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-rw-r--r--src/toys/squiggles.cpp216
1 files changed, 216 insertions, 0 deletions
diff --git a/src/toys/squiggles.cpp b/src/toys/squiggles.cpp
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+++ b/src/toys/squiggles.cpp
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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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