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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Drawing geometric shapes

We want to progress from high-speed to advanced TikZ concepts, so let’s have a compact summary of what we can draw in this basic setting – that is, we start with \draw <coordinate> (that’s the current coordinate) and continue with some of the following elements:

• Line: -- (x,y) draws a line from the current coordinate to (x,y).
• Rectangle: rectangle (x,y) draws a rectangle where one corner is the current coordinate, and the opposite corner is (x,y).
• Grid: Like rectangle but with lines in between as a grid.
• Circle: circle (r) was a short syntax we used previously, but the extended syntax is circle [radius=r], which draws a circle with the center at the current coordinate and a radius of r.
• Ellipse: ellipse [x radius = rx, y radius = ry] draws an ellipse with a horizontal radius of rx and a vertical radius of ry. The short form is ellipse (rx and ry).
• Arc: arc[start angle=a, end angle=b, radius=r] gives a part of a circle with a radius of r at the current coordinate, starting from angles a to angles b. The short command version is arc(a:b:r).

arc[start angle=a, end angle=b, x radius=rx, y radius=ry] gives a part of an ellipse with an x radius of rx and a y radius of ry at the current coordinate, starting from angle a and going to angle b. The short syntax would be arc(a:b:rx and ry).

Let’s have a few examples to see what these commands do:

1. Draw a circle with a radius of 2 at the origin:
\draw (0,0) circle [radius=2];
2. Next, draw an ellipse with a horizontal radius of 0.2 and a vertical radius of 0.4:
\draw (-0.5,0.5,0) ellipse [x radius=0.2, y radius=0.4];
3. Now, draw the same ellipse at (0.5,0.5):
\draw (0.5,0.5) ellipse [x radius=0.2, y radius=0.4];
4. Next, draw an arc that looks like a smile:
\draw (-1,-1) arc [start angle=185, end angle=355,
  x radius=1, y radius=0.5];
5. Finally, draw a rectangle with the lower-left corner at -3,-3 and the upper-right corner at 3,3:
\draw (-3,-3) rectangle (3,3);

When you use all the commands from steps 1 to 5 in a tikzpicture environment and compile, you get the following:

Figure 2.9 – A smiley in a rectangle

This result of the command examples still looks a bit dull. Let’s improve it a bit and fill it with color.