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Topic: Averaging line buffers (Read 1823 times) |
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Mark Hill
 
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Averaging line buffers
« on: Apr 7th, 2005, 10:20am » |
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I've been looking at TomC's elegant use of the vector class and am trying to smooth out the contents of a line buffer to the overall average shape (which kind of works).
The method I'm using is quite crude and force closes an object - relying upon a feedback loop.
Can anyone see a way of dispensing with the need to rely on the enclosure method I'm currently using
The ideal situation would be averaging out to a (pre-stored) geometric figure - triangle, circle, rectangle, again any ideas on an effective way of doing this
I've dropped out some of Tom's code just to simplify this post. I'll modify in a sec with original link... Here it is:
REPLY 12
http://processing.org/discourse/yabb/board_Syntax_action_displa_y_num_1091820063.html
The penultimate line of Tom's melt() method should be changed to read:
Code:
else if (finished && points.size() <= 2) {
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otherwise the line buffer never drops an element.
Here's my bastardized version I'm enquiring about:
Code:
Vector lines = new Vector();
// for recording the mouse
Line newLine;
void setup() {
size(320,240);
strokeWeight(2);
ellipseMode(CENTER_DIAMETER);
smooth();
}
void loop() {
background(255);
if (mousePressed) {
if (newLine == null) {
// start a new line
newLine = new Line();
lines.addElement(newLine);
}
// record the current mouse position
newLine.points.addElement(new Point2f(mouseX,mouseY));
}
else if (newLine != null) {
// set finished
newLine.finished = true;
// clear the line
newLine = null;
}
for (int i = 0; i < lines.size(); i++) {
Line line = (Line)lines.elementAt(i);
line.draw();
if(keyPressed) {
line.melt();
}
}
}
class Point2f {
float x,y;
Point2f() {
x = y = 0;
}
Point2f(int x, int y) {
this.x = x;
this.y = y;
}
}
class Line {
Vector points = new Vector();
boolean finished = false;
boolean fade = false;
void draw() {
if (points.size() >= 2) {
for (int j = 0; j < points.size()-1; j++) {
Point2f a = (Point2f)points.elementAt(j);
Point2f b = (Point2f)points.elementAt(j+1);
stroke(0);
fill(0);
line(a.x,a.y,b.x,b.y);
noStroke();
ellipse(a.x,a.y, 4,4);
}
}
}
void melt() {
for (int j = 0; j < points.size()-1; j++) {
Point2f a = (Point2f)points.elementAt(j);
Point2f b = (Point2f)points.elementAt(j+1);
a.x = (a.x + b.x) / 2;
a.y = (a.y + b.y) / 2;
}
// force close the object
Point2f a = (Point2f)points.elementAt(0);
Point2f b = (Point2f)points.elementAt(points.size()-1);
b.x = (a.x);
b.y = (a.y);
}
}
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| « Last Edit: Apr 7th, 2005, 1:42pm by Mark Hill » |
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