Point.cpp

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// Copyright (c) 2008-2019 OpenShot Studios, LLC
//
// SPDX-License-Identifier: LGPL-3.0-or-later
 
#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();
 
}