I see from https://vega.github.io/vega-lite/docs/config.html that it is possible to change the background color. But i don't see any docs for adding an underlay background image.
vega-lite creates a canvas element.
So adding a background image is explained in a question about how to add a background to a canvas element.
HTML5 Canvas background image
But you can just do it with css:
canvas {
background: url("my_background.png");
}
This is just like any other background image css.
https://developer.mozilla.org/en-US/docs/Web/CSS/background-image
I'm exporting a Fabricjs egText to PDF on Node server using PDFKit module.
It auto adds a border around my text when export to PDF.
On drawing canvas: On drawing canvas img
On PDF: On PDF img
As you see, it has a very light border around text.
And if I set the backgroundColor of text to rgba(255, 255, 255, 0), the border is disappear.
Do you know how to fix it or any sugguestion ?
When i add a white blackground rectangle under the text, the border is disappear on the part of text that on the rectangle, at the rest, the border still active.
The image here: Two parts of text Img
I am trying to use mask on my QWidget. I want to overlay existing widget with row of buttons - similar to Skype
Notice that these buttons don't have jagged edges - they are nicely antialiased and widget below them is still visible.
I tried to accomplish that using Qt Stylesheets but on pixels that should be "masked out" was just black colour - it was round button on black, rectangular background.
Then I tried to do this using QWidget::mask(). I used following code
QImage alpha_mask(QSize(50, 50), QImage::Format_ARGB32);
alpha_mask.fill(Qt::transparent);
QPainter painter(&alpha_mask);
painter.setBrush(Qt::black);
painter.setRenderHint(QPainter::Antialiasing);
painter.drawEllipse(QPoint(25,25), 24, 24);
QPixmap mask = QPixmap::fromImage(alpha_mask);
widget.setMask(mask.mask());
Sadly, it results in following effect
"Edges" are jagged, where they should be smooth. I saved generated mask so I could investigate if it was the problem
it wasn't.
I know that Linux version of Skype does use Qt so it should be possible to reproduce. But how?
One possible approach I see is the following.
Prepare a nice high resolution pixmap with the circular button icon over transparent background.
Paint the pixmap on a square widget.
Then mask the widget leaving just a little bit of margin beyond the border of the circular icon so that the widget mask jaggedness won't touch the smooth border of the icon.
I managed to get a nice circular button with not so much code.
Here is the constructor of my custom button:
Button::Button(Type t, QWidget *parent) : QPushButton(parent) {
setIcon(getIcon(t));
resize(30,30);
setMouseTracking(true);
// here I apply a centered mask and 2 pixels bigger than the button
setMask(QRegion(QRect(-1,-1,32,32),QRegion::Ellipse));
}
and in the style sheet I have the following:
Button {
border-radius: 15px;
background-color: rgb(136, 0, 170);
}
With border-radius I get the visual circle and the mask doesn't corrupt the edges because it is 1 pixel away.
You are using the wrong approach for generating masks. I would generate them from the button images themselves:
QImage image(widget.size(), QImage::Format_Alpha8);
widget.render(&image);
widget.setMask(QBitmap::fromImage(image.createMaskFromColor(qRgba(0, 0, 0, 0))));
I have the following code in my PyGTK application:
scroll = gtk.ScrolledWindow()
scroll.set_policy(gtk.POLICY_NEVER, gtk.POLICY_AUTOMATIC)
scroll.modify_bg(gtk.STATE_NORMAL,gtk.gdk.Color("#FFFFFF"))
scroll.add_with_viewport(self.movieView)
layout = gtk.VBox()
layout.pack_start(top,False,False)
layout.pack_start(scroll)
But the background of the scroll area still shows up gray, instead of white
Is this a known bug, or am I doing something wrong?
I have Button image with Rounded Button image. I am tiling image to get bigger button in QML . I am using parent as rectangle and image as BorderImage. After tiling I am getting rectangle on top image is visible. I need to remove the part of the rectangle so that only rounded button image (Has transparency) is Visible. Even i need to change the color of the behind rectangle so that Color animation is possible.
Please suggest efficient method to remove the behind rectangle and provide the color animation also.
I am attaching the Rounded button border image as attachment and source code for tiling the button image.
Rectangle{
id:outerBorderRect
smooth:true
anchors.fill:parent
//opacity:.25
//border.width:0
BorderImage{
id:innerBorderRect
smooth:true
anchors.fill:parent
border{left:20;top:16;right:17;bottom:20}
horizontalTileMode:BorderImage.Round
verticalTileMode:BorderImage.Round
source:"button_3.png"
}
}
A simple and semi-hack way to do this is to use the radius property in Rectangle to hide the corners of your button.
Or you could use a proper mask by using Qt's OpacityMask.
I'm not sure what kind of animation you're looking for. You'll have to provide more details for me to answer that part.