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#include <2geom/piecewise.h>
#include <2geom/sbasis.h>
#include <2geom/bezier-to-sbasis.h>
#include <2geom/sbasis-math.h>
#include <2geom/sbasis-geometric.h>
#include <toys/path-cairo.h>
#include <toys/toy-framework-2.h>
#include <vector>
#define NB_CTL_PTS 6
#define K_SCALE .002
using namespace Geom;
using namespace std;
void cairo_pw(cairo_t *cr, Piecewise<SBasis> p) {
for(unsigned i = 0; i < p.size(); i++) {
D2<SBasis> B;
B[0] = Linear(p.cuts[i], p.cuts[i+1]);
B[1] = Linear(150) + p[i];
cairo_d2_sb(cr, B);
}
}
void cairo_horiz(cairo_t *cr, double y, vector<double> p) {
for(double i : p) {
cairo_move_to(cr, i, y);
cairo_rel_line_to(cr, 0, 10);
}
}
void cairo_vert(cairo_t *cr, double x, vector<double> p) {
for(double i : p) {
cairo_move_to(cr, x, i);
cairo_rel_line_to(cr, 10, 0);
}
}
/*
Piecewise<SBasis> interpolate(std::vector<double> values, std::vector<double> times){
assert ( values.size() == times.size() );
if ( values.size() == 0 ) return Piecewise<SBasis>();
if ( values.size() == 1 ) return Piecewise<SBasis>(values[0]);//what about time??
SBasis bump_in = Linear(0,1);//Enough for piecewise linear interpolation.
//bump_in.push_back(Linear(-1,1));//uncomment for C^1 interpolation
SBasis bump_out = Linear(1,0);
//bump_out.push_back(Linear(1,-1));
Piecewise<SBasis> result;
result.cuts.push_back(times[0]);
for (unsigned i = 0; i<values.size()-1; i++){
result.push(bump_out*values[i]+bump_in*values[i+1],times[i+1]);
}
return result;
}
*/
//#include <toys/pwsbhandle.cpp // FIXME: This looks like it may give problems later, (including a .cpp file)
class Squiggles: public Toy {
PointSetHandle hand;
unsigned current_ctl_pt;
Point current_pos;
Point current_dir;
std::vector<double> curvatures;
std::vector<double> times;
Piecewise<D2<SBasis> > curve;
double tot_length;
int mode; //0=set curvature, 1=set curv.+rotation, 2=translate, 3=slide time.
void mouse_moved(GdkEventMotion* e) override{
mode = 0;
if((e->state & (GDK_SHIFT_MASK)) &&
(e->state & (GDK_CONTROL_MASK))) {
mode = 3;
}else if(e->state & (GDK_CONTROL_MASK)) {
mode = 1;
}else if(e->state & (GDK_SHIFT_MASK)) {
mode = 2;
}
Toy::mouse_moved(e);
}
void draw(cairo_t *cr, std::ostringstream *notify, int width, int height, bool save, std::ostringstream *timer_stream) override {
cairo_set_source_rgba (cr, 0., 0., 0., 1);
cairo_set_line_width (cr, 1);
*notify << "Drag to set curvature,\n";
*notify << "SHIFT-Drag to move curve,\n";
*notify << "CTRL-Drag to rotate,\n";
*notify << "SHIFT-CTRL-Drag to slide handles.";
//Get user input
if (mouse_down && selected) {
for(unsigned i = 0; i < handles.size(); i++) {
if(selected == handles[i]){
current_ctl_pt = i;
break;
}
}
double time = times[current_ctl_pt];
current_pos = curve.valueAt(time);
current_dir = derivative(curve).valueAt(time);//*This should be a unit vector!*
Point hdle = dynamic_cast<PointHandle*>(handles[current_ctl_pt])->pos;
if (mode == 0){
curvatures[current_ctl_pt] = cross(hdle - current_pos,current_dir)*K_SCALE;
}else if (mode == 1){//Rotate
double sign = ( curvatures[current_ctl_pt]>=0 ? 1 : -1 );
//curvatures[current_ctl_pt] = sign*L2(hdle - current_pos)*K_SCALE;
current_dir = -sign*unit_vector(rot90(hdle - current_pos));
}else if (mode == 2){//Translate
Point old_pos = current_pos + curvatures[current_ctl_pt]/K_SCALE*rot90(current_dir);
current_pos += hdle - old_pos;
curve += hdle - old_pos;
}else if (mode == 3){//Slide time
Point old_pos = current_pos + curvatures[current_ctl_pt]/K_SCALE*rot90(current_dir);
double delta = dot(hdle - old_pos,current_dir);
double epsilon = 2;
if (current_ctl_pt>0 && times[current_ctl_pt]+delta < times[current_ctl_pt-1]+epsilon){
delta = times[current_ctl_pt-1] + epsilon - times[current_ctl_pt];
}
if (current_ctl_pt<times.size()-1 && times[current_ctl_pt]+delta > times[current_ctl_pt+1]-epsilon){
delta = times[current_ctl_pt+1] - epsilon - times[current_ctl_pt];
}
times[current_ctl_pt] += delta;
current_pos += delta*current_dir;
}
}
//Compute new curve
Piecewise<SBasis> curvature = interpolate( times, curvatures , 1);
Piecewise<SBasis> alpha = integral(curvature);
Piecewise<D2<SBasis> > v = sectionize(tan2(alpha));
curve = integral(v)+Point(100,100);
//transform to keep current point in place
double time = times[current_ctl_pt];
Point new_pos = curve.valueAt(time);
Point new_dir = v.valueAt(time);
Affine mat1 = Affine( new_dir[X], new_dir[Y], -new_dir[Y], new_dir[X], new_pos[X], new_pos[Y]);
Affine mat2 = Affine(current_dir[X],current_dir[Y],-current_dir[Y],current_dir[X],current_pos[X],current_pos[Y]);
mat1 = mat1.inverse()*mat2;
curve = curve*mat1;
v = v*mat1.withoutTranslation();
//update handles
cairo_save(cr);
double dashes[2] = {3, 2};
cairo_set_dash(cr, dashes, 2, 0);
cairo_set_line_width(cr, .5);
cairo_set_source_rgba (cr, 0., 0., 0.5, 1);
for(unsigned i = 0; i < NB_CTL_PTS; i++) {
Point m = curve.valueAt(times[i]);
dynamic_cast<PointHandle*>(handles[i])->pos = m +
curvatures[i]/K_SCALE*rot90(v.valueAt(times[i]));
draw_handle(cr, m);
cairo_move_to(cr, m);
cairo_line_to(cr, dynamic_cast<PointHandle*>(handles[i])->pos);
}
#if 0
D2<Piecewise<SBasis> > graphe;
graphe[X] = Piecewise<SBasis>(Linear(100,300));
graphe[Y] = -curvature/K_SCALE+400;
graphe[X].setDomain(graphe[Y].domain());
cairo_d2_pw_sb(cr, graphe);
#endif
cairo_stroke(cr);
cairo_restore(cr);
cairo_pw_d2_sb(cr, curve);
cairo_set_source_rgba (cr, 0., 0., 0, 1);
cairo_stroke(cr);
Toy::draw(cr, notify, width, height, save,timer_stream);
}
bool should_draw_numbers() override { return false; }
public:
Squiggles () {
current_ctl_pt = 0;
current_dir = Point(1,0);
current_pos = Point(100,100);
tot_length = 300;
curve = Piecewise<D2<SBasis> >(D2<SBasis>(SBasis(100.,300.),SBasis(100.,100.)));
for(unsigned i = 0; i < NB_CTL_PTS; i++) {
curvatures.push_back(0);
times.push_back(i*tot_length/(NB_CTL_PTS-1));
PointHandle *pt_hdle = new PointHandle(Geom::Point(100+i*tot_length/(NB_CTL_PTS-1), 100.));
handles.push_back(pt_hdle);
}
}
};
int main(int argc, char **argv) {
init(argc, argv, new Squiggles());
return 0;
}
/*
Local Variables:
mode:c++
c-file-style:"stroustrup"
c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +))
indent-tabs-mode:nil
fill-column:99
End:
*/
// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=4:softtabstop=4:fileencoding=utf-8:textwidth=99 :
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