/*======== public void addCurve() ==========
Inputs: int x0
int y0
int x1
int y1
int x2
int y2
int x3
int y3
Returns:
Generates the edges required to create a curve
and adds them to the edge matrix
03/09/12 18:00:06
jonalf
====================*/
public void addCurve(
double x0,
double y0,
double x1,
double y1,
double x2,
double y2,
double x3,
double y3,
int type) {
EdgeMatrix xcoefs = new EdgeMatrix(1);
EdgeMatrix ycoefs = new EdgeMatrix(1);
// a lower step value makes a more precise curve
double step = 0.01;
double x, y, z, ax, ay, bx, by, cx, cy, dx, dy;
if (type == gui.HERMITE_MODE) {
xcoefs.generateHermiteCoefs(x0, x1, x2, x3);
ycoefs.generateHermiteCoefs(y0, y1, y2, y3);
} else {
xcoefs.generateBezierCoefs(x0, x1, x2, x3);
ycoefs.generateBezierCoefs(y0, y1, y2, y3);
}
ax = xcoefs.getX(0);
bx = xcoefs.getY(0);
cx = xcoefs.getZ(0);
dx = xcoefs.getD(0);
ay = ycoefs.getX(0);
by = ycoefs.getY(0);
cy = ycoefs.getZ(0);
dy = ycoefs.getD(0);
double startx = x0;
double starty = y0;
for (double t = step; t <= 1; t += step) {
x = ax * t * t * t + bx * t * t + cx * t + dx;
y = ay * t * t * t + by * t * t + cy * t + dy;
addEdge(startx, starty, 0, x, y, 0);
startx = x;
starty = y;
}
}
