starting to move to a generic state structure

[chaz/yoink] / src / Character.cc

diff --git a/src/Character.cc b/src/Character.cc
index accad6512ecc4e0ffc185a528bbc495b13a423f6..ffecfd5b8c5db2c2c82c3e4cc478c00d718f3fed 100644 (file)
--- a/src/Character.cc
+++ b/src/Character.cc
@@ -32,15 +32,58 @@
 #include "Log.hh"
 
        
+struct SpringForce
+{
+       explicit SpringForce(Mf::Vector2 x) :
+               location(x) {}
+
+       const Mf::Vector2& operator () (const Mf::LinearState<2>& state)
+       {
+               Mf::Vector2 x = state.position - location;
+               Mf::Scalar mag = x.length();
+               Mf::Scalar d = 50.0;
+
+               // spring:
+               //current.force += -15.0 * x - 1.5 * current.velocity;
+               force = -20.0 * (mag - d) * (x / mag) - 2.0 * state.velocity;
+
+               return force;
+       }
+
+private:
+
+       Mf::Vector2 force;
+       Mf::Vector2 location;
+};
+
+struct WindResistenceForce
+{
+       const Mf::Vector2& operator () (const Mf::LinearState<2>& state)
+       {
+               force = -2.0 * state.velocity;
+               return force;
+       }
+
+private:
+
+       Mf::Vector2 force;
+};
+
+
 Character::Character(const std::string& name) :
        tilemap_(name),
        animation_(name)
 {
+       current.init();
+
        current.mass = 1.0;
        current.inverseMass = 1.0 / current.mass;
 
        // gravity
-       current.force = Mf::Vector2(0.0, -120.0);
+       current.force = Mf::Vector2(0.0, 000.0);
+       current.forces.push_back(SpringForce(Mf::Vector2(500.0, 200.0)));
+       current.forces.push_back(WindResistenceForce());
+       current.forces.push_back(Mf::LinearState<2>::GravityForce(-2000.0));
 
        // starting position
        current.position = Mf::Vector2(64.0, 64.0);
@@ -55,21 +98,25 @@ void Character::update(Mf::Scalar t, Mf::Scalar dt)
 {
        previous = current;
 
-       Mf::Vector2 x = current.position - Mf::Vector2(500.0, 200.0);
-       Mf::Scalar mag = x.length();
-       Mf::Scalar d = 50.0;
-
-       // gravity:
-       current.force = Mf::Vector2(0.0, -2000.0);
-       // spring:
-       //current.force += -15.0 * x - 1.5 * current.velocity;
-       current.force += -20.0 * (mag - d) * (x / mag) - 2.0 * current.velocity;
-       // internal:
-       current.force += userForce;
-       current.recalculate();
+       //Mf::Vector2 x = current.position - Mf::Vector2(500.0, 200.0);
+       //Mf::Scalar mag = x.length();
+       //Mf::Scalar d = 50.0;
+
+       //// gravity:
+       //current.force = Mf::Vector2(0.0, -2000.0);
+       //// spring:
+       ////current.force += -15.0 * x - 1.5 * current.velocity;
+       //current.force += -20.0 * (mag - d) * (x / mag) - 2.0 * current.velocity;
+       //// internal:
+       //current.force += userForce;
+       //current.recalculate();
        //std::cout << "force: " << current.momentum << std::endl;
 
-       Mf::euler<State,Derivative>(current, t, dt);
+       //Mf::euler<State,Derivative>(current, t, dt);
+
+       //current.force = Mf::Vector2(0.0, -2000.0);
+       current.force = userForce;
+       current.integrate(t, dt);
 
        animation_.update(t, dt);
 }
@@ -77,7 +124,7 @@ void Character::update(Mf::Scalar t, Mf::Scalar dt)
 
 void Character::draw(Mf::Scalar alpha) const
 {
-       State state = cml::lerp(previous, current, alpha);
+       Mf::Vector2 position = cml::lerp(previous.position, current.position, alpha);
 
        //glColor3f(1.0f, 1.0f, 1.0f);
        tilemap_.bind();
@@ -95,13 +142,13 @@ void Character::draw(Mf::Scalar alpha) const
 
        glBegin(GL_TRIANGLE_FAN);
                glTexCoord2f(coords[0], coords[1]);
-               glVertex3(state.position[0]-s, state.position[1]-s, z);
+               glVertex3(position[0]-s, position[1]-s, z);
                glTexCoord2f(coords[2], coords[3]);
-               glVertex3(state.position[0]+s, state.position[1]-s, z);
+               glVertex3(position[0]+s, position[1]-s, z);
                glTexCoord2f(coords[4], coords[5]);
-               glVertex3(state.position[0]+s, state.position[1]+s, z);
+               glVertex3(position[0]+s, position[1]+s, z);
                glTexCoord2f(coords[6], coords[7]);
-               glVertex3(state.position[0]-s, state.position[1]+s, z);
+               glVertex3(position[0]-s, position[1]+s, z);
        glEnd();
 
        //glColor3f(0.0f, 0.0f, 0.0f);