#include <climits>
#include <cfloat>
#include <cmath>
+#include <vector>
#include <glibmm/threads.h>
(www.korf.co.uk/spline.pdf) for more details.
*/
- double x[npoints];
- double y[npoints];
+ vector<double> x(npoints);
+ vector<double> y(npoints);
uint32_t i;
ControlList::EventList::const_iterator xx;
int32_t original_veclen;
int32_t npoints;
+ if (veclen == 0) {
+ return;
+ }
+
if ((npoints = _list.events().size()) == 0) {
- for (i = 0; i < veclen; ++i) {
+ /* no events in list, so just fill the entire array with the default value */
+ for (int32_t i = 0; i < veclen; ++i) {
vec[i] = _list.default_value();
}
return;
}
+ if (npoints == 1) {
+ for (int32_t i = 0; i < veclen; ++i) {
+ vec[i] = _list.events().front()->value;
+ }
+ return;
+ }
+
/* events is now known not to be empty */
max_x = _list.events().back()->when;
min_x = _list.events().front()->when;
- lx = max (min_x, x0);
-
- if (x1 < 0) {
- x1 = _list.events().back()->when;
+ if (x0 > max_x) {
+ /* totally past the end - just fill the entire array with the final value */
+ for (int32_t i = 0; i < veclen; ++i) {
+ vec[i] = _list.events().back()->value;
+ }
+ return;
}
- hx = min (max_x, x1);
+ if (x1 < min_x) {
+ /* totally before the first event - fill the entire array with
+ * the initial value.
+ */
+ for (int32_t i = 0; i < veclen; ++i) {
+ vec[i] = _list.events().front()->value;
+ }
+ return;
+ }
original_veclen = veclen;
*/
double frac = (min_x - x0) / (x1 - x0);
- int32_t subveclen = (int32_t) floor (veclen * frac);
+ int64_t fill_len = (int64_t) floor (veclen * frac);
- subveclen = min (subveclen, veclen);
+ fill_len = min (fill_len, (int64_t)veclen);
- for (i = 0; i < subveclen; ++i) {
+ for (i = 0; i < fill_len; ++i) {
vec[i] = _list.events().front()->value;
}
- veclen -= subveclen;
- vec += subveclen;
+ veclen -= fill_len;
+ vec += fill_len;
}
if (veclen && x1 > max_x) {
/* fill some end section of the array with the default or final value */
double frac = (x1 - max_x) / (x1 - x0);
-
- int32_t subveclen = (int32_t) floor (original_veclen * frac);
-
+ int64_t fill_len = (int64_t) floor (original_veclen * frac);
float val;
- subveclen = min (subveclen, veclen);
-
+ fill_len = min (fill_len, (int64_t)veclen);
val = _list.events().back()->value;
- i = veclen - subveclen;
-
- for (i = veclen - subveclen; i < veclen; ++i) {
+ for (i = veclen - fill_len; i < veclen; ++i) {
vec[i] = val;
}
- veclen -= subveclen;
- }
-
- if (veclen == 0) {
- return;
- }
-
- if (npoints == 1) {
-
- for (i = 0; i < veclen; ++i) {
- vec[i] = _list.events().front()->value;
- }
- return;
+ veclen -= fill_len;
}
+ lx = max (min_x, x0);
+ hx = min (max_x, x1);
if (npoints == 2) {
return _list.events().back()->value;
}
+ ControlEvent* after = (*range.second);
+ range.second--;
+ ControlEvent* before = (*range.second);
+
+ double vdelta = after->value - before->value;
+
+ if (vdelta == 0.0) {
+ return before->value;
+ }
+
+ double tdelta = x - before->when;
+ double trange = after->when - before->when;
+
+ return before->value + (vdelta * (tdelta / trange));
+
+#if 0
double x2 = x * x;
ControlEvent* ev = *range.second;
- return ev->coeff[0] + (ev->coeff[1] * x) + (ev->coeff[2] * x2) + (ev->coeff[3] * x2 * x);
+ return = ev->coeff[0] + (ev->coeff[1] * x) + (ev->coeff[2] * x2) + (ev->coeff[3] * x2 * x);
+#endif
+
}
/* x is a control point in the data */