I tried to run your program, but had to change a few thing to make it work. Here is what I have:
I used sideLen0 = 729 cause it's a power of 3, but it doesn't really matter.
sideLen0 is fixed, sideLen is variable.
I added a random color for each stage.
(fRule = "F+F--F+F"; outside spikes)
(fRule = "F-F++F-F"; inside spikes)
int generations = 5;
int sideLen0 = 729;
int gen = 0;
int sideLen = sideLen0;- String initiator = "F--F--F";
String fRule = "F+F--F+F";
float angle = PI/3;
- void setup()
{
size(730, 850);
background(0);
stroke(255);
//noLoop();
}
- void draw()
{
stroke(random(255),random(255),random(255));
// Move to starting position
int startX = width/2 - (sideLen0/2);
int startY = height/2 + int(sideLen0/3.5);
- translate(startX, startY);
- String rules = generateState(initiator, gen);
- // Map string to graphics
print(gen+".");
for (int i = 0; i < rules.length(); i++) {
print(rules.charAt(i));
turtleGraphics(rules.charAt(i));
}
println();
- //next generation
gen++;
sideLen = sideLen/3;
if (gen==generations) noLoop();
}//draw()
- // Take the initiator and number of generations and compute final state
String generateState(String initial, int generations) {
String state = initial;
- for (int i = 0; i < generations; i++) {
state = substitue(state, fRule);
}
return state;
}//generateState()
- // Use the replacment rule to create new string
String substitue(String s, String fRule)
{
String newString = "";
for (int i = 0; i < s.length(); i++) {
// Replace each instance of F
if (s.charAt(i) == 'F') {
newString += fRule;
}
else {
newString += s.charAt(i);
}
}
return newString;
}
- // Map the string to turtle graphics commands
void turtleGraphics(char c)
{
switch(c) {
case 'F':
line(0, 0, sideLen, 0);
translate(sideLen, 0);
break;
case '+':
rotate(angle);
break;
case '-':
rotate(-angle);
break;
}
}//turtleGraphics()
Below is another variation with both rules together:
"F+F--F+F"; (outside spikes)
"F-F++F-F"; (inside spikes)
int generations = 5;
int sideLen0 = 729;
int gen = 0;
int sideLen = sideLen0;- String initiator = "F--F--F";
String fRule1 = "F+F--F+F";
String fRule2 = "F-F++F-F";
float angle = PI/3;
- void setup()
{
size(740, 850);
background(0);
stroke(255);
//noLoop();
}
- void draw()
{
//random color
int colR=int(random(30,225));
int colG=int(random(30,225));
int colB=int(random(30,225));
color col1=color(colR, colG, colB);
color col2=color(255-colR, 255-colG, 255-colB);
- // Move to starting position
int startX = width/2 - (sideLen0/2);
int startY = height/2 + int(sideLen0/3.5);
translate(startX, startY);
pushMatrix();
- //outside flake
stroke(col1);
String rules1 = generateState(initiator, gen, fRule1);
// Map string to graphics
print(gen+".");
for (int i = 0; i < rules1.length(); i++) {
print(rules1.charAt(i));
turtleGraphics(rules1.charAt(i));
}
println();
- //inside flake
popMatrix();
stroke(col2);
String rules2 = generateState(initiator, gen, fRule2);
// Map string to graphics
print(gen+".");
for (int i = 0; i < rules2.length(); i++) {
print(rules2.charAt(i));
turtleGraphics(rules2.charAt(i));
}
println();
- //next generation
gen++;
sideLen = sideLen/3;
if (gen==generations) noLoop();
}//draw()
- // Take the initiator and number of generations and compute final state
String generateState(String initial, int generations, String fRule) {
String state = initial;
- for (int i = 0; i < generations; i++) {
state = substitue(state, fRule);
}
return state;
}//generateState()
- // Use the replacement rule to create new string
String substitue(String s, String fRule)
{
String newString = "";
for (int i = 0; i < s.length(); i++) {
// Replace each instance of F
if (s.charAt(i) == 'F') {
newString += fRule;
}
else {
newString += s.charAt(i);
}
}
return newString;
}//substitue()
- // Map the string to turtle graphics commands
void turtleGraphics(char c)
{
switch(c) {
case 'F':
line(0, 0, sideLen, 0);
translate(sideLen, 0);
break;
case '+':
rotate(angle);
break;
case '-':
rotate(-angle);
break;
}
}//turtleGraphics()
