![]() To make this easy to demonstrate we'll be using the following stub application which handles creating our container (a QLabel), creating a pixmap canvas, displaying that in the container and adding the container to the main window.įrom PyQt5 import QtCore, QtGui, QtWidgets, uic This is a generic interface which can be used to draw on various surfaces including, for example, QPixmap. We'll go through some basic drawing operations and finally put it all together to create our own little Paint app.īitmap drawing operations in Qt are handled through the QPainter class. In this tutorial we'll take a look at QPainter - Qt's API for performing bitmap graphic operations and the basis for drawing your own widgets. Contrast with vector graphics, where the image is stored as a series of drawing instructions which are repeated to form the image. Once you understand how this works you can draw any widget you like!Ī bitmap is a rectangular grids of pixels, where each pixel is stored individually as a number of bits. All standard widgets draw themselves as bitmaps on a rectangular "canvas" that forms the shape of the widget. This allows for photo realistic images and renderings.įractal graphics is a graphics which uses fractals- typically self-similar patterns, where self-similar means they are "the same from near as from far". Fractal graphics is used to generate random landscapes and geographical maps. The best-known figures of the fractal are Koch snowflake, Mandelbrot set, Cantor set and Sierpinski carpet. There are many programs designed to create fractal images, such as Gimp, Fractint, Ultra Fractal or FractalExplorer.The first step towards creating custom widgets in PyQt5 is understanding bitmap (pixel-based) graphic operations. from a 3-D perspective, rendering shadows is also much more realistic with vector graphics, as shadows can be abstracted into the rays of light from which they are formed. ![]() Moreover, it is usual to specify the dimensions in device-independent units, which results in the best possible rasterization on raster device, doesn’t degrade the quality of a drawing. This means that moving, scaling, rotating, filling etc. the parameters of objects are stored and can be later modified.However, irregular curves represented by simple geometric shapes may be made proportionally wider when zooming in, to keep them looking smooth and not like these geometric shapes. This problem disappears in fractal graphics, Often the width is either not increased or less than proportional. on zooming in, lines and curves need not get wider proportionally.On the other hand, a polygon representing a curve will reveal being not really curved, ![]()
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