4.5 (4)

4.5 (4)

#### Overview of this book

In this first-of-its-kind TikZ book, you’ll embark on a journey to discover the fascinating realm of TikZ—what it’s about, the philosophy behind it, and what sets it apart from other graphics libraries. From installation procedures to the intricacies of its syntax, this comprehensive guide will help you use TikZ to create flawless graphics to captivate your audience in theses, articles, or books. You’ll learn all the details starting with drawing nodes, edges, and arrows and arranging them with perfect alignment. As you explore advanced features, you’ll gain proficiency in using colors and transparency for filling and shading, and clipping image parts. You’ll learn to define TikZ styles and work with coordinate calculations and transformations. That’s not all! You’ll work with layers, overlays, absolute positioning, and adding special decorations and take it a step further using add-on packages for drawing diagrams, charts, and plots. By the end of this TikZ book, you’ll have mastered the finer details of image creation, enabling you to achieve visually stunning graphics with great precision.
Chapter 1: Getting Started with TikZ
Free Chapter
Chapter 2: Creating the First TikZ Images
Chapter 3: Drawing and Positioning Nodes
Chapter 4: Drawing Edges and Arrows
Chapter 5: Using Styles and Pics
Chapter 6: Drawing Trees and Graphs
Chapter 7: Filling, Clipping, and Shading
Chapter 8: Decorating Paths
Chapter 9: Using Layers, Overlays, and Transparency
Chapter 10: Calculating with Coordinates and Paths
Chapter 11: Transforming Coordinates and Canvas
Chapter 12: Drawing Smooth Curves
Chapter 13: Plotting in 2D and 3D
Chapter 14: Drawing Diagrams
Chapter 15: Having Fun with TikZ
Index
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# Using colors

We can add colors as options to \draw, as we did for Figure 2.3 when we added blue lines. When we look at circles, ellipses, and rectangles, we can see that the element can have one color while the inner area can have another color. We can add the latter using the fill option.

It’s easier to see it with an example – to draw a blue circle filled with yellow. For this, we can write the following:

\draw[blue,fill=yellow] (0,0) circle [radius=2];

Let’s now fill colors in Figure 2.9. We’ll use fill=yellow for the circle, fill=black for the ellipses, and make the arc thicker by using very thick. Also, let’s omit the rectangle. Our commands are as follows, in a complete document, with the changes highlighted:

\documentclass[tikz,border=10pt]{standalone}
\begin{document}
\begin{tikzpicture}
\draw[fill=black] (-0.5,0.5,0)
\draw[fill=black] (0.5,0.5,0)
\draw[very thick] (-1,-1) arc [start angle=185,
\end{tikzpicture}
\end{document}

When we compile this document, we get the following:

Figure 2.10 – A smiley with color

TikZ has another way of filling called shading. Instead of filling with a uniform color, shading fills an area with a smooth transition between colors. For our smiley, we chose a predefined ball shading that gives a three-dimensional impression. We set the shading=ball and ball color=yellow options for the face, and ball color=black for the eyes. The code becomes the following:

\draw[shading=ball, ball color=yellow] (0,0)
end angle=355, x radius=1, y radius=0.5];