Processing: Creative Coding and Computational Art

PROCESSING: CREATIVE CODING AND COMPUTATIONAL ART
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The rest of the examples in this chapter will be 2D. (Drawing in 3D will be discussed later
in the book.) Utilizing the line() function, you can more easily create complex linear
structures than using either the point() or PImage approaches. Aside from specifying the
position and length of a line, you can use some of Processing’s rendering style functions to
affect the rendering state of the line. Next is a very simple example demonstrating the use
of the strokeWeight() function (see Figure 6-23).
size(500, 300);
background(255);
int step = height/10;
for (int i=step; i< height; i+=step ){
strokeWeight(i*.1);
line(20, i, width-20, i);
}
Figure 6-23. Stroke weight variation example
As the line or stroke increases in weight, the end caps of the line become very prominent.
The default style is ROUND. However, end caps can be set using the strokeCap() function
by passing one of three constants, ROUND, PROJECT, or SQUARE, to the function. I recoded
the last example, changing some of the end caps (see Figure 6-24). Please also note the
strokeCap() function only works with the default JAVA2D rendering mode. If you specify
any of the other modes (P3D, OPENGL, or P2D), this feature will not work.
size(500, 300);
background(255);
int step = height/10;
int[]caps = {ROUND, PROJECT, SQUARE};
int j = 0;
for (int i=step; i2){
j=0;
}
line(20, i, width-20, i);
}