a few tips.
I want to display an image that gets re-sized automatically to fit inside the space that is available. I currently do this by creating a class derived from QLabel that implements void resizeEvent(QResizeEvent*) where I do a QPixmap::scaled to re-size the image. The problem is that this only works when the widget is enlarged because the widget doesn't get a resizeEvent when I try to make the widget smaller. I guess that because I set the image to the same size as the widget, it isn't allowed to be sized smaller again? I guess I could try to create a smaller image therefor introducing a sort of "border" around the image which would perhaps allow re-size events to occur when making the area smaller. Any thoughts?
resizeEvent is sent whenever size is changed. It doesn't matter whether it is enlarged or not.
But you can set Policy and Max/Min size to constraint widget in shrinking/enlarging. So if you have your widget not getting resizeEvent AND it doesn't shrink either, then look at your size policy and min width/height. If it shrinks but you doesn't have resizeEvent then you have some error in you logic, I believe.
Alternatively you can use paintEvent for image painting and use QWidget::rect() for your widget width/height.
Try changing the size policy of the label to QSizePolicy::Preferred.
Have a look at size policies in general.
I am wondering if it is possible to shrink an image widget down to a size that is smaller than the image resource itself. I have tried the following:
imageResource.setSize(size, size);
imageResource.setPixelSize(size, size);
I have also tried re-sizing in the CSS file. But when I size the image to smaller than the original, it just crops it down and doesn't actually shrink it. It seems to me the solution is to use a high resolution, smaller image that I can scale up if need be, but I feel like I'm missing something here.
You can use CSS3 background-size property to scale the image:
http://www.w3schools.com/cssref/css3_pr_background-size.asp
Note that it's not supported in some very old browsers.
You can also try with,
ImageResorce myImage = new ImageResource();
myImage.getElement().setAttribute("height","20px");
myImage.getElement().setAttribute("width","20px");
cheers !!!
I want to set pixmap to my QLabel. Problem is , not whole image is displayed in the label, i.e only small part of the image is displayed. Here is the code :
QPixmap pix("c:\\images\\myimg.png"));
mLabel->setPixmap(pix);
What can be the problem
Try setting pixmap size to label size
mLabel->setFixedSize(pix.size());
If you want to keep aspect ratio of the image you must do that:
QPixmap pix("c:\\images\\myimg.png");
pix = pix.scaled(QSize(mLabel->width(),mLabel->height()), Qt::KeepAspectRatio);
mLabel->resize(pix.size());
mLabel->setPixmap(pix);
If you don't want to keep aspect ratio of the image you must do that:
QPixmap pix("c:\\images\\myimg.png");
pix = pix.scaled(QSize(mLabel->width(),mLabel->height()), Qt::IgnoreAspectRatio);
mLabel->setPixmap(pix);
The Label was not added in layout. After adding it, it works.
Here's my problem, I need to scale and clip images into square sized tiles to put into a tile list. Here's how I want it to work:
I want all my tiles to be, say, 300px x 300px.
For each image, I want to scale the shorter side (either width or height) to fit in the tile using the "letterbox" scaleMode (so that it maintains aspect ratio).
Then I want to position the image in the center and clip away anything left over from either both sides or the top and bottom.
Here's an example to help clarify:
I have an image with width=600px and height=1200px. First I want to scale the image to width=300px and height=600px (notice that aspect ratio is maintained), then center the image vertically and clip the image to 300 x 300.
Is this possible? This is actually a pretty standard way of displaying square thumbnails in many photo-based web sites, but I can't find a way to make it work in flex.
Any help would be appreciated, thanks!
UPDATE JUNE 2012:
Just in case anyone finds this thread now, this issue has been resolved in the latest version of the Flex SDK. On the spark image object there is a new scaleMode of "zoom" which does exactly what I've asked for here.
Take your big image and draw it on BitmapData with scale and reposition:
const zoom:Number = Math.max(THUMB_WIDTH/image.width, THUMB_HEIGHT/image.height);
const x:int = (THUMB_WIDTH - image.width*zoom)/2;
const y:int = (THUMB_HEIGHT - image.height*zoom)/2;
var matrix:Matrix = new Matrix;
matrix.scale(zoom, zoom);
matrix.translate(x, y);
var _thumbBitmap:BitmapData = new BitmapData(THUMB_WIDTH, THUMB_HEIGHT, false, 0xFFFFFF);
_thumbBitmap.draw(image, matrix, null, null, null, true);
Then assign resulting BitmapData to the source of the BitmapImage.
More: http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/flash/display/BitmapData.html#draw%28%29
http://help.adobe.com/en_US/FlashPlatform/reference/actionscript/3/spark/primitives/BitmapImage.html#source