Painter | 小程序生成图片库，轻松通过 json 方式绘制一张可以发到朋友圈的图片 | JSON Processing library

I want to change the default tab widget close button and set my icon instead. The problem is that it draws the icon on the text. I want to draw the X to the right.

Code:

I'm looking for a solution, to animate this arc from 0 - 360°. I'm relative new to Pyside/Pyqt and I don't find such a simple solution (only beginner "unfriedly"). I tried it with while loops aswell, but it doesn't works. At the moment I don't understand this animation system, but I want to work on it.

I am looking to round the corners of an image drawn on the canvas.

My end result should look like this below image. An image with rounded corners and drop shadow, I have managed to add the drop shadow.

Here's my painter code so far.

My goal is to draw figures onto images and save to file. In this simplified example, I prepare an image for QPainter and then draw a rectangle via drawRect to the existing image and save to a file. The resultant image shows the combined image but the rectangle shows rounded edges instead of sharp edges. How to fix it? Your help is appreciated.

I have a QPaintEvent override for a custom widget that has a fixed size set. This fixed size can change per instance but in this simple example, ive set it. however the PaintEvent doesn't take it into account so when the users scrolls to the right the rectangle shouldn't paint rounded corners since the widget extends past the visible viewport. How do i fix this?

Full widget painted correctly...

When i resize dialog and scroll right, you'll see rounded corners appear on the left side... when it should NOT.

They should look like this...

Code

I am trying to make a Composable which I can ruse by passing image of any size to fill its Width by using

I am writing a whiteboard application in QT. I am using a double layer approach, so I have a QPixmap that contains the drawing, and another that contains the background. The drawing pixmap is, unsurprisingly, with an alpha channel.

Now I wish to implement an eraser tool. This tool should revert, wherever it paints, the pixmap's color to QColor(255, 255, 255, 0) (i.e. - totally transparent). My method of painting, however, does not lend well to that.

This is my draw routine:

In my QT application I'm drawing lots of polygons like this:

I'm animating these, so some polygons will receive a new color. This animation runs 4-5 times per second.

However, calling the paintEvent() of the Qt.Painter() 4-5 times/second redraws ALL polygons which results in performance issues. Its only updated once a second, which is too slow. As you may see in the picture below, only some polygons in the first 12 rows needs to be updated:

In the QT docs I have read that you can't really save the state of the things you've already drawn. So you have to redraw everything again. Am I missing something? Is there a trick to still achieve this?

This is what my paintEvent() basically looks like (simplified, reduced cyclomatic complexity)

I'm trying to style my application though a QProxyStyle.

I create a StyleCustom class which override drawControl to draw my tabs in red or green depending on the tab state, and add the text on top of it.

However, using option.text gives me the following error :