[53] | 1 | #include "graph_displayer_canvas.h" |
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[59] | 2 | #include <cmath> |
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[27] | 3 | |
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| 4 | void GraphDisplayerCanvas::zoomIn() |
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| 5 | { |
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| 6 | set_pixels_per_unit( |
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| 7 | (1.0 + (double) zoom_step / 100.0) * get_pixels_per_unit()); |
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| 8 | } |
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| 9 | |
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| 10 | void GraphDisplayerCanvas::zoomOut() |
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| 11 | { |
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| 12 | set_pixels_per_unit( |
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| 13 | (1.0 - (double) zoom_step / 100.0) * get_pixels_per_unit()); |
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| 14 | } |
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| 15 | |
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| 16 | void GraphDisplayerCanvas::zoomFit() |
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| 17 | { |
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[87] | 18 | updateScrollRegion(); |
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| 19 | |
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[27] | 20 | // get the height and width of the canvas |
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| 21 | Gtk::Allocation a = get_allocation(); |
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| 22 | int aw = a.get_width(); |
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| 23 | int ah = a.get_height(); |
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| 24 | |
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| 25 | // get the bounding box of the graph |
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[87] | 26 | update_now(); |
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| 27 | double x1, y1, x2, y2; |
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| 28 | root()->get_bounds(x1, y1, x2, y2); |
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[27] | 29 | |
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| 30 | // fit the graph to the window |
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[87] | 31 | double ppu1 = (double) aw / fabs(x2 - x1); |
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| 32 | double ppu2 = (double) ah / fabs(y2 - y1); |
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[27] | 33 | set_pixels_per_unit((ppu1 < ppu2) ? ppu1 : ppu2); |
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| 34 | } |
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| 35 | |
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| 36 | void GraphDisplayerCanvas::zoom100() |
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| 37 | { |
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[87] | 38 | updateScrollRegion(); |
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[27] | 39 | set_pixels_per_unit(1.0); |
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| 40 | } |
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| 41 | |
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| 42 | void GraphDisplayerCanvas::updateScrollRegion() |
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| 43 | { |
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[87] | 44 | // get_bounds() yields something sane only when no updates are pending |
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| 45 | // and it returns a sufficient, not an exact bounding box |
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| 46 | update_now(); |
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| 47 | double x1, y1, x2, y2; |
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| 48 | root()->get_bounds(x1, y1, x2, y2); |
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| 49 | set_scroll_region(x1, y1, x2, y2); |
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[27] | 50 | } |
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