ofxPiMapper/src/Surfaces/TriangleSurface.cpp

#include "TriangleSurface.h"

namespace ofx {
namespace piMapper {
TriangleSurface::TriangleSurface() {
  setup();
}

TriangleSurface::~TriangleSurface() {}

void TriangleSurface::setup() {
  // Create 3 points for the triangle
  ofVec2f p1 = ofVec2f(ofGetWidth() / 2.0f, 0);
  ofVec2f p2 = ofVec2f(ofVec2f(0, ofGetHeight()));
  ofVec2f p3 = ofVec2f(ofGetWidth(), ofGetHeight());

  // Create 3 point for the texture coordinates
  ofVec2f t1 = ofVec2f(0.5f, 0);
  ofVec2f t2 = ofVec2f(0, 1.0f);
  ofVec2f t3 = ofVec2f(1, 1.0f);

  setup(p1, p2, p3, t1, t2, t3, source);
}

void TriangleSurface::setup(ofVec2f p1, ofVec2f p2, ofVec2f p3, ofVec2f t1,
                            ofVec2f t2, ofVec2f t3, BaseSource* newSource) {
  // Assign texture
  source = newSource;

  // Clear mesh
  mesh.clear();

  // Create a surface with the points
  mesh.addVertex(p1);
  mesh.addVertex(p2);
  mesh.addVertex(p3);

  // Add texture coordinates
  mesh.addTexCoord(t1);
  mesh.addTexCoord(t2);
  mesh.addTexCoord(t3);
}

void TriangleSurface::draw() {
  if (source->getTexture() == NULL) {
    ofLogWarning("TriangleSurface") << "Source texture is empty. Not drawing.";
    return;
  }
  
  source->getTexture()->bind();
  mesh.draw();
  source->getTexture()->unbind();
}

void TriangleSurface::setVertex(int index, ofVec2f p) {
  if (index > 2) {
    ofLog() << "Vertex with this index does not exist: " << index << endl;
    return;
  }

  mesh.setVertex(index, p);
}

void TriangleSurface::setTexCoord(int index, ofVec2f t) {
  if (index > 2) {
    ofLog() << "Texture coordinate with this index does not exist: " << index
            << endl;
    return;
  }

  mesh.setTexCoord(index, t);
}

void TriangleSurface::moveBy(ofVec2f v) {
  vector<ofVec3f>& vertices = getVertices();
  for (int i = 0; i < vertices.size(); i++) {
    vertices[i] += v;
  }
}

int TriangleSurface::getType() { return SurfaceType::TRIANGLE_SURFACE; }

bool TriangleSurface::hitTest(ofVec2f p) {
  // Construct ofPolyline from vertices
  ofPolyline line = getHitArea();

  if (line.inside(p.x, p.y)) {
    return true;
  } else {
    return false;
  }
}

ofVec2f TriangleSurface::getVertex(int index) {
  if (index > 2) {
    ofLog() << "Vertex with this index does not exist: " << index << endl;
    throw std::runtime_error("Vertex index out of bounds.");
  }

  ofVec3f vert = mesh.getVertex(index);
  return ofVec2f(vert.x, vert.y);
}

ofVec2f TriangleSurface::getTexCoord(int index) {
  if (index > 2) {
    throw std::runtime_error("Texture coordinate index out of bounds.");
  }

  return mesh.getTexCoord(index);
}

ofPolyline TriangleSurface::getHitArea() {
  ofPolyline line;
  line.addVertex(ofPoint(mesh.getVertex(0).x, mesh.getVertex(0).y));
  line.addVertex(ofPoint(mesh.getVertex(1).x, mesh.getVertex(1).y));
  line.addVertex(ofPoint(mesh.getVertex(2).x, mesh.getVertex(2).y));
  line.close();

  return line;
}

ofPolyline TriangleSurface::getTextureHitArea() {
  ofPolyline line;
  vector<ofVec2f>& texCoords = mesh.getTexCoords();
  ofVec2f textureSize = ofVec2f(source->getTexture()->getWidth(), source->getTexture()->getHeight());
  for (int i = 0; i < texCoords.size(); i++) {
    line.addVertex(ofPoint(texCoords[i] * textureSize));
  }
  line.close();

  return line;
}

vector<ofVec3f>& TriangleSurface::getVertices() {
  // return only joint vertices
  return mesh.getVertices();
}

vector<ofVec2f>& TriangleSurface::getTexCoords() { return mesh.getTexCoords(); }
}
}