# 10 Lines: The Menhirs

Menhirs, also called standing stones, are a type of monolith found in Northern Europe. This is a minimal experiment in landscape generation using these objects as inspiration. They rotate with the mouse, and stones are added and remove by left and right clicking respectively.

code:

```//The Menhirs. Ignore the Aztec look.

ArrayList<Menhir> menhirs;

//seperately handles a menhir drawing
void drawMenhir(int x,int y,int dw,int dh){
noStroke();
int ang = dw/4;
fill(255);
beginShape();
vertex(x+dw, y+dh-ang);
vertex(x+dw/2, y+dh);
vertex(x, y+dh-ang);
vertex(x, y+ang);
vertex(x+dw/2,y);
vertex(x+dw,y+ang);
endShape();
stroke(0);
strokeWeight(3);
beginShape();
vertex(x+dw,y+ang + 20);
vertex(x+dw, y+dh-ang);
vertex(x+dw/2, y+dh);
vertex(x+dw/2,y+2*ang);
vertex(x+dw,y+ang);
vertex(x+dw/2,y);
vertex(x, y+ang);
vertex(x, y+dh-ang);
endShape();
noFill();

}

//seperately draws the shadow of a menhir
void drawShadow(int x,int y,int dw,int dh){
int ang = dw/4;
stroke(0);
noFill();
beginShape();
vertex(x, y+dh-ang);
vertex(x-dh,y+dh-ang+(dh/2));  //here be logial derails
vertex(x-dh+dw/10,y+dh-ang+(dh/2)+ang/5);
vertex(x + dw/10, y+dh-ang + ang/5);
vertex(x+ (2*dw/10), y+dh-ang +(2*ang/5));
vertex(x-dh+ (2*dw/10),y+dh-ang+(dh/2)+(2*ang/5));
vertex(x-dh+ (3*dw/10),y+dh-ang+(dh/2)+(3*ang/5));
vertex(x+ (3*dw/10), y+dh-ang +(3*ang/5));
vertex(x+ (4*dw/10), y+dh-ang +(4*ang/5));
vertex(x-dh+ (4*dw/10),y+dh-ang+(dh/2)+(4*ang/5));
vertex(x-dh+ (5*dw/10),y+dh-ang+(dh/2)+(5*ang/5));
vertex(x+ (dw/2) - ang , y+dh-ang + 3*ang/2);
endShape();

}

// class that handles the standing stones
class Menhir{
int x;
int y;
int trueY;
int h;
int w;

Menhir(){
x = 0;
y = 0;
trueY = 0;
h = int(random(90,height/4));
w = int(random(30,width/8));
radius = map (noise(millis()), 0.0,1.0 , 0.0,0.6);
}

//given an angle relative to the baseline (y = width/2),
//places the menhir on that angle.
void update(float ang){
x = width/2 + int(width*radius * cos(ang));
y = height/2 + int(height*radius * sin(ang));
trueY = y;
if(mouseX < width/2) {
x = width - x;
y = height - y;
}
}

}

void display(){
drawMenhir(x,y,w,h);
}

}

//creates the environment and the first menhir
void setup(){
size(700,700);
menhirs = new ArrayList<Menhir>();
}

//function that sorts the menhirs based on y position, so that
//they can later drawn from front to back.
//Zach Rispoli helped write this.
ArrayList<Menhir> zjrispolsort(ArrayList<Menhir> menhirs){
ArrayList<Menhir> sorted = new ArrayList<Menhir>();
ArrayList<Menhir> temp = new ArrayList<Menhir>();
for(int i = 0; i < menhirs.size(); i++){
}
while(temp.size() > 0) {
int minIndex = 0;
for(int i = 0; i < temp.size(); i++) {
if(temp.get(i).y < temp.get(minIndex).y) {
minIndex = i;
}
}
temp.remove(minIndex);
}

return sorted;
}

//finds the relative angle of the mouse, and uses that to find
//the angle that each menhir should hold, then draws them in place
void draw(){
background(255);
float dx = float(mouseX -(width/2));
float dy = float(mouseY -(height/2));
float diff = TWO_PI/float(menhirs.size()+1);

for (int i = 0; i< menhirs.size(); i++) {
Menhir menhir = menhirs.get(i);
float ang = mrads + diff*(i+1);
menhir.update(ang);
}

ArrayList<Menhir> tempMenhirs = zjrispolsort(menhirs);

//shadows rendered seperately so that all menhirs appear in front
for (int i = 0; i< tempMenhirs.size(); i++) {
Menhir menhir = tempMenhirs.get(i);
}

for (int i = 0; i< tempMenhirs.size(); i++) {
Menhir menhir = tempMenhirs.get(i);
menhir.display();
}
}

// left click adds a menhir up to 10, right click removes a menhir
// down to 1
void mousePressed() {
if (mouseButton == LEFT && menhirs.size() < 10){