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/*
* Copyright (c) 2015 Tricoire Sebastien 3dsman@free.fr
*
* This software is provided 'as-is', without any express or implied
* warranty. In no event will the authors be held liable for any damages
* arising from the use of this software.
*
* Permission is granted to anyone to use this software for any purpose,
* including commercial applications, and to alter it and redistribute it
* freely, subject to the following restrictions:
*
* 1. The origin of this software must not be misrepresented; you must not
* claim that you wrote the original software. If you use this software
* in a product, an acknowledgment in the product documentation would be
* appreciated but is not required.
* 2. Altered source versions must be plainly marked as such, and must not be
* misrepresented as being the original software.
* 3. This notice may not be removed or altered from any source distribution.
*
*/
#include "OE_curve.h"
#include "OE_utils.h"
#include <iostream>
#include <GL/gl.h>
#include <cstdlib>
#include <math.h>
#include <cstdio>
#include <cstring>
static inline float minf(float a, float b) { return a < b ? a : b; }
static inline float maxf(float a, float b) { return a > b ? a : b; }
OE_curve::OE_curve()
{
//next = 0; // Pointer to next curve, or NULL if last element.
npts = 0; // Total number of bezier points.
cpts = 0; // Total alocated space for bezier points.
closed = false; // Flag indicating if shapes should be treated as closed.
//pts = 0;
lineColor[0] = 0;
lineColor[1] = 160;
lineColor[2] = 192;
lineColor[3] = 255;
controlPointColor[0] = 100;
controlPointColor[1] = 60;
controlPointColor[2] = 92;
controlPointColor[3] = 255;
controlLineColor[0] = 60;
controlLineColor[1] = 100;
controlLineColor[2] = 92;
controlLineColor[3] = 100;
controlEndPointColor[0] = 200;
controlEndPointColor[1] = 0;
controlEndPointColor[2] = 0;
controlEndPointColor[3] = 255;
}
OE_curve::~OE_curve()
{
// if (pts)
// free(pts);
}
bool OE_curve::getPoint(uint16_t nb, float* x, float* y)
{
if ((npts)&&(nb<=npts))
{
//std::cout << nb<<"--"<<npts<<" ";
*x = pts[(nb-1)].getx();
*y = pts[(nb-1)].gety();
return true;
}
return false;
}
bool OE_curve::setPoint(uint16_t nb, float x, float y)
{
if (nb<=npts)
{
pts[(nb-1)] = vector_2d(x,y);
//pts[(nb-1)*2+1] = y;
return true;
}
return false;
}
bool OE_curve::addPoint( float x, float y)
{
pts.push_back(vector_2d(x,y));
//pts.push_back(y);
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npts++;
cpts = npts+1;
return true;
}
void OE_curve::moveTo(float x, float y)
{
addPoint( x, y);
}
void OE_curve::lineTo(float x, float y)
{
float px,py, dx,dy;
if (npts > 0) {
getPoint(npts, &px, &py);
dx = x - px;
dy = y - py;
addPoint(px + dx/3.0f, py + dy/3.0f);
addPoint(x - dx/3.0f, y - dy/3.0f);
addPoint(x, y);
}
}
void OE_curve::cubicBezTo(float cpx1, float cpy1, float cpx2, float cpy2, float x, float y)
{
addPoint(cpx1, cpy1);
addPoint(cpx2, cpy2);
addPoint(x, y);
}
#define EPSILON (1e-12)
int OE_curve::ptInBounds( vector_2d pt, float* bounds)
return pt.getx() >= bounds[0] && pt.getx() <= bounds[2] && pt.gety() >= bounds[1] && pt.gety() <= bounds[3];
}
double OE_curve::evalBezier(double t, double p0, double p1, double p2, double p3)
{
double it = 1.0-t;
return it*it*it*p0 + 3.0*it*it*t*p1 + 3.0*it*t*t*p2 + t*t*t*p3;
}
double OE_curve::evalBezier(double t, double p0, double p1, double p2)
{
double it = 1.0-t;
//(1-t)²A + 2t(1-t)B + t²C
return it*it*p0 + 2.0*it*t*p1 + t*t*p2;
}
void OE_curve::curveBounds(float* bounds, vector_2d* curve)
vector_2d* v0 = &curve[0];
vector_2d* v1 = &curve[1];
vector_2d* v2 = &curve[2];
vector_2d* v3 = &curve[3];
bounds[0] = minf(v0->getx(), v3->getx());
bounds[1] = minf(v0->gety(), v3->gety());
bounds[2] = maxf(v0->getx(), v3->getx());
bounds[3] = maxf(v0->gety(), v3->gety());
// Bezier curve fits inside the convex hull of it's control points.
// If control points are inside the bounds, we're done.
if (ptInBounds(*v1, bounds) && ptInBounds(*v2, bounds))
return;
// Add bezier curve inflection points in X and Y.
for (i = 0; i < 2; i++) {
if (i){
a = -3.0 * v0->gety() + 9.0 * v1->gety() - 9.0 * v2->gety() + 3.0 * v3->gety();
b = 6.0 * v0->gety() - 12.0 * v1->gety() + 6.0 * v2->gety();
c = 3.0 * v1->gety() - 3.0 * v0->gety();
}
else{
a = -3.0 * v0->getx() + 9.0 * v1->getx() - 9.0 * v2->getx() + 3.0 * v3->getx();
b = 6.0 * v0->getx() - 12.0 * v1->getx() + 6.0 * v2->getx();
c = 3.0 * v1->getx() - 3.0 * v0->getx();
}
count = 0;
if (fabs(a) < EPSILON) {
if (fabs(b) > EPSILON) {
t = -c / b;
if (t > EPSILON && t < 1.0-EPSILON)
roots[count++] = t;
}
} else {
b2ac = b*b - 4.0*c*a;
if (b2ac > EPSILON) {
t = (-b + sqrt(b2ac)) / (2.0 * a);
if (t > EPSILON && t < 1.0-EPSILON)
roots[count++] = t;
t = (-b - sqrt(b2ac)) / (2.0 * a);
if (t > EPSILON && t < 1.0-EPSILON)
roots[count++] = t;
}
}
for (j = 0; j < count; j++) {
if (i){
v = evalBezier(roots[j], v0->gety(), v1->gety(), v2->gety(), v3->gety());
}else{
v = evalBezier(roots[j], v0->getx(), v1->getx(), v2->getx(), v3->getx());
}
bounds[0+i] = minf(bounds[0+i], (float)v);
bounds[2+i] = maxf(bounds[2+i], (float)v);
}
}
}
void OE_curve::getBound(float* xMin, float* yMin, float* xMax, float* yMax)
{
float tmpbounds[4];
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curveBounds(tmpbounds, curve);
if (i == 0) {
bounds[0] = tmpbounds[0];
bounds[1] = tmpbounds[1];
bounds[2] = tmpbounds[2];
bounds[3] = tmpbounds[3];
} else {
bounds[0] = minf(bounds[0], tmpbounds[0]);
bounds[1] = minf(bounds[1], tmpbounds[1]);
bounds[2] = maxf(bounds[2], tmpbounds[2]);
bounds[3] = maxf(bounds[3], tmpbounds[3]);
}
}
*xMin = bounds[0];
*yMin = bounds[1];
*xMax = bounds[2];
*yMax = bounds[3];
}
bool OE_curve::setNext(OE_curve* next)
{
this->next = next;
return true;
}
OE_curve* OE_curve::getNext()
{
return next;
}
int OE_curve::getNpts(){return npts;}
char OE_curve::getClosed(){return closed;}
void OE_curve::setClosed(char closed){this->closed = closed;}
/** \brief draw the curve on screen
*
* \param dpi is the discretisation level of the spline curve to display
* \return true if all is ok
*
*/
bool OE_curve::draw(float dpi)
{
int i;
std::vector<vector_2d> disc = discretizeFast(dpi);
/*for (i = 0; i < npts-1; i += 3) {
float* p = &pts[i*2];
disc = discretizeCubicBez(p[0],p[1], p[2],p[3], p[4],p[5], p[6],p[7], dpi, 0);
}*/
glLineWidth(1.5);
glBegin(GL_LINE_STRIP);
glColor4ubv(lineColor);
for (i = 0; i < discsize-1; i++) {
glVertex2f(disc[i].getx(), disc[i].gety());
}
/*
for (i = 0; i < npts-1; i += 3) {
float* p = &pts[i*2];
cubicBez(p[0],p[1], p[2],p[3], p[4],p[5], p[6],p[7], dpi, 0);
}*/
if (closed) {
glVertex2f(pts[0].getx(), pts[0].gety());
//draw curve points
if(0)
{
glPointSize(3.0f);
glBegin(GL_POINTS);
glVertex2f(pts[0].x, pts[0].y);
for (i = 0; i < discsize-1; i++) {
glVertex2f(disc[i].getx(), disc[i].gety());
}
if (closed) {
glVertex2f(pts[0].getx(), pts[0].gety());
}
glEnd();
}
std::vector<vector_2d> discReg = discretizeRegular(1);
glPointSize(3.0f);
glBegin(GL_POINTS);
glColor3f(0.8,0.1,0.1);
discsize = discReg.size();
for (i = 0; i < discsize-1; i++) {
glVertex2f(discReg[i].getx(), discReg[i].gety());
}
glEnd();
// Control lines
glLineWidth(1.5);
glColor4ubv(controlLineColor);
glBegin(GL_LINES);
for (i = 0; i < npts-1; i += 3) {
vector_2d* p = &pts[i];
glVertex2f(p[0].getx(),p[0].gety());
glVertex2f(p[1].getx(),p[1].gety());
glVertex2f(p[2].getx(),p[2].gety());
glVertex2f(p[3].getx(),p[3].gety());
/*glVertex2f(p[2],p[3]);
}
glEnd();
// Points
glPointSize(5.0f);
glColor4ubv(controlEndPointColor);
glBegin(GL_POINTS);
glVertex2f(pts[0].getx(),pts[0].gety());
for (i = 0; i < npts-2; i += 1) {
vector_2d* p = &pts[i];
glVertex2f(p[3].getx(),p[3].gety());
glVertex2f(pts[(npts-1)].getx(),pts[(npts-1)].gety());
glEnd();
// Points
//glPointSize(5.0f);
glPointSize(3.0f);
glColor4ubv(controlPointColor);
glBegin(GL_POINTS);
//glColor4ubv(bgColor);
//glColor4f(1.0,0.0,0.0,1.0);
// glVertex2f(pts[0],pts[1]);
for (i = 0; i < npts-1; i += 1) {
vector_2d* p = &pts[i];
glVertex2f(p[1].getx(),p[1].gety());
glVertex2f(p[2].getx(),p[2].gety());
//glColor4ubv(bgColor);
//glVertex2f(p[6],p[7]);
}
//glPointSize(5.0f);
//glColor4f(1.0,0.0,0.0,1.0);
//glVertex2f(pts[(npts-1)*2+6],pts[(npts-1)*2+7]);
glEnd();
}
float OE_curve::distPtSeg(vector_2d pt, vector_2d seg1, vector_2d seg2)
{
float d2, t;
vector_2d pq, d;
pq = seg2-seg1;
d = pt-seg1;
d2 = pq.x*pq.x + pq.y*pq.y;
t = pq.x*d.x + pq.y*d.y;
if (d2 > 0) t /= d2;
if (t < 0) t = 0;
else if (t > 1) t = 1;
d = seg1 + t*pq - pt;
return d.x*d.x + d.y*d.y;
}
float OE_curve::distPtSeg(float x, float y, float px, float py, float qx, float qy)
{
float pqx, pqy, dx, dy, d, t;
pqx = qx-px;
pqy = qy-py;
if (d > 0) t /= d;
if (t < 0) t = 0;
else if (t > 1) t = 1;
dx = px + t*pqx - x;
dy = py + t*pqy - y;
return dx*dx + dy*dy;
}
std::vector<vector_2d> OE_curve::discretizeCubicBez(vector_2d pt1, vector_2d pt2, vector_2d pt3, vector_2d pt4, float tol, int level)
std::vector<vector_2d> out;
// float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
/*
x12 = (pt1.getx()+pt2.getx())*0.5f;
y12 = (pt1.gety()+pt2.gety())*0.5f;
x23 = (pt2.getx()+pt3.getx())*0.5f;
y23 = (pt2.gety()+pt3.gety())*0.5f;
x34 = (pt3.getx()+pt4.getx())*0.5f;
y34 = (pt3.gety()+pt4.gety())*0.5f;
x123 = (x12+x23)*0.5f;
y123 = (y12+y23)*0.5f;
x234 = (x23+x34)*0.5f;
y234 = (y23+y34)*0.5f;
x1234 = (x123+x234)*0.5f;
y1234 = (y123+y234)*0.5f;
*/
vector_2d pt12 = (pt1+pt2)*0.5f;
vector_2d pt23 = (pt2+pt3)*0.5f;
vector_2d pt34 = (pt3+pt4)*0.5f;
vector_2d pt123 = (pt12+pt23)*0.5f;
vector_2d pt234 = (pt23+pt34)*0.5f;
vector_2d pt1234 = (pt123+pt234)*0.5f;
//d = distPtSeg(x1234, y1234, x1,y1, x4,y4);
d = distPtSeg(pt1234, pt1, pt4);
out = discretizeCubicBez(pt1, pt12, pt123, pt1234, tol, level+1);
std::vector<vector_2d> tmpdisc = discretizeCubicBez(pt1234, pt234, pt34, pt4, tol, level+1);
out.insert(out.end(), tmpdisc.begin(), tmpdisc.end());
} else {
std::vector<vector_2d> OE_curve::discretizeFast(float maxDist)
//vector_2d* p = &pts[i];
std::vector<vector_2d> tmpdisk = discretizeCubicBez(pts[i], pts[i+1], pts[i+2], pts[i+3], maxDist, 0);
out.insert(out.end(), tmpdisk.begin(), tmpdisk.end());
}
return out;
}
std::vector<vector_2d> OE_curve::discretizeRegular(float dist)
float vectlen, tmplen = 0;
vector_2d vect;
std::vector<vector_2d> out;
std::vector<vector_2d> disc, tmpdisc ;
tmpdisc.push_back(pts[0]);
for (int i = 0; i < npts-3; i += 3) {
//float* p = &pts[i];
//std::vector<float> tmpdisk = discretizeCubicBez(p[0],p[1], p[2],p[3], p[4],p[5], p[6],p[7], dist/10.0, 0);
std::vector<vector_2d> tmpdisk = discretizeCubicBez(pts[i], pts[i+1], pts[i+2], pts[i+3], dist/10.0, 0);
tmpdisc.insert(tmpdisc.end(), tmpdisk.begin(), tmpdisk.end());
}
if (closed)
{
tmpdisc.push_back(pts[0]);
}
tmplen =0;
int discsize;
discsize = tmpdisc.size();
for (int i = 0; i < discsize-2; i += 1) {
vect = tmpdisc[i]-tmpdisc[i+1];
/*
tmplen = tmplen + vectlen;
while (tmplen >= dist)
{
tmplen -= dist;
out.push_back(vect*(tmplen/vectlen)+tmpdisc[i+1]);
//out.push_back(vect.gety()*(tmplen/vectlen)+tmpdisc[i+3]);
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}
}
return out;
}
/*
void OE_curve::cubicBez(float x1, float y1, float x2, float y2,
float x3, float y3, float x4, float y4,
float tol, int level)
{
float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
float d;
if (level > 12) return;
x12 = (x1+x2)*0.5f;
y12 = (y1+y2)*0.5f;
x23 = (x2+x3)*0.5f;
y23 = (y2+y3)*0.5f;
x34 = (x3+x4)*0.5f;
y34 = (y3+y4)*0.5f;
x123 = (x12+x23)*0.5f;
y123 = (y12+y23)*0.5f;
x234 = (x23+x34)*0.5f;
y234 = (y23+y34)*0.5f;
x1234 = (x123+x234)*0.5f;
y1234 = (y123+y234)*0.5f;
d = distPtSeg(x1234, y1234, x1,y1, x4,y4);
if (d > tol*tol) {
cubicBez(x1,y1, x12,y12, x123,y123, x1234,y1234, tol, level+1);
cubicBez(x1234,y1234, x234,y234, x34,y34, x4,y4, tol, level+1);
} else {
glVertex2f(x4, y4);
}
}
*/