hi guys, i stuck in the situation that the tow text-line cannot reveal along the path. Following is the code …
import tracer.*;
import tracer.paths.*;
//style
int fgColor = #FFFFFF; //foreground color
int bgColor = #DC443A; //background color
//text
String text = "Experiment A...Experiment B...Experiment C ";
float startu; //1D position where text starts
float dstartu = 0.00005; //1D text speed per millisecondimport tracer.*;
import tracer.paths.*;
//path
//Lissajous path;
CubicBezier bezier1;
CubicBezier bezier2;
CubicBezier bezier3;
CubicBezier bezier4;
Composite path1;
Composite path2;
Composite path3;
float dphi = 0.0005; //change in phi per millisecond
int d;
int k;
//time
int prevt; //the previous time in milliseconds
void setup(){
size(360, 360, P2D);
bezier1 = new CubicBezier (100, 0, 360, 0, 100, 200, 460, 200);
bezier2 = new CubicBezier (0, 100, 360, 100, 0, 300, 360, 300);
bezier3 = new CubicBezier (-100, 200, 260, 200, -100, 200, 260, 200);
bezier4 = new CubicBezier (-200, 300, 160, 300, -200, 300, 160, 300);
path1 = new Composite (bezier1, bezier2);
path2 = new Composite (bezier3, bezier4);
path3 = new Composite (path1, path2);
prevt = millis();
}
void draw() {
int dt = millis() - prevt;
prevt = millis();
startu += dstartu * dt;
background(bgColor);
noStroke();
fill(fgColor);
textSize(22);
for (int k=0; k<1; k++){
String stringk = text;
embedText(path3, stringk);
}
}
void embedText (Path path3, String stringk) {
Point a = new Point(0, 0);
Point b = new Point(0, 0);
float textWidthAcc = 0;
float textWidthTotal = textWidth(text);
for (int i=0; i<stringk.length(); i++) {
char c = stringk.charAt(i);
textWidthAcc += 0.5 * textWidth(c);
float u = (startu + map(textWidthAcc, 0, textWidthTotal, 0, 1 )) % 1;
path3.trace(a, u);
path3.trace(b, (u + 0.000001) % 1.0);
float angleOfRotation = atan2(b.y - a.y, b.x - a.x);
drawChar(stringk.charAt(i), a.x, b.y, angleOfRotation);
textWidthAcc += 0.5 * textWidth(c);
println(a);
}
}
void drawChar(char c, float x, float y, float angle) {
textAlign(CENTER, CENTER);
pushMatrix();
translate(x, y);
rotate(angle);
text(c, 0, 0);
popMatrix();
}
it ends up becoming …
I am so curious why the two lines below cannot reveal along the path … looking forward to your reply!
Shang
