Processing之旅-----【给鱼插上翅膀，Processing基础扩展库4】
下面我们开始学习Processing自带库-----PDF。这个库实际上是用来导出生成PDF的，导出的可以是文件，也可以是图片甚至可以是连续动画的每一帧。
下面我们看一个官方自动的例程。
import processing.pdf.*;
void setup() {
size(400, 400, PDF, "filename.pdf");
}
void draw() {
// Draw something good here
line(0, 0, width/2, height);
// Exit the program
println("Finished.");
exit();
}
这个就是成生产的PDF
/**
* PDF Complex
* by Marius Watz (workshop.evolutionzone.com).
*
* Example using PDF to output complex 3D geometry for print.
* Press "s" to save a PDF.
*/
import processing.opengl.*;
import processing.pdf.*;
// Trig lookup tables borrowed from Toxi. Cryptic but effective
float sinLUT[];
float cosLUT[];
float SINCOS_PRECISION=1.0;
int SINCOS_LENGTH= int((360.0/SINCOS_PRECISION));
// System data
boolean dosave=false;
int num;
float pt[];
int style[];
void setup() {
size(600, 600, OPENGL);
frameRate(24);
background(255);
// Fill the tables
sinLUT=new float;
cosLUT=new float;
for (int i = 0; i < SINCOS_LENGTH; i++) {
sinLUT= (float)Math.sin(i*DEG_TO_RAD*SINCOS_PRECISION);
cosLUT= (float)Math.cos(i*DEG_TO_RAD*SINCOS_PRECISION);
}
num = 150;
pt = new float; // rotx, roty, deg, rad, w, speed
style = new int; // color, render style
// Set up arc shapes
int index=0;
float prob;
for (int i=0; i<num; i++) {
pt = random(PI*2); // Random X axis rotation
pt = random(PI*2); // Random Y axis rotation
pt = random(60,80); // Short to quarter-circle arcs
if(random(100)>90) pt=(int)random(8,27)*10;
pt = int(random(2,50)*5); // Radius. Space them out nicely
pt = random(4,32); // Width of band
if(random(100)>90) pt=random(40,60); // Width of band
pt = radians(random(5,30))/5; // Speed of rotation
// get colors
prob = random(100);
if(prob<30) style=colorBlended(random(1), 255,0,100, 255,0,0, 210);
else if(prob<70) style=colorBlended(random(1), 0,153,255, 170,225,255, 210);
else if(prob<90) style=colorBlended(random(1), 200,255,0, 150,255,0, 210);
else style=color(255,255,255, 220);
if(prob<50) style=colorBlended(random(1), 200,255,0, 50,120,0, 210);
else if(prob<90) style=colorBlended(random(1), 255,100,0, 255,255,0, 210);
else style=color(255,255,255, 220);
style=(int)(random(100))%3;
}
}
void draw() {
if(dosave) {
// set up PGraphicsPDF for use with beginRaw()
PGraphicsPDF pdf = (PGraphicsPDF)beginRaw(PDF, "pdf_complex_out.pdf");
// set default Illustrator stroke styles and paint background rect.
pdf.strokeJoin(MITER);
pdf.strokeCap(SQUARE);
pdf.fill(0);
pdf.noStroke();
pdf.rect(0,0, width,height);
}
background(0);
int index=0;
translate(width/2,height/2,0);
rotateX(PI/6);
rotateY(PI/6);
for (int i=0; i<num; i++) {
pushMatrix();
rotateX(pt);
rotateY(pt);
if(style==0) {
stroke(style);
noFill();
strokeWeight(1);
arcLine(0,0, pt,pt,pt);
}
else if(style==1) {
fill(style);
noStroke();
arcLineBars(0,0, pt,pt,pt);
}
else {
fill(style);
noStroke();
arc(0,0, pt,pt,pt);
}
// increase rotation
pt+=pt/10;
pt+=pt/20;
popMatrix();
}
if(dosave) {
endRaw();
dosave=false;
}
}
// Get blend of two colors
public int colorBlended(float fract,
float r, float g, float b,
float r2, float g2, float b2, float a) {
r2 = (r2 - r);
g2 = (g2 - g);
b2 = (b2 - b);
return color(r + r2 * fract, g + g2 * fract, b + b2 * fract, a);
}
// Draw arc line
public void arcLine(float x,float y,float deg,float rad,float w) {
int a=(int)(min (deg/SINCOS_PRECISION,SINCOS_LENGTH-1));
int numlines=(int)(w/2);
for (int j=0; j<numlines; j++) {
beginShape();
for (int i=0; i<a; i++) {
vertex(cosLUT*rad+x,sinLUT*rad+y);
}
endShape();
rad += 2;
}
}
// Draw arc line with bars
public void arcLineBars(float x,float y,float deg,float rad,float w) {
int a = int((min (deg/SINCOS_PRECISION,SINCOS_LENGTH-1)));
a /= 4;
beginShape(QUADS);
for (int i=0; i<a; i+=4) {
vertex(cosLUT*(rad)+x,sinLUT*(rad)+y);
vertex(cosLUT*(rad+w)+x,sinLUT*(rad+w)+y);
vertex(cosLUT*(rad+w)+x,sinLUT*(rad+w)+y);
vertex(cosLUT*(rad)+x,sinLUT*(rad)+y);
}
endShape();
}
// Draw solid arc
public void arc(float x,float y,float deg,float rad,float w) {
int a = int(min (deg/SINCOS_PRECISION,SINCOS_LENGTH-1));
beginShape(QUAD_STRIP);
for (int i = 0; i < a; i++) {
vertex(cosLUT*(rad)+x,sinLUT*(rad)+y);
vertex(cosLUT*(rad+w)+x,sinLUT*(rad+w)+y);
}
endShape();
}
void keyPressed() {
if (key == 's') {
dosave=true;
}
}
void mouseReleased() {
background(255);
}
上面是官方自带的PDF程序中比较COOL的一个
很~~cool~~~ 厉害 processing! 谢谢楼主，学习。
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