ladanyi@1606: #include "graph_displayer_canvas.h"
alpar@1632: #include <cmath>
hegyi@1510: 
hegyi@1510: void GraphDisplayerCanvas::zoomIn()
hegyi@1510: {
hegyi@1510:   set_pixels_per_unit(
hegyi@1510:       (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit());
hegyi@1510: }
hegyi@1510: 
hegyi@1510: void GraphDisplayerCanvas::zoomOut()
hegyi@1510: {
hegyi@1510:   set_pixels_per_unit(
hegyi@1510:       (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit());
hegyi@1510: }
hegyi@1510: 
hegyi@1510: void GraphDisplayerCanvas::zoomFit()
hegyi@1510: {
ladanyi@1777:   updateScrollRegion();
ladanyi@1777: 
hegyi@1510:   // get the height and width of the canvas
hegyi@1510:   Gtk::Allocation a = get_allocation();
hegyi@1510:   int aw = a.get_width();
hegyi@1510:   int ah = a.get_height();
hegyi@1510: 
hegyi@1510:   // get the bounding box of the graph
ladanyi@1777:   update_now();
ladanyi@1777:   double x1, y1, x2, y2;
ladanyi@1777:   root()->get_bounds(x1, y1, x2, y2);
hegyi@1510: 
hegyi@1510:   // fit the graph to the window
ladanyi@1777:   double ppu1 = (double) aw / fabs(x2 - x1);
ladanyi@1777:   double ppu2 = (double) ah / fabs(y2 - y1);
hegyi@1510:   set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
hegyi@1510: }
hegyi@1510: 
hegyi@1510: void GraphDisplayerCanvas::zoom100()
hegyi@1510: {
ladanyi@1777:   updateScrollRegion();
hegyi@1510:   set_pixels_per_unit(1.0);
hegyi@1510: }
hegyi@1510: 
hegyi@1510: void GraphDisplayerCanvas::updateScrollRegion()
hegyi@1510: {
ladanyi@1777:   // get_bounds() yields something sane only when no updates are pending
ladanyi@1777:   // and it returns a sufficient, not an exact bounding box
ladanyi@1777:   update_now();
ladanyi@1777:   double x1, y1, x2, y2;
ladanyi@1777:   root()->get_bounds(x1, y1, x2, y2);
ladanyi@1777:   set_scroll_region(x1, y1, x2, y2);
hegyi@1510: }