* Now wit hlabels and line drawing!

[scdataviz] / graphwidget.c

diff --git a/graphwidget.c b/graphwidget.c
index 03da4c6..fe209ca 100644 (file)
--- a/graphwidget.c
+++ b/graphwidget.c
@@ -44,17 +44,50 @@ struct drawing_context {
   double yoffset;
   double xscaling;
   double yscaling;
+  double bezier_p0_x;
+  double bezier_p0_y;
+  double bezier_p1_x;
+  double bezier_p1_y;
+  int draw_line;
+  int not_first_point;
 };
 
 static void draw_point(gpointer data, gpointer user_data) {
-  struct drawing_context *cxt = (struct drawing_context *) user_data;
-  double *d = (double*)data;
-  fprintf(stderr, "draw_point(x=%g(%g) y=%g(%g)) xscaling=%g yscaling=%g xoffset=%g yoffset=%g\n", d[0], (d[0] + cxt->xoffset)*cxt->xscaling, d[1], (d[1] + cxt->yoffset)*cxt->yscaling, cxt->xscaling, cxt->yscaling, cxt->xoffset, cxt->yoffset);
-  cairo_arc(cxt->cr, (d[0] + cxt->xoffset)*cxt->xscaling, (d[1] + cxt->yoffset)*cxt->yscaling, cxt->radius, 0, 2*M_PI);
-  cairo_set_source_rgb(cxt->cr, 1, 1, 1);
-  cairo_fill_preserve(cxt->cr);
-  cairo_set_source_rgb(cxt->cr, 0, 0, 0);
-  cairo_stroke(cxt->cr);
+  struct drawing_context *cxt = user_data;
+  struct graph_point *pt = data;
+  double x = (pt->x + cxt->xoffset)*cxt->xscaling;
+  double y = (pt->y + cxt->yoffset)*cxt->yscaling;
+  double bezier_p2_x = (pt->bezier_to_x + cxt->xoffset)*cxt->xscaling;
+  double bezier_p2_y = (pt->bezier_to_y + cxt->yoffset)*cxt->yscaling;
+  #ifdef DEBUG
+  fprintf(stderr, "\tcxt=(cr=%x, rad=%g, xoffset=%g, yoffset=%g, xscaling=%g, yscaling=%g, p0_x=%g, p0_y=%g, p1_x=%g, p1_y=%g, draw_line=%d, not_first_point=%d)\n", (unsigned int)cxt->cr, cxt->radius, cxt->xoffset, cxt->yoffset, cxt->xscaling, cxt->yscaling, cxt->bezier_p0_x, cxt->bezier_p0_y, cxt->bezier_p1_x, cxt->bezier_p1_y, cxt->draw_line, cxt->not_first_point);
+  #endif
+  /*Draw line to here if we need to.*/
+  if(cxt->draw_line && cxt->not_first_point) {
+    /*Note that the cxt points are already normalized*/
+    //cairo_move_to(cxt->cr, cxt->bezier_p0_x, cxt->bezier_p0_y);
+    cairo_curve_to(cxt->cr, cxt->bezier_p1_x, cxt->bezier_p1_y, bezier_p2_x, bezier_p2_y, x, y);
+  }else{
+    cairo_move_to(cxt->cr, x, y);
+  }    
+  #ifdef DEBUG
+  fprintf(stderr, "\t\tpt=(x=%g, y=%g, label=%s, from_x=%g, from_y=%g, to_x=%g, to_y=%g)\n", pt->x, pt->y, pt->label->str, pt->bezier_from_x, pt->bezier_from_y, pt->bezier_to_x, pt->bezier_to_y);
+  fprintf(stderr, "\t\tx=%g, y=%g, p2_x=%g, p2_y=%g\n", x, y, bezier_p2_x, bezier_p2_y);
+  #endif
+  cairo_arc(cxt->cr, x, y, cxt->radius, 0, 2*M_PI);
+  if(pt->label != NULL) {
+    cairo_save(cxt->cr);
+    cairo_translate(cxt->cr, 0, 1);
+    cairo_scale(cxt->cr, 1, -1);
+    cairo_show_text(cxt->cr, pt->label->str);
+    cairo_restore(cxt->cr);
+  }
+  /*Set up the context for the next point*/
+  cxt->bezier_p0_x = x;
+  cxt->bezier_p0_y = y;
+  cxt->bezier_p1_x = (pt->bezier_from_x + cxt->xoffset)*cxt->xscaling;
+  cxt->bezier_p1_y = (pt->bezier_from_y + cxt->yoffset)*cxt->yscaling;
+  cxt->not_first_point=1;
 }
 
 static void draw(GtkWidget *graph, cairo_t *cr) {
@@ -75,7 +108,11 @@ static void draw(GtkWidget *graph, cairo_t *cr) {
   cxt.yscaling = (gw->graph->points->len == 1)? 1 : (1/(gw->graph->maxy - gw->graph->miny));
   cxt.xoffset = (gw->graph->points->len == 1)? (-gw->graph->minx/2) : (-gw->graph->minx);
   cxt.yoffset = (gw->graph->points->len == 1)? (-gw->graph->miny/2) : (-gw->graph->miny);
+  /*Signal that the point is the first point.*/
+  cxt.draw_line=0;
+  cxt.not_first_point=0;
   #ifdef DEBUG
+  fprintf(stderr, "minx=%g, maxx=%g, miny=%g, maxy=%g, xscaling=%g, yscaling=%g, xoffset=%g, yoffset=%g\n", gw->graph->minx, gw->graph->maxx, gw->graph->miny, gw->graph->maxy, cxt.xscaling, cxt.yscaling, cxt.xoffset, cxt.yoffset);
   fprintf(stderr, "x0=%g, y0=%g, width=%g, height=%g\n", x0, y0, height, width);
   fprintf(stderr, "translate=(%g, %g)\n", x0 + ((width>height)?(width-height)/2.0:0), y0+((width > height)?height:width) + ((height>width)?(height-width)/2.0:0));
 #endif
@@ -87,7 +124,14 @@ static void draw(GtkWidget *graph, cairo_t *cr) {
   cairo_translate(cr, x0 + ((inset_width>inset_height)?(inset_width-inset_height)/2.0:0) + offset_width/2, y0+((inset_width > inset_height)?inset_height:inset_width) + ((inset_width>=inset_height)?0:(inset_height-inset_width)/2.0) + offset_height/2 );
   cairo_scale(cr, (inset_width > inset_height)?inset_height:inset_width, (inset_width > inset_height)?-inset_height:-inset_width);
   cairo_set_line_width(cr, 0.005);
-  g_ptr_array_foreach(GRAPH_WIDGET(graph)->graph->points, &draw_point, (gpointer)&cxt);
+  cairo_select_font_face (cr, "Georgia",
+                         CAIRO_FONT_SLANT_NORMAL, CAIRO_FONT_WEIGHT_BOLD);
+  cairo_set_font_size (cr, 0.05);
+  g_ptr_array_foreach(gw->graph->points, &draw_point, (gpointer)&cxt);
+  cairo_set_source_rgb(cr, 1, 1, 1);
+  cairo_fill_preserve(cr);
+  cairo_set_source_rgb(cr, 0, 0, 0);
+  cairo_stroke(cr);
   cairo_restore(cr);
 }
 
@@ -118,3 +162,4 @@ GtkWidget *graph_widget_new(void) {
 Graph* graph_widget_get_graph(GraphWidget* gw) {
   return gw->graph;
 }
+