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float[]x = new float[4];
float[]y = new float[4];
boolean[]permitDrag = new boolean[4];
void setup() {
size(300, 300);
smooth();
// startpoint coordinates
x[0] = x[1] = 50;
y[0] = 50;
y[1] = y[2] = 150;
x[2] = x[3] = 250;
y[3] = 250;
}
void draw() {
background(255);
noFill();
stroke(0, 0, 255);
bezier (x[1], y[1], x[0], y[0], x[3], y[3], x[2], y[2]);
// the bezier handles
strokeWeight(1);
stroke(100);
line(x[0], y[0], x[1], y[1]);
line(x[2], y[2], x[3], y[3]);
// the anchor and control points
stroke(0);
fill(0);
for (int i =0; i< 4; i++) {
if (i ==0 || i==3) {
fill(255, 100, 10);
rectMode(CENTER);
rect(x[i], y[i], 5, 5);
} else {
fill(0);
ellipse(x[i], y[i], 5, 5);
}
}
// permit dragging
for (int i =0; i< 4; i++) {
if (permitDrag[i]) {
x[i] = mouseX;
y[i] = mouseY;
}
}
}
void mouseReleased () {
for (int i =0; i< 4; i++) {
permitDrag[i] = false;
}
}
void mousePressed () {
for (int i =0; i< 4; i++) {
if (mouseX>=x[i]-5 && mouseX<=x[i]+10 && mouseY>=y[i]-5 && mouseY<=y[i]+10) {
permitDrag[i] = true;
}
}
}
// hand curser when over dragging over points
void mouseMoved () {
cursor(ARROW);
for (int i =0; i< 4; i++) {
if (mouseX>=x[i]-5 && mouseX<=x[i]+10 && mouseY>=y[i]-5 && mouseY<=y[i]+10) {
cursor(HAND);
}
}
}