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Diffstat (limited to 'src/display/control/canvas-item-quad.cpp')
| -rw-r--r-- | src/display/control/canvas-item-quad.cpp | 207 |
1 files changed, 207 insertions, 0 deletions
diff --git a/src/display/control/canvas-item-quad.cpp b/src/display/control/canvas-item-quad.cpp new file mode 100644 index 0000000..ccc7b2b --- /dev/null +++ b/src/display/control/canvas-item-quad.cpp @@ -0,0 +1,207 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/** + * A class to represent a control quadrilateral. Used to highlight selected text. + */ + +/* + * Author: + * Tavmjong Bah + * + * Copyright (C) 2020 Tavmjong Bah + * + * Rewrite of SPCtrlQuadr + * + * Released under GNU GPL v2+, read the file 'COPYING' for more information. + */ + +#include "canvas-item-quad.h" + +#include "color.h" // SP_RGBA_x_F + +#include "ui/widget/canvas.h" + +namespace Inkscape { + +/** + * Create an null control quad. + */ +CanvasItemQuad::CanvasItemQuad(CanvasItemGroup *group) + : CanvasItem(group) +{ + _name = "CanvasItemQuad:Null"; + _pickable = false; // For now, nobody gets events from this class! +} + +/** + * Create a control quad. Point are in document coordinates. + */ +CanvasItemQuad::CanvasItemQuad(CanvasItemGroup *group, + Geom::Point const &p0, Geom::Point const &p1, + Geom::Point const &p2, Geom::Point const &p3) + : CanvasItem(group) + , _p0(p0) + , _p1(p1) + , _p2(p2) + , _p3(p3) +{ + _name = "CanvasItemQuad"; + _pickable = false; // For now, nobody gets events from this class! + + request_update(); +} + +/** + * Set a control quad. Points are in document coordinates. + */ +void CanvasItemQuad::set_coords(Geom::Point const &p0, Geom::Point const &p1, Geom::Point const &p2, Geom::Point const &p3) +{ + std::cout << "Canvas_ItemQuad::set_cords: " << p0 << ", " << p1 << ", " << p2 << ", " << p3 << std::endl; + _p0 = p0; + _p1 = p1; + _p2 = p2; + _p3 = p3; + + request_update(); +} + +/** + * Returns distance between point in canvas units and nearest point on quad. + */ +double CanvasItemQuad::closest_distance_to(Geom::Point const &p) +{ + double d = Geom::infinity(); + std::cerr << "CanvasItemQuad::closest_distance_to: Not implemented!" << std::endl; + return d; +} + +/** + * Returns true if point p (in canvas units) is within tolerance (canvas units) distance of quad. + */ +bool CanvasItemQuad::contains(Geom::Point const &p, double tolerance) +{ + if (tolerance != 0) { + std::cerr << "CanvasItemQuad::contains: Non-zero tolerance not implemented!" << std::endl; + } + + Geom::Point p0 = _p0 * _affine; + Geom::Point p1 = _p1 * _affine; + Geom::Point p2 = _p2 * _affine; + Geom::Point p3 = _p3 * _affine; + + // From 2geom rotated-rect.cpp + return + Geom::cross(p1 - p0, p - p0) >= 0 && + Geom::cross(p2 - p1, p - p1) >= 0 && + Geom::cross(p3 - p2, p - p2) >= 0 && + Geom::cross(p0 - p3, p - p3) >= 0; +} + +/** + * Update and redraw control quad. + */ +void CanvasItemQuad::update(Geom::Affine const &affine) +{ + if (_affine == affine && !_need_update) { + // Nothing to do. + return; + } + + if (_p0 == _p1 || + _p1 == _p2 || + _p2 == _p3 || + _p3 == _p0) { + return; // Not quad or not initialized. + } + + // Queue redraw of old area (erase previous content). + request_redraw(); // This is actually never useful as quads are always deleted + // and recreated when a node is moved! But keep it in case we + // change that. CHECK + // Get new bounds + _affine = affine; + + Geom::Rect bounds; + bounds.expandTo(_p0); + bounds.expandTo(_p1); + bounds.expandTo(_p2); + bounds.expandTo(_p3); + bounds *= _affine; // Document to canvas. + bounds.expandBy(2); // Room for anti-aliasing effects. + _bounds = bounds; + + // Queue redraw of new area + request_redraw(); + + _need_update = false; +} + +/** + * Render quad to screen via Cairo. + */ +void CanvasItemQuad::render(Inkscape::CanvasItemBuffer *buf) +{ + if (!buf) { + std::cerr << "CanvasItemQuad::Render: No buffer!" << std::endl; + return; + } + + if (_p0 == _p1 || + _p1 == _p2 || + _p2 == _p3 || + _p3 == _p0) { + return; // Not quad or not initialized. + } + + if (!_visible) { + // Hidden + return; + } + + // Document to canvas + Geom::Point p0 = _p0 * _affine; + Geom::Point p1 = _p1 * _affine; + Geom::Point p2 = _p2 * _affine; + Geom::Point p3 = _p3 * _affine; + + // Canvas to screen + p0 *= Geom::Translate(-buf->rect.min()); + p1 *= Geom::Translate(-buf->rect.min()); + p2 *= Geom::Translate(-buf->rect.min()); + p3 *= Geom::Translate(-buf->rect.min()); + + buf->cr->save(); + + buf->cr->begin_new_path(); + + buf->cr->move_to(p0.x(), p0.y()); + buf->cr->line_to(p1.x(), p1.y()); + buf->cr->line_to(p2.x(), p2.y()); + buf->cr->line_to(p3.x(), p3.y()); + buf->cr->close_path(); + buf->cr->set_source_rgba(SP_RGBA32_R_F(_fill), SP_RGBA32_G_F(_fill), + SP_RGBA32_B_F(_fill), SP_RGBA32_A_F(_fill)); + buf->cr->fill(); + + // Uncomment to show bounds + // Geom::Rect bounds = _bounds; + // bounds.expandBy(-1); + // bounds -= buf->rect.min(); + // buf->cr->set_source_rgba(1.0, 0.0, 0.0, 1.0); + // buf->cr->rectangle(bounds.min().x(), bounds.min().y(), bounds.width(), bounds.height()); + // buf->cr->stroke(); + + buf->cr->restore(); +} + +} // namespace Inkscape + +/* + Local Variables: + mode:c++ + c-file-style:"stroustrup" + c-file-offsets:((innamespace . 0)(inline-open . 0)(case-label . +)) + indent-tabs-mode:nil + fill-column:99 + End: +*/ +// vim: filetype=cpp:expandtab:shiftwidth=4:tabstop=8:softtabstop=4 : |