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view doodle/tk/pixel_model.d @ 70:0e61702c6ea6
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author | "David Bryant <bagnose@gmail.com>" |
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date | Sat, 14 Aug 2010 20:05:55 +0930 |
parents | |
children | 0f7cf6c6f206 |
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module doodle.tk.pixel_model; public { import doodle.tk.geometry; } // FIXME consider using the term Screen instead of Pixel... class PixelModel { this(in double zoom, in Rectangle canvasBounds, in Rectangle viewBounds) { _zoom = zoom; _viewBounds = viewBounds; _canvasBounds = canvasBounds; _viewCentre = _canvasBounds.centre; } void consolidateCanvasBounds(in Rectangle requiredCanvasBounds) { Rectangle r = pixelToModel(_viewBounds); _canvasBounds = r | requiredCanvasBounds; } // For normalZoom 1.0 -> 100% means the presentation on the screen is // one-to-one with real-life double normalZoom(in double pixelsPerMillimetre) { return _zoom / pixelsPerMillimetre; } Point modelToPixel(in Point model) const { return _viewBounds.centre + _zoom * (model - _viewCentre); } Point pixelToModel(in Point pixel) const { return _viewCentre + (pixel - _viewBounds.centre) / _zoom; } Vector modelToPixel(in Vector model) const { return _zoom * model; } Vector pixelToModel(in Vector pixel) const { return pixel / _zoom; } Rectangle modelToPixel(in Rectangle model) const { return Rectangle(modelToPixel(model.position), modelToPixel(model.size)); } Rectangle pixelToModel(in Rectangle model) const { return Rectangle(pixelToModel(model.position), pixelToModel(model.size)); } private { // Screen units are pixels // Model units are millimetres double _zoom; // pixels-per-millimetre Rectangle _viewBounds; // pixel: bounds of the viewport in pixels Point _viewCentre; // model: where in the model is the centre of our view Rectangle _canvasBounds; // model: the bounds of the canvas in millimetres } }