* It plots!!!!

[scdataviz] / graphwidget.c

diff --git a/graphwidget.c b/graphwidget.c
index ed9cf4b..03da4c6 100644 (file)
--- a/graphwidget.c
+++ b/graphwidget.c
@@ -34,23 +34,35 @@
 
 G_DEFINE_TYPE(GraphWidget, graph_widget, GTK_TYPE_DRAWING_AREA);
 
+#define INSET_PERCENT 0.1
+
 struct drawing_context {
   GtkWidget *widget;
   cairo_t *cr;
   double radius;
+  double xoffset;
+  double yoffset;
+  double xscaling;
+  double yscaling;
 };
 
 static void draw_point(gpointer data, gpointer user_data) {
   struct drawing_context *cxt = (struct drawing_context *) user_data;
   double *d = (double*)data;
-  cairo_arc(cxt->cr, d[0], d[1], cxt->radius, 0, 2*M_PI);
+  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);
 }
 
 static void draw(GtkWidget *graph, cairo_t *cr) {
   struct drawing_context cxt;
+  GraphWidget *gw = GRAPH_WIDGET(graph);
   #ifdef DEBUG
-    fprintf(stderr, "draw(%d, %d)\n", graph, cr);
-    fprintf(stderr, "allocation.x=%d, allocation.y=%d, allocation.height=%d, allocation.width=%d\n", graph->allocation.x, graph->allocation.y, graph->allocation.height, graph->allocation.width);
+  fprintf(stderr, "draw(%d, %d)\n", (int)graph, (int)cr);
+  fprintf(stderr, "allocation.x=%d, allocation.y=%d, allocation.height=%d, allocation.width=%d\n", graph->allocation.x, graph->allocation.y, graph->allocation.height, graph->allocation.width);
   #endif
   double x0=graph->allocation.x;
   double y0=graph->allocation.y;
@@ -58,17 +70,24 @@ static void draw(GtkWidget *graph, cairo_t *cr) {
   double width=graph->allocation.width;
   cxt.widget = graph;
   cxt.cr = cr;
-  cxt.radius = ((height < width)? height : width)*0.01;
+  cxt.radius = 0.01;
+  cxt.xscaling = (gw->graph->points->len == 1)? 1 : (1/(gw->graph->maxx - gw->graph->minx));
+  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);
   #ifdef DEBUG
   fprintf(stderr, "x0=%g, y0=%g, width=%g, height=%g\n", x0, y0, height, width);
-  fprintf(stderr, "move_to(%d, %g->%g, %g->%g)\n", cr, graph_data[0], graph->allocation.x + graph_data[0]*(graph->allocation.width), graph_data[1], graph->allocation.y + graph_data[1]*(graph->allocation.height));
-  #endif
+  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
+  double offset_height =  ((width>=height)?height*INSET_PERCENT:0);;
+  double offset_width = ((height>=width)?width*INSET_PERCENT:0); 
+  double inset_height = height - offset_height;
+  double inset_width = width - offset_width;
   cairo_save(cr);
-  cairo_translate(cr, x0, y0);
-  cairo_scale(cr, width, height);
+  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_set_source_rgb(cr, 0, 0, 0);
-  cairo_stroke(cr);
   cairo_restore(cr);
 }