ladanyi@53: #include "graph_displayer_canvas.h"
alpar@59: #include <cmath>
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::zoomIn()
hegyi@27: {
hegyi@27:   set_pixels_per_unit(
hegyi@27:       (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
hegyi@156:   if(zoomtrack)
hegyi@156:     {
hegyi@156:       propertyChange(false, N_RADIUS);
hegyi@157:       propertyChange(true, E_WIDTH);
hegyi@156:     }
hegyi@27: }
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::zoomOut()
hegyi@27: {
hegyi@27:   set_pixels_per_unit(
hegyi@27:       (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
hegyi@156:   if(zoomtrack)
hegyi@156:     {
hegyi@157:       propertyChange(true, E_WIDTH);
hegyi@156:       propertyChange(false, N_RADIUS);
hegyi@156:     }
hegyi@27: }
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::zoomFit()
hegyi@27: {
ladanyi@87:   updateScrollRegion();
ladanyi@87: 
hegyi@27:   // get the height and width of the canvas
hegyi@27:   Gtk::Allocation a = get_allocation();
hegyi@27:   int aw = a.get_width();
hegyi@27:   int ah = a.get_height();
hegyi@27: 
hegyi@27:   // get the bounding box of the graph
ladanyi@87:   update_now();
ladanyi@87:   double x1, y1, x2, y2;
ladanyi@87:   root()->get_bounds(x1, y1, x2, y2);
hegyi@27: 
hegyi@27:   // fit the graph to the window
ladanyi@87:   double ppu1 = (double) aw / fabs(x2 - x1);
ladanyi@87:   double ppu2 = (double) ah / fabs(y2 - y1);
hegyi@27:   set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
hegyi@156: 
hegyi@156:   if(zoomtrack)
hegyi@156:     {
hegyi@157:       propertyChange(true, E_WIDTH);
hegyi@156:       propertyChange(false, N_RADIUS);
hegyi@156:     }
hegyi@27: }
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::zoom100()
hegyi@27: {
ladanyi@87:   updateScrollRegion();
hegyi@27:   set_pixels_per_unit(1.0);
hegyi@156: 
hegyi@156:   if(zoomtrack)
hegyi@156:     {
hegyi@157:       propertyChange(true, E_WIDTH);
hegyi@156:       propertyChange(false, N_RADIUS);
hegyi@156:     }
hegyi@27: }
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::updateScrollRegion()
hegyi@27: {
ladanyi@87:   // get_bounds() yields something sane only when no updates are pending
ladanyi@87:   // and it returns a sufficient, not an exact bounding box
ladanyi@87:   update_now();
ladanyi@87:   double x1, y1, x2, y2;
ladanyi@87:   root()->get_bounds(x1, y1, x2, y2);
ladanyi@87:   set_scroll_region(x1, y1, x2, y2);
hegyi@27: }