Bitmap/Bézier curves/Cubic: Difference between revisions
→{{header|Processing}}
Line 1,088:
Can also be drawn in 3D.
bezier(x1, y1, z1, x2, y2, z2, x3, y3, z3, x4, y4, z4)
*/</lang>A working sketch with movable anchor and control points.
*/</lang>▼
It can be run on line [https://www.openprocessing.org/sketch/846556/ here.]
<lang>
int ptSize = 6;
float[]x = new float[4];
float[]y = new float[4];
boolean[]permitDrag = new boolean[4];
void setup() {
size(300, 300);
smooth();
// fill coordinate arrays
x[0] = x[1] = 50;
x[2] = x[3] = width-50;
y[0] = height/2-50;
y[3] = height/2+50;
y[1] = y[2] = height/2;
//initialize dragging flags to false
for (int i =0; i< 4; i++) {
permitDrag[i] = false;
}
}
void draw() {
background(255);
noFill();
stroke(0, 30, 200);
bezier (x[1], y[1], x[0], y[0], x[3], y[3], x[2], y[2]);
// draw bezier handles
strokeWeight(1);
stroke(100);
line(x[0], y[0], x[1], y[1]);
line(x[2], y[2], x[3], y[3]);
// draw anchor/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], ptSize, ptSize);
} else {
fill(0);
ellipse(x[i], y[i], ptSize, ptSize);
}
}
// start dragging if flag true
for (int i =0; i< 4; i++) {
if (permitDrag[i]) {
x[i] = mouseX;
y[i] = mouseY;
}
}
}
// release any point attached to the mouse
void mouseReleased () {
for (int i =0; i< 4; i++) {
permitDrag[i] = false;
}
}
// for dragg'n dem points
void mousePressed () {
for (int i =0; i< 4; i++) {
if (mouseX>=x[i]-5 && mouseX<=x[i]+ptSize+5 &&
mouseY>=y[i]-5 && mouseY<=y[i]+ptSize+5) {
permitDrag[i] = true;
}
}
}
// show hand when over draggable points
void mouseMoved () {
cursor(ARROW);
for (int i =0; i< 4; i++) {
if (mouseX>=x[i]-5 && mouseX<=x[i]+ptSize+5 &&
mouseY>=y[i]-5 && mouseY<=y[i]+ptSize+5) {
cursor(HAND);
}
}
=={{header|PureBasic}}==
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