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The details of how to use the graphics effects are all well documented in the Qt API documentation. These classes can be used to implement effects on widgets and Graphics View items but are unrelated to the QML Graphical Effects module.
There are C++ classes in QtWidgets that all derive from QGraphicsEffect: QGraphicsBlurEffect, QGraphicsColorizeEffect, QGraphicsDropShadowEffect and QGraphicsOpacityEffect. While in some cases you might want to implement effects in C++ or using OpenGL shaders, using the QML components is much simpler if the effect you want is available.Ĭurrently there is no C++ API it is purely a set of QML components. Much more can be done by combining effects and using animation. The Graphical Effects components in Qt 5 can be useful for producing different visual effects.
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The code for all of them is very similar and can be downloaded from here. Here are a couple of screen shots showing the application running with different slider positions:Īs I was writing this blog post I developed a number of examples to demonstrate more of the effects.
The two sliders control the effect's contrast and brightness properties. The effect operates on an Image which is not visible. The interesting parts of the code related to the effect are highlighted. Text : qsTr ( "Brightness/Contrast Effect" ) It ranges from zero (no blurring) to an infinite value (in practice 64 pixels is about the maximum you would want to use).Īnchors. The Fastblur effect has a radius property which defines the distance in neighboring pixels over which to perform the blurring. The effect operates on the source (by referencing it's id property). The source is an Image which uses a file as a source. We use a FastBlur effect to operate on an image. Here is a simple example taken straight from the Qt documentation. There are no special platform requirements beyond OpenGL 2.0 or OpenGL ES 2.0 support which is required to run Qt Quick 2. A future blog posting may go into more detail on how to use shaders from QML. The effects are implemented entirely in QML and most of them use OpenGL vertex and fragment shaders, so much of the processing is performed on the GPU. As is usual with QML these properties can be controlled by animations if desired. The effects have a number of properties to control the generated output. The source items for most effects can be any QML type including a video or another effect. Some effects don't need to use a source image (like the gradients) or can combine two images (like Blend). If the effect is anchored to the source image that it operates on it needs to be either a child or a sibling of the source image. Often it is convenient to overlay the effect on the original image. The effect itself will show the image that was modified by the effect. Typically the effects operate on a source image which should be hidden. To use an effect declare the desired effect component and configure it's properties. To use Qt Graphical Effects start by putting the following import statement in your QML program: Masks the source item with another item and applies a threshold value. Generates a blurred and colorized rectangle, which gives the impression that the source is glowing. Generates a blurred and colorized image of the source and places it behind the original, giving impression that the source is glowing. Generates a colorized and blurred shadow inside the source.Īpplies a fast blur effect to one or more source items.Īpplies a blur effect with a varying intensity.īlurs repeatedly, providing a strong blur effect.Īpplies blur effect to the specified direction.Īpplies directional blur in a circular direction around the item's center point.Īpplies directional blur effect towards source item's center point. Generates a colorized and blurred shadow image of the source and places it behind the original, giving the impression that source item is raised from the background. Moves the pixels of the source item according to the given displacement map. Merges two source items by using a blend mode.Īlters the colors of the source item by applying an overlay color.Īlters the source item colors in the HSL color space.Īdjusts color levels in the RGBA color space.
Here is the list of effects provided as of Qt 5.1: Effect As of Qt 5.1 the module offers 25 QML components which support effects in these categories: blend, color, gradient, distortion, drop shadow, blur, motion blur, glow and mask. This blog posting gives an introduction to the Qt Graphical Effects module which is available in Qt 5.