131 lines
3.8 KiB
C++
131 lines
3.8 KiB
C++
/*
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* Copyright 2019 University of Toronto
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* Authors: Mario Badr, Sameh Attia and Tanner Young-Schultz
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*/
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#include "ezgl/control.hpp"
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#include "ezgl/camera.hpp"
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#include "ezgl/canvas.hpp"
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namespace ezgl {
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static rectangle zoom_in_world(point2d zoom_point, rectangle world, double zoom_factor)
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{
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double const left = zoom_point.x - (zoom_point.x - world.left()) / zoom_factor;
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double const bottom = zoom_point.y + (world.bottom() - zoom_point.y) / zoom_factor;
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double const right = zoom_point.x + (world.right() - zoom_point.x) / zoom_factor;
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double const top = zoom_point.y - (zoom_point.y - world.top()) / zoom_factor;
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return {{left, bottom}, {right, top}};
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}
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static rectangle zoom_out_world(point2d zoom_point, rectangle world, double zoom_factor)
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{
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double const left = zoom_point.x - (zoom_point.x - world.left()) * zoom_factor;
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double const bottom = zoom_point.y + (world.bottom() - zoom_point.y) * zoom_factor;
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double const right = zoom_point.x + (world.right() - zoom_point.x) * zoom_factor;
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double const top = zoom_point.y - (zoom_point.y - world.top()) * zoom_factor;
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return {{left, bottom}, {right, top}};
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}
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void zoom_in(canvas *cnv, double zoom_factor)
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{
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point2d const zoom_point = cnv->get_camera().get_world().center();
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rectangle const world = cnv->get_camera().get_world();
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cnv->get_camera().set_world(zoom_in_world(zoom_point, world, zoom_factor));
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cnv->redraw();
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}
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void zoom_in(canvas *cnv, point2d zoom_point, double zoom_factor)
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{
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zoom_point = cnv->get_camera().widget_to_world(zoom_point);
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rectangle const world = cnv->get_camera().get_world();
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cnv->get_camera().set_world(zoom_in_world(zoom_point, world, zoom_factor));
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cnv->redraw();
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}
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void zoom_out(canvas *cnv, double zoom_factor)
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{
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point2d const zoom_point = cnv->get_camera().get_world().center();
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rectangle const world = cnv->get_camera().get_world();
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cnv->get_camera().set_world(zoom_out_world(zoom_point, world, zoom_factor));
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cnv->redraw();
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}
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void zoom_out(canvas *cnv, point2d zoom_point, double zoom_factor)
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{
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zoom_point = cnv->get_camera().widget_to_world(zoom_point);
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rectangle const world = cnv->get_camera().get_world();
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cnv->get_camera().set_world(zoom_out_world(zoom_point, world, zoom_factor));
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cnv->redraw();
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}
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void zoom_fit(canvas *cnv, rectangle region)
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{
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cnv->get_camera().set_world(region);
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cnv->redraw();
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}
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void translate(canvas *cnv, double dx, double dy)
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{
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rectangle new_world = cnv->get_camera().get_world();
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new_world += ezgl::point2d(dx, dy);
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cnv->get_camera().set_world(new_world);
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cnv->redraw();
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}
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void translate_up(canvas *cnv, double translate_factor)
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{
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rectangle new_world = cnv->get_camera().get_world();
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double dy = new_world.height() / translate_factor;
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translate(cnv, 0.0, dy);
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}
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void translate_down(canvas *cnv, double translate_factor)
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{
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rectangle new_world = cnv->get_camera().get_world();
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double dy = new_world.height() / translate_factor;
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translate(cnv, 0.0, -dy);
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}
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void translate_left(canvas *cnv, double translate_factor)
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{
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rectangle new_world = cnv->get_camera().get_world();
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double dx = new_world.width() / translate_factor;
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translate(cnv, -dx, 0.0);
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}
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void translate_right(canvas *cnv, double translate_factor)
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{
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rectangle new_world = cnv->get_camera().get_world();
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double dx = new_world.width() / translate_factor;
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translate(cnv, dx, 0.0);
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}
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}
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