Paintbrush width control method and device based on Android

Abstract

The invention discloses a paintbrush width real-time control method based on Android. The paintbrush width real-time control method comprises the following steps of S1, capturing and recording the moving distance and interval time of a finger or a touch pen of a user in real time; S2, calculating the moving speed of the finger or the touch pen of the user; S3, converting the moving speed into thewidth of a painting brush; and S4, smoothing the handwriting by using a transition function. A speed and brush width conversion model is established through linear interpolation, and the change of thebrush tip of the writing brush is realized. Required functions can be quickly realized by using a drawing API of Android, mobile terminal equipment can be better adapted, the code readability is increased, and a mathematical model is established through linear interpolation; on basis of a speed-time model, the algorithm for converting speed and brush width is optimized,, and the change of handwriting with different thicknesses of writing brushes can be better simulated on the premise of not increasing the code complexity and the calculated amount.

Description

technical field [0001] The present invention relates to the field of Android drawing, and more specifically, to a method and device for controlling the width of a brush on Android. Background technique [0002] Controlling the thickness of the pen on the Android platform and making the strokes smoother has been applied to many commercial products, such as various input methods, various copybook software, etc. At the same time, the drawing API that comes with Android can also quickly realize the drawing function. However, in practical applications, the handwriting written by most writing software is often not obvious in thickness and is not smooth enough to be smooth and round. The drawing function implemented by canvas can't even reflect the change of handwriting thickness, and a relatively simple and cheap method can be used to solve the problem. This limitation is to use the method of calculating the width of the drawing brush in real time based on the interpolation mathem...

AI Technical Summary

Problems solved by technology

However, in practical applications, the handwriting written by most writing software is often not obvious in thickness and is not smooth enough. This limitation is to use the method of calculating the width of the drawing brush in real time based on the interpolation mathematical model and the moving speed of the user's finger

However, there are two traditional algorithms for changing the brush size: 1. The brush generation algorithm based on physical simulation. The principle is to simulate the parameters of the brush to write the font. Although the effect of calligraphy can be better simulated, there is a large amount of calculation. The real-time performance is poor, and complex parameters need to be manually set and adjusted; 2. Sample collection and generation algorithms based on machine learning, the basic idea of ​​​​this type of algorithm is to use machine learning to search for sample fonts similar to the user's handwriting in a large number of data samples, and then draw on the drawing board , but there is also a large amount of calculation and the operation of constructing the neural network and the training sample set is relatively complicated, and the time requirement is large

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