mirror of
https://github.com/processing/processing4.git
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146 lines
2.8 KiB
Java
146 lines
2.8 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 LetterK extends PApplet {
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/**
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* Letter K
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* by Peter Cho.
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*
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* Move the mouse across the screen to fold the "K".
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*/
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int backgroundColor;
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int foregroundColor;
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int foregroundColor2;
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float px, py;
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float pfx, pfy;
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float pv2, pvx, pvy;
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float pa2, pax, pay;
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float pMass, pDrag;
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public void setup() {
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size(640, 360, P3D);
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noStroke();
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backgroundColor = color(134, 144, 154);
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foregroundColor = color(235, 235, 30);
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foregroundColor2 = color(240, 130, 20);
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initParticle(0.6f, 0.9f, width/2, height/2);
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}
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public void draw() {
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background(backgroundColor);
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pushMatrix();
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iterateParticle(0.15f*(-px+mouseX), 0.15f*(-py+(height-mouseY)));
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translate(width/2, height/2, 0);
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fill(foregroundColor);
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drawK();
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pushMatrix();
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translate(0, 0, 1);
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translate(0.75f * (px-width/2), -0.75f * (py-height/2), 0);
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translate(0.75f * (px-width/2), -0.75f * (py-height/2), 0);
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rotateZ(atan2(-(py-height/2), (px-width/2)) + PI/2);
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rotateX(PI);
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rotateZ(-(atan2(-(py-height/2), (px-width/2)) + PI/2));
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fill(foregroundColor2);
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drawK();
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popMatrix();
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translate(0.75f * (px-width/2), -0.75f * (py-height/2), 2);
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rotateZ(atan2(-(py-height/2), (px-width/2)) + PI/2);
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fill(backgroundColor);
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beginShape(QUADS);
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vertex(-640, 0);
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vertex( 640, 0);
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vertex( 640, -360);
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vertex(-640, -360);
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endShape();
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popMatrix();
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}
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public void initParticle(float _mass, float _drag, float ox, float oy) {
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px = ox;
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py = oy;
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pv2 = 0.0f;
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pvx = 0.0f;
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pvy = 0.0f;
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pa2 = 0.0f;
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pax = 0.0f;
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pay = 0.0f;
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pMass = _mass;
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pDrag = _drag;
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}
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public void iterateParticle(float fkx, float fky) {
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// iterate for a single force acting on the particle
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pfx = fkx;
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pfy = fky;
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pa2 = pfx*pfx + pfy*pfy;
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if (pa2 < 0.0000001f) {
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return;
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}
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pax = pfx/pMass;
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pay = pfy/pMass;
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pvx += pax;
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pvy += pay;
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pv2 = pvx*pvx + pvy*pvy;
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if (pv2 < 0.0000001f) {
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return;
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}
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pvx *= (1.0f - pDrag);
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pvy *= (1.0f - pDrag);
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px += pvx;
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py += pvy;
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}
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public void drawK() {
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pushMatrix();
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scale(1.5f);
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translate(-63, 71);
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beginShape(QUADS);
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vertex(0, 0, 0);
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vertex(0, -142.7979f, 0);
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vertex(37.1992f, -142.7979f, 0);
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vertex(37.1992f, 0, 0);
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vertex(37.1992f, -87.9990f, 0);
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vertex(84.1987f, -142.7979f, 0);
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vertex(130.3979f, -142.7979f, 0);
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vertex(37.1992f, -43.999f, 0);
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vertex(77.5986f-.2f, -86.5986f-.3f, 0);
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vertex(136.998f, 0, 0);
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vertex(90.7988f, 0, 0);
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vertex(52.3994f-.2f, -59.999f-.3f, 0);
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endShape();
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//translate(63, -71);
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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[] { "LetterK" });
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}
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}
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