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Point.cpp
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Point.cpp
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/**
* @file
* @brief Source file for Point class
* @author Jonathan Thomas <jonathan@openshot.org>
*
* @ref License
*/
/* LICENSE
*
* Copyright (c) 2008-2019 OpenShot Studios, LLC
* <http://www.openshotstudios.com/>. This file is part of
* OpenShot Library (libopenshot), an open-source project dedicated to
* delivering high quality video editing and animation solutions to the
* world. For more information visit <http://www.openshot.org/>.
*
* OpenShot Library (libopenshot) is free software: you can redistribute it
* and/or modify it under the terms of the GNU Lesser General Public License
* as published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* OpenShot Library (libopenshot) is distributed in the hope that it will be
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with OpenShot Library. If not, see <http://www.gnu.org/licenses/>.
*/
#include "Point.h"
#include "Exceptions.h"
using namespace std;
using namespace openshot;
// Default constructor
Point::Point() : Point::Point(Coordinate(1, 0), BEZIER, AUTO) {};
// Constructor which creates a single coordinate at X=1
Point::Point(float y) : Point::Point(Coordinate(1, y), CONSTANT, AUTO) {};
// Constructor which creates a Bezier curve with point at (x, y)
Point::Point(float x, float y) : Point::Point(Coordinate(x, y), BEZIER, AUTO) {};
// Constructor which also creates a Point, setting X,Y, and interpolation.
Point::Point(float x, float y, InterpolationType interpolation)
: Point::Point(Coordinate(x, y), interpolation, AUTO) {};
// Direct Coordinate-accepting constructors
Point::Point(const Coordinate& co) : Point::Point(co, BEZIER, AUTO) {};
Point::Point(const Coordinate& co, InterpolationType interpolation)
: Point::Point(co, interpolation, AUTO) {};
Point::Point(const Coordinate& co, InterpolationType interpolation, HandleType handle_type) :
co(co), interpolation(interpolation), handle_type(handle_type) {
// set handles
Initialize_Handles();
}
void Point::Initialize_Handles() {
// initialize left and right handles (in percentages from 0 to 1)
// default to a smooth curve
Initialize_LeftHandle(0.5, 1.0);
Initialize_RightHandle(0.5, 0.0);
}
void Point::Initialize_LeftHandle(float x, float y) {
// initialize left handle (in percentages from 0 to 1)
handle_left = Coordinate(x, y);
}
void Point::Initialize_RightHandle(float x, float y) {
// initialize right handle (in percentages from 0 to 1)
handle_right = Coordinate(x, y);
}
// Generate JSON string of this object
std::string Point::Json() const {
// Return formatted string
return JsonValue().toStyledString();
}
// Generate Json::Value for this object
Json::Value Point::JsonValue() const {
// Create root json object
Json::Value root;
root["co"] = co.JsonValue();
if (interpolation == BEZIER) {
root["handle_left"] = handle_left.JsonValue();
root["handle_right"] = handle_right.JsonValue();
root["handle_type"] = handle_type;
}
root["interpolation"] = interpolation;
// return JsonValue
return root;
}
// Load JSON string into this object
void Point::SetJson(const std::string value) {
// Parse JSON string into JSON objects
try
{
const Json::Value root = openshot::stringToJson(value);
// Set all values that match
SetJsonValue(root);
}
catch (const std::exception& e)
{
// Error parsing JSON (or missing keys)
throw InvalidJSON("JSON is invalid (missing keys or invalid data types)");
}
}
// Load Json::Value into this object
void Point::SetJsonValue(const Json::Value root) {
if (!root["co"].isNull())
co.SetJsonValue(root["co"]); // update coordinate
if (!root["handle_left"].isNull())
handle_left.SetJsonValue(root["handle_left"]); // update coordinate
if (!root["handle_right"].isNull())
handle_right.SetJsonValue(root["handle_right"]); // update coordinate
if (!root["interpolation"].isNull())
interpolation = (InterpolationType) root["interpolation"].asInt();
if (!root["handle_type"].isNull())
handle_type = (HandleType) root["handle_type"].asInt();
}