Mastering GUI Programming with Python

Drawing with QImage

Now that our GUI is squared away, it's time to create MainView.build_image(). This method will contain all of the image manipulation and painting methods.

We'll begin by adding the following code:

    def build_image(self, data):        if not data.get('image_source'):            self.image.fill(qtg.QColor('black'))        else:            self.image.load(data.get('image_source'))            if not (self.max_size - self.image.size()).isValid():                # isValid returns false if either dimension is negative                self.image = self.image.scaled(                    self.max_size, qtc.Qt.KeepAspectRatio)

Our first task is to set up the base image of our meme. If we don't have an image_source value in the form data, then we'll just fill our QImage object with the color black, providing us a blank canvas ...