static Vector2 ComputeRightTangent(
Point2 *d, /* Digitized points */
int end) /* Index to "right" end of region */
{
Vector2 tHat2;
tHat2 = V2SubII(d[end-1], d[end]);
tHat2 = *V2Normalize(&tHat2);
return tHat2;
}
/*
* ComputeLeftTangent, ComputeRightTangent, ComputeCenterTangent :
*Approximate unit tangents at endpoints and "center" of digitized curve
*/
static Vector2 ComputeLeftTangent(
Point2 *d, /* Digitized points*/
int end) /* Index to "left" end of region */
{
Vector2 tHat1;
tHat1 = V2SubII(d[end+1], d[end]);
tHat1 = *V2Normalize(&tHat1);
return tHat1;
}
Vector2 CBCStroke::ComputeRightTangent(
DISCURVE& d, /* Digitized points */
int end) /* Index to "right" end of region */
{
Vector2 tHat2;
tHat2 = V2SubII(d[end-1], d[end]);
tHat2 = *V2Normalize(&tHat2);
return tHat2;
}
/*
* ComputeLeftTangent, ComputeRightTangent, ComputeCenterTangent :
*Approximate unit tangents at endpoints and "center" of digitized curve
*/
Vector2 CBCStroke::ComputeLeftTangent(
DISCURVE& d, /* Digitized points*/
int end) /* Index to "left" end of region */
{
Vector2 tHat1;
tHat1 = V2SubII(d[end+1], d[end]);
tHat1 = *V2Normalize(&tHat1);
return tHat1;
}
static Vector2 ComputeCenterTangent(Point2 *d, int center) {
Vector2 V1, V2, tHatCenter;
V1 = V2SubII(d[center-1], d[center]);
V2 = V2SubII(d[center], d[center+1]);
tHatCenter.x = (V1.x + V2.x)/2.0;
tHatCenter.y = (V1.y + V2.y)/2.0;
tHatCenter = *V2Normalize(&tHatCenter);
return tHatCenter;
}
static Vector2 ComputeCenterTangent(
Point2 *d, /* Digitized points */
int center) /* Index to point inside region */
{
Vector2 V1, V2, tHatCenter;
V1 = V2SubII(d[center-1], d[center]);
V2 = V2SubII(d[center], d[center+1]);
tHatCenter.x = (V1.x + V2.x)/2.0;
tHatCenter.y = (V1.y + V2.y)/2.0;
tHatCenter = *V2Normalize(&tHatCenter);
return tHatCenter;
}
static Vector2 ComputeRightTangent(Point2 *d, int end) {
Vector2 tHat2;
tHat2 = V2SubII(d[end-1], d[end]);
tHat2 = *V2Normalize(&tHat2);
return tHat2;
}
/*
* ComputeLeftTangent, ComputeRightTangent, ComputeCenterTangent :
*Approximate unit tangents at endpoints and "center" of digitized curve
*/
static Vector2 ComputeLeftTangent(Point2 *d, int end) {
Vector2 tHat1;
tHat1 = V2SubII(d[end+1], d[end]);
tHat1 = *V2Normalize(&tHat1);
return tHat1;
}
