hegyi@27: #include <graph_displayer_canvas.h>
hegyi@27: #include <broken_edge.h>
hegyi@27: #include <math.h>
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@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@27: }
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::zoomFit()
hegyi@27: {
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:   // add some space
hegyi@27:   aw -= 5; if (aw < 0) aw = 0;
hegyi@27:   ah -= 5; if (ah < 0) ah = 0;
hegyi@27: 
hegyi@27:   // get the bounding box of the graph
hegyi@27:   double wx1, wy1, wx2, wy2;
hegyi@27:   Gnome::Canvas::Item* pCanvasItem = root();
hegyi@27:   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);
hegyi@27: 
hegyi@27:   // fit the graph to the window
hegyi@27:   double ppu1 = (double) aw / fabs(wx2 - wx1);
hegyi@27:   double ppu2 = (double) ah / fabs(wy2 - wy1);
hegyi@27:   set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2);
hegyi@27: }
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::zoom100()
hegyi@27: {
hegyi@27:   set_pixels_per_unit(1.0);
hegyi@27: }
hegyi@27: 
hegyi@27: void GraphDisplayerCanvas::updateScrollRegion()
hegyi@27: {
hegyi@27:   double wx1, wy1, wx2, wy2;
hegyi@27:   Gnome::Canvas::Item* pCanvasItem = root();
hegyi@27:   pCanvasItem->get_bounds(wx1, wy1, wx2, wy2);
hegyi@27:   set_scroll_region(wx1, wy1, wx2, wy2);
hegyi@27: }