By Roberto Ulloa

Mobiles and capsules have introduced with them a dramatic switch within the application of purposes. Compatibility has develop into crucial, and this has elevated the type of interplay that clients count on: gestures, multi-touches, animations, and magic pens. Kivy is an open resource Python resolution that covers those industry wishes with an easy-to-learn and speedy improvement procedure. Kivy is growing to be quickly and gaining cognizance in its place to the confirmed constructing platforms.

Kivy: Interactive purposes in Python fast introduces you to the Kivy improvement technique. you'll study a few examples of ways to take advantage of some of the Kivy elements, in addition to know the way to combine and mix them into great initiatives. This publication serves as a reference advisor and is equipped in the sort of manner that when accomplished, you might have already accomplished your first undertaking.

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Additional resources for Kivy: Interactive Applications in Python

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Canvas: 67. Ellipse: 68. pos: 10,10 69. size: 80,80 70. png' 71. Rectangle: 72. pos: 110,10 73. size: 80,80 74. png' 75. Color: 76. 75 77. Line: 78. points: 10,10,390,10 79. width: 10 80. cap: 'square' 81. Color: 82. rgba: 0,1,0,1 83. info Chapter 2 84. 85. 86. 87. 88. 89. png' Rectangle: pos: 310,10 size: 80,80 This code starts with an Ellipse (line 67) and a Rectangle (line 71). We use the source property, which inserts an image to decorate the polygon. png is 80 x 80 pixels with a white background (without any alpha/transparency channel).

The solution is that the way we implemented the ToolButton follows the way RelativeLayout is implemented. after of the Stickman class. The instructions in lines 196 to 199 are added after the PopMatrix. Therefore, the context is restored correctly on the PushMatrix. before because they are added after the existents instructions. In other words, if we were to add them in the canvas, the StickMan would be drawn before the translation and scaling. kv files, so we are not presenting them again. The context and vertex instructions are easy to understand.

This is why you can still see the Kivy logo on the background instead of it being all covered by the color. There is another important detail to notice in the previous screenshot. There is a blue line that crosses the first two polygons in front and then crosses behind the last two. This illustrates the fact that the instructions are executed in order and this might bring some unwanted results. In this example we have full control of the order but for more complicated scenarios Kivy provides an alternative.

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