calc_spline(3alleg4) Allegro manual calc_spline(3alleg4)NAME
calc_spline - Calculates a series of values along a Bezier spline. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
void calc_spline(const int points[8], int npts, int *x, int *y);
DESCRIPTION
Calculates a series of npts values along a Bezier spline, storing them in the output x and y arrays. The Bezier curve is specified by the
four x/y control points in the points array: points[0] and points[1] contain the coordinates of the first control point, points[2] and
points[3] are the second point, etc. Control points 0 and 3 are the ends of the spline, and points 1 and 2 are guides. The curve probably
won't pass through points 1 and 2, but they affect the shape of the curve between points 0 and 3 (the lines p0-p1 and p2-p3 are tangents to
the spline). The easiest way to think of it is that the curve starts at p0, heading in the direction of p1, but curves round so that it
arrives at p3 from the direction of p2. In addition to their role as graphics primitives, spline curves can be useful for constructing
smooth paths around a series of control points, as in exspline.c.
SEE ALSO spline(3alleg4), exspline(3alleg4)Allegro version 4.4.2 calc_spline(3alleg4)
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calc_spline(3alleg4) Allegro manual calc_spline(3alleg4)NAME
calc_spline - Calculates a series of values along a Bezier spline. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
void calc_spline(const int points[8], int npts, int *x, int *y);
DESCRIPTION
Calculates a series of npts values along a Bezier spline, storing them in the output x and y arrays. The Bezier curve is specified by the
four x/y control points in the points array: points[0] and points[1] contain the coordinates of the first control point, points[2] and
points[3] are the second point, etc. Control points 0 and 3 are the ends of the spline, and points 1 and 2 are guides. The curve probably
won't pass through points 1 and 2, but they affect the shape of the curve between points 0 and 3 (the lines p0-p1 and p2-p3 are tangents to
the spline). The easiest way to think of it is that the curve starts at p0, heading in the direction of p1, but curves round so that it
arrives at p3 from the direction of p2. In addition to their role as graphics primitives, spline curves can be useful for constructing
smooth paths around a series of control points, as in exspline.c.
SEE ALSO spline(3alleg4), exspline(3alleg4)Allegro version 4.4.2 calc_spline(3alleg4)
suppose u have a file which consist of many data points separated by asterisk
Question is to extract third part in each line .
0.0002*0.003*-0.93939*0.0202*0.322*0.3332*0.2222*0.22020
0.003*0.3333*0.33322*-0.2220*0.3030*0.2222*0.3331*-0.3030
0.0393*0.3039*-0.03038*0.033*0.4033*0.30384*0.4048... (5 Replies)
Discussion started by: cdfd123
5 Replies
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I have two points which represent the start and end points of a line. I need to interpolate a number of points on the line between the two points.
Point 1:
x = 455989.0
y = 8673453.4
Point 2:
x = 283957.6
y = 8691250.1
The two points I have are coordinates given in UTM format. x... (3 Replies)
Hi guys. Can anyone tell me how to determine points between two coardinates. For example: Which type of command line gives me
50 points between (8, -5, 7) and (2, 6, 9) points
Thanks (5 Replies)
Hi,
Does anyone know how I can do an interpolation (with spline) using awk or any other way?
This is part of the sample:
1 1.36064
1.09999 1.44
1.20005 1.84
1.30005 2.0416
1.39997 2.24
1.49993 2.4416
1.6 2.6592
1.7001 2.88
1.79986 3.1392
1.90006 3.36
Thanks! (2 Replies)
Hi Friends,
I am trying to find coordinates within three points by using a for loop. For example:
I want to find points within the triangular area enclosed by (1,2,3), (4,5,6) and (7,8,9) points.
I want to create a mesh in a triangle and I should know the coordinates of points.
Best... (4 Replies)
x:y field
from 0:0 i have 20 points in every direction
so it's -20 to +20 X and -20 to +20 Y
that's 1681 x:y points
now i need to sort them like:
0:0 0:1 1:1 1:0 1:-1 0:-1 -1:-1 -1:0 -1:1 0:2 1:2 2:2etc
every 1 point square from the middle
which algorithm is better? (10 Replies)