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Index › Programming Questions & Help › Programs › arc interaction

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arc interaction (Read 737 times)

Lupiae

arc interaction
Apr 3^rd, 2010, 10:00am

Hi, I'm trying to make a mouse interactive project with some arc.
This is the code I wrote:

int diam=80;
int x=-diam/2;
int y=0;
float transX=120;
float transY=60;

void setup () {

size (400,400);
smooth();
}
void draw () {
background (255);
strokeWeight(1.5);
stroke(0);
fill(255,0,0);
float theta = PI/2*mouseX / width;

pushMatrix();
translate (transX,transY);
rotate (-theta);
ellipseMode(CORNER);
arc(x, y, diam, diam, PI+HALF_PI, TWO_PI+HALF_PI);
line(0,0, 0,diam);
popMatrix();

pushMatrix();
translate (transX,transY);
rotate (theta);
ellipseMode(CORNER);
arc(x,y,diam,diam, PI/2,PI+HALF_PI);
line(0,0, 0,diam);
popMatrix();

pushMatrix();
translate (transX,transY+2*diam);
rotate (theta);
ellipseMode(CORNER);
arc(x,y-diam, diam, diam, PI+HALF_PI, TWO_PI+HALF_PI);
line(0,-diam, 0,0);
popMatrix();

pushMatrix();
translate (transX,transY+2*diam);
rotate (-theta);
ellipseMode(CORNER);
arc(x,y-diam,diam,diam, PI/2,PI+HALF_PI);
line(0,-diam, 0,0);
popMatrix();
}

As you can see the mouseX variation open and close the arcs. I'm trying to make the two lower arcs united with the first two. Undecided

Anybody can help me?

TfGuy44

Re: arc interaction
Reply #1 - Apr 4^th, 2010, 12:39pm

Quote:

int diam=80;
int x=-diam/2;
int y=0;
float transX=120;
float transY=100;

void setup () {

size (400,400);
smooth();
}
void draw () {
background (255);
strokeWeight(1.5);
stroke(0);
fill(255,0,0);
float theta = PI/2*mouseX / width;

pushMatrix();
translate (transX,transY);
  translate(0,-diam*cos(theta));
rotate (-theta);
ellipseMode(CORNER);
arc(x, y, diam, diam, PI+HALF_PI, TWO_PI+HALF_PI);
line(0,0, 0,diam);
popMatrix();

pushMatrix();
translate (transX,transY);
  translate(0,-diam*cos(theta));
rotate (theta);
ellipseMode(CORNER);
arc(x,y,diam,diam, PI/2,PI+HALF_PI);
line(0,0, 0,diam);
popMatrix();

pushMatrix();
translate (transX,transY);
  translate(0,diam*cos(theta));
rotate (theta);
ellipseMode(CORNER);
arc(x,y-diam, diam, diam, PI+HALF_PI, TWO_PI+HALF_PI);
line(0,-diam, 0,0);
popMatrix();

pushMatrix();
translate (transX,transY);
translate(0,diam*cos(theta));
rotate (-theta);
ellipseMode(CORNER);
arc(x,y-diam,diam,diam, PI/2,PI+HALF_PI);
line(0,-diam, 0,0);
popMatrix();
}

I think that's what you want.

Lupiae

Re: arc interaction
Reply #2 - Apr 4^th, 2010, 5:45pm

Hey, Thank you for the answer!!! It's a good solution. Today i re-write the code from the start and i find another way to do it. By the way thank's a lot!!!

void setup() {
size(500,500);
smooth();
ellipseMode(CORNER);
fill(255,0,0);
}

void draw() {

background (255);
float a = PI/2*mouseX / width;
int d = 100;
int x =100, y = 100;

pushMatrix();

translate(x,y);
rotate(-a);
line(0,0, -d,0);
arc(-d,-d/2,d,d,PI,TWO_PI);

translate(0,0);
rotate(2*a);
line(0,0, d,0);
arc(0,-d/2,d,d,PI,TWO_PI);

translate(d,0);
rotate(PI+(-2*a));
line(0,0, d,0);
arc(0,-d/2,d,d,PI,TWO_PI);

translate(d,0);
rotate(2*a);
line(0,0, d,0);
arc(0,-d/2,d,d,PI,TWO_PI);

popMatrix ();
}

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