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annotate doodle/tk/screen_model.d @ 81:d92b9f04b1e8

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author "David Bryant <bagnose@gmail.com>"
date Mon, 16 Aug 2010 00:04:27 +0930
parents doodle/tk/pixel_model.d@535bae7a7305
children 100dd23c7bdf
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1 module doodle.tk.screen_model;
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3 public {
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4 import doodle.tk.geometry;
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5 }
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7 private {
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8 import doodle.core.misc;
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9 }
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11 // This class manages the relationship between screen space and model space.
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12 // Screen is defined as the current window/viewport into the model
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13 // It provides convenient high-level operations.
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14 //
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15 // x and y run right and up respectively for screen and model space
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17 class ScreenModel {
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18 this(in double zoom, in Rectangle canvasBoundsModel, in Rectangle viewBoundsScreen) {
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19 _zoom = zoom;
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20 _viewBoundsScreen = viewBoundsScreen;
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21 _canvasBoundsModel = canvasBoundsModel;
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23 // Choose the centre of the canvas as the centre of the view
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24 _viewCentreModel = _canvasBoundsModel.centre;
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25 }
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27 void consolidateCanvasBounds(in Rectangle requiredCanvasBounds) { _canvasBoundsModel = screenToModel(_viewBoundsScreen) | requiredCanvasBounds; }
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28 void canvasAccommodate(in Rectangle bounds) { _canvasBoundsModel = _canvasBoundsModel | bounds; }
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30 void zoomRelative(in double factor, in Point screenDatum) {
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31 // Work out screen distance from current centre to datum,
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32 // Do the zoom, then work out the new centre that keeps the
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33 // screen distance the same
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35 Point oldModelDatum = screenToModel(screenDatum);
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36 Vector screenDistance = modelToScreen(oldModelDatum - _viewCentreModel);
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37 _zoom = clampZoom(zoom * factor);
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38 _viewCentreModel = oldModelDatum - screenToModel(screenDistance);
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39 }
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41 void panRelativeScreen(in Vector screenDisplacement) { _viewCentreModel = _viewCentreModel + screenToModel(screenDisplacement); }
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42 void panRelativeModel(in Vector modelDisplacement) { _viewCentreModel = _viewCentreModel + modelDisplacement; }
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44 // For userZoom 1.0 -> 100% means the presentation on the screen is one-to-one with real-life
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45 double userZoom(in double pixelsPerMillimetre) const { return _zoom / pixelsPerMillimetre; }
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46 double zoom() const { return _zoom; }
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47 Rectangle viewBoundsScreen() const { return _viewBoundsScreen; }
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48 Rectangle viewBoundsModel() const { return screenToModel(_viewBoundsScreen); }
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49 Rectangle canvasBoundsModel() const { return _canvasBoundsModel; }
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50 Rectangle canvasBoundsScreen() const { return modelToScreen(_canvasBoundsModel); }
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52 Point modelToScreen(in Point model) const { return _viewBoundsScreen.centre + _zoom * (model - _viewCentreModel); }
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53 Point screenToModel(in Point screen) const { return _viewCentreModel + (screen - _viewBoundsScreen.centre) / _zoom; }
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54 Vector modelToScreen(in Vector model) const { return _zoom * model; }
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55 Vector screenToModel(in Vector screen) const { return screen / _zoom; }
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56 Rectangle modelToScreen(in Rectangle model) const { return Rectangle(modelToScreen(model.position), modelToScreen(model.size)); }
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57 Rectangle screenToModel(in Rectangle model) const { return Rectangle(screenToModel(model.position), screenToModel(model.size)); }
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59 private {
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60 static double clampZoom(in double zoom) { return clamp(zoom, 1e-1, 1e2); }
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62 // Screen units are pixels
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63 // Model units are millimetres
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64 double _zoom; // pixels-per-millimetre
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65 Rectangle _viewBoundsScreen; // bounds of the viewport in screen space
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66 Point _viewCentreModel; // where in the model is the centre of our screen
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67 Rectangle _canvasBoundsModel; // the bounds of the canvas in model space
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68 }
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69 }