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https://github.com/processing/processing4.git
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65 lines
1.3 KiB
Java
65 lines
1.3 KiB
Java
import processing.core.*;
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import java.applet.*;
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import java.awt.*;
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import java.awt.image.*;
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import java.awt.event.*;
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import java.io.*;
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import java.net.*;
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import java.text.*;
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import java.util.*;
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import java.util.zip.*;
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import java.util.regex.*;
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public class Follow3 extends PApplet {
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/**
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* Follow 3.
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* Based on code from Keith Peters (www.bit-101.com).
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*
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* A segmented line follows the mouse. The relative angle from
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* each segment to the next is calculated with atan2() and the
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* position of the next is calculated with sin() and cos().
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*/
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float[] x = new float[20];
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float[] y = new float[20];
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float segLength = 9;
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public void setup() {
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size(200, 200);
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smooth();
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strokeWeight(5);
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stroke(0, 100);
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}
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public void draw() {
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background(226);
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dragSegment(0, mouseX, mouseY);
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for(int i=0; i<x.length-1; i++) {
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dragSegment(i+1, x[i], y[i]);
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}
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}
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public void dragSegment(int i, float xin, float yin) {
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float dx = xin - x[i];
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float dy = yin - y[i];
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float angle = atan2(dy, dx);
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x[i] = xin - cos(angle) * segLength;
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y[i] = yin - sin(angle) * segLength;
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segment(x[i], y[i], angle);
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}
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public void segment(float x, float y, float a) {
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pushMatrix();
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translate(x, y);
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rotate(a);
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line(0, 0, segLength, 0);
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popMatrix();
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}
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static public void main(String args[]) {
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PApplet.main(new String[] { "Follow3" });
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}
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}
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