Step 7.13: EMBind CPP line

DAB0mB · Aug 29, 2018 · c8adc13 · c8adc13
1 parent e7d5784
commit c8adc13
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diff --git a/resources/cpp/post.js b/resources/cpp/post.js
@@ -4,6 +4,10 @@ return {
     trim: Module.utils_trim,
     isBetween: Module.utils_isBetween,
     compare: Module.utils_compare
+  },
+
+  Geometry: {
+    Line: Module.geometry_line
   }
 };
 

diff --git a/resources/cpp/src/geometry/line.cpp b/resources/cpp/src/geometry/line.cpp
@@ -1,3 +1,6 @@
+#include <vector>
+#include <emscripten/bind.h>
+#include <emscripten/val.h>
 #include "../nullable.h"
 #include "../utils.h"
 #include "point.h"
@@ -96,4 +99,52 @@ namespace geometry {
 
     return Nullable<Point>();
   }
+
+  emscripten::val EMLine::getMatchingX(double y) {
+    Nullable<double> nullableX = Line::getMatchingX(y);
+    return nullableX.hasValue() ?
+      emscripten::val(nullableX.getValue()) :
+      emscripten::val::undefined();
+  }
+
+  emscripten::val EMLine::getMatchingY(double x) {
+    Nullable<double> nullableY = Line::getMatchingY(x);
+    return nullableY.hasValue() ?
+      emscripten::val(nullableY.getValue()) :
+      emscripten::val::undefined();
+  }
+
+  emscripten::val EMLine::getIntersection(EMLine emLine) {
+    Line line = Line(emLine._x1, emLine._y1, emLine._x2, emLine._y2);
+    Nullable<Point> nullablePoint = Line::getIntersection(line);
+
+    if (nullablePoint.isNull()) return emscripten::val::undefined();
+
+    Point point = nullablePoint.getValue();
+    emscripten::val emPoint = emscripten::val::object();
+    emPoint.set("x", emscripten::val(point.x));
+    emPoint.set("y", emscripten::val(point.y));
+    return emPoint;
+  }
+}
+
+EMSCRIPTEN_BINDINGS(geometry_line_module) {
+  emscripten::class_<geometry::Line>("geometry_line_base")
+    .constructor<double, double, double, double>()
+    .property<double>("x1", &geometry::Line::_x1)
+    .property<double>("y1", &geometry::Line::_y1)
+    .property<double>("x2", &geometry::Line::_x2)
+    .property<double>("y2", &geometry::Line::_y2)
+    .function("hasPoint", &geometry::Line::hasPoint)
+    .function("boundsHavePoint", &geometry::Line::boundsHavePoint);
+
+  emscripten::class_<geometry::EMLine, emscripten::base<geometry::Line>>("geometry_line")
+    .constructor<double, double, double, double>()
+    .function("getX", &geometry::EMLine::getMatchingX)
+    .function("getY", &geometry::EMLine::getMatchingY)
+    .function("getLineIntersection",
+      emscripten::select_overload<emscripten::val(geometry::EMLine)>(
+        &geometry::EMLine::getIntersection
+      )
+    );
 }
diff --git a/resources/cpp/src/geometry/line.h b/resources/cpp/src/geometry/line.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <vector>
+#include <emscripten/val.h>
 #include "../nullable.h"
 #include "point.h"
 
@@ -27,4 +28,15 @@ namespace geometry {
 
     Nullable<Point> getIntersection(Line line);
   };
+
+  class EMLine : public Line {
+  public:
+    using Line::Line;
+
+    emscripten::val getMatchingX(double y);
+
+    emscripten::val getMatchingY(double x);
+
+    emscripten::val getIntersection(EMLine line);
+  };
 }