import javax.media.opengl.*;

/**
 * The Tanks
 */
class Tank {

  // position, orientation and velocity
  double currentAngle = 0;
  float  x = 0;
  float  y = 0;
  float  z = 0;
  double velocity = 0;

  public Tank() {
  }

  public double getVelocity() {
    return velocity;
  }

  public void setVelocity(double velocity) {
    this.velocity = velocity;
  }

  // move the tank making sure it stays on the floor
  public void translate(float x, float y, float z) {
    this.x += x;
    if (this.x < -1000) this.x = -1000;
    if (this.x > 1000) this.x = 1000;
    this.y += y;
    this.z += z;
    if (this.z < -1000) this.z = -1000;
    if (this.z > 1000) this.z = 1000;
  }

  // rotates the tank of 'angle' degrees
  public void rotate(double angle) {
    currentAngle = (currentAngle + angle) % 360.0;
  }

  // updates the tank depending on its velocity
  public void update(double time) {
    if (velocity != 0) {
      float dx = (float) (velocity * time * Math.cos(currentAngle / 180.0f * Math.PI));
      float dz = (float) (velocity * time * Math.sin(currentAngle / 180.0f * Math.PI));
      translate(dx, 0, - dz);
    }
  }

  // Draws the tank
  public void draw(GL gl) {
	// transformation matrix
    	gl.glPushMatrix();
    	gl.glTranslatef(x, y, z);
    	// this is to take care of the tank modelisation
    	gl.glRotatef(-90.0f, 1.0f, 0.0f, 0.0f);
    	gl.glRotatef((float)currentAngle, 0.0f, 0.0f, 1.0f);

      // draw the turret
      gl.glColor3f(0.9f,0.9f,0.2f);
      gl.glShadeModel(gl.GL_FLAT);
      gl.glBegin(gl.GL_TRIANGLE_STRIP);
    		gl.glNormal3f(0.991228f, 0.000000f, -0.132164f);
		gl.glTexCoord2f(0.107f, -0.009f);
		gl.glVertex3f(1.480f, -0.516f, 1.040f);
                gl.glTexCoord2f(0.617f, -0.559f);
                gl.glVertex3f(1.480f, 0.516f, 1.040f);
                gl.glTexCoord2f(0.224f, -0.178f);
                gl.glVertex3f(1.580f, -0.434f, 1.790f);
                gl.glTexCoord2f(0.457f, -0.429f);
                gl.glVertex3f(1.580f, 0.435f, 1.790f);
                gl.glNormal3f(0.087795f, 0.000000f, 0.996139f);
                gl.glTexCoord2f(0.866f, 0.402f);
                gl.glVertex3f(-1.370f, -0.765f, 2.050f);
                gl.glTexCoord2f(1.080f, 0.169f);
                gl.glVertex3f(-1.370f, 0.764f, 2.050f);
                gl.glNormal3f(-0.741466f, 0.000000f, -0.670990f);
                gl.glTexCoord2f(0.559f, 0.339f);
                gl.glVertex3f(-0.456f, -1.060f, 1.040f);
                gl.glTexCoord2f(0.996f, -0.132f);
                gl.glVertex3f(-0.456f, 1.080f, 1.040f);
      gl.glEnd();
      gl.glShadeModel(gl.GL_SMOOTH);
      gl.glBegin(gl.GL_TRIANGLE_FAN);
                gl.glNormal3f(0.183504f, -0.940289f, 0.286676f);
                gl.glTexCoord2f(0.559f, 0.339f);
                gl.glVertex3f(-0.456f, -1.060f, 1.040f);
                gl.glNormal3f(0.269870f, -0.960420f, 0.069023f);
                gl.glTexCoord2f(0.107f, -0.009f);
                gl.glVertex3f(1.480f, -0.516f, 1.040f);
                gl.glNormal3f(0.136533f, -0.910814f, 0.389585f);
                gl.glTexCoord2f(0.224f, -0.178f);
                gl.glVertex3f(1.580f, -0.434f, 1.790f);
                gl.glTexCoord2f(0.866f, 0.402f);
                gl.glVertex3f(-1.370f, -0.765f, 2.050f);
      gl.glEnd();
      gl.glBegin(gl.GL_TRIANGLE_FAN);
              gl.glNormal3f(0.235235f, 0.954665f, 0.182426f);
              gl.glTexCoord2f(0.996f, -0.132f);
              gl.glVertex3f(-0.456f, 1.080f, 1.040f);
              gl.glNormal3f(0.136569f, 0.903492f, 0.406265f);
              gl.glTexCoord2f(1.080f, 0.169f);
              gl.glVertex3f(-1.370f, 0.764f, 2.050f);
              gl.glNormal3f(0.279081f, 0.957980f, 0.066251f);
              gl.glTexCoord2f(0.457f, -0.429f);
              gl.glVertex3f(1.580f, 0.435f, 1.790f);
              gl.glTexCoord2f(0.617f, -0.559f);
              gl.glVertex3f(1.480f, 0.516f, 1.040f);
      gl.glEnd();

      // draw the body
      gl.glColor3f(0.8f,0.8f,0.2f);
      gl.glBegin(gl.GL_TRIANGLE_STRIP);
              gl.glNormal3f(0.023598f, 0.000000f, 0.999722f);
              gl.glTexCoord2f(1.360f, 1.970f);
              gl.glVertex3f(2.575f, -0.877f, 1.111f);
              gl.glTexCoord2f(0.822f, 1.710f);
              gl.glVertex3f(2.575f, 0.877f, 1.111f);
              gl.glTexCoord2f(2.030f, 0.541f);
              gl.glVertex3f(-2.835f, -0.877f, 1.238f);
              gl.glTexCoord2f(1.490f, 0.289f);
              gl.glVertex3f(-2.835f, 0.877f, 1.238f);
              gl.glNormal3f(-0.898134f, 0.000000f, -0.439723f);
              gl.glTexCoord2f(1.840f, 0.932f);
              gl.glVertex3f(-2.229f, -0.877f, 0.000f);
              gl.glTexCoord2f(1.310f, 0.680f);
              gl.glVertex3f(-2.229f, 0.877f, 0.000f);
              gl.glNormal3f(0.000000f, 0.000000f, -1.000000f);
              gl.glTexCoord2f(1.350f, 1.980f);
              gl.glVertex3f(2.430f, -0.877f, 0.000f);
              gl.glTexCoord2f(0.815f, 1.730f);
              gl.glVertex3f(2.430f, 0.877f, 0.000f);
              gl.glNormal3f(0.991585f, 0.000000f, -0.129459f);
              gl.glTexCoord2f(1.360f, 1.970f);
              gl.glVertex3f(2.575f, -0.877f, 1.111f);
              gl.glTexCoord2f(0.822f, 1.710f);
              gl.glVertex3f(2.575f, 0.877f, 1.111f);
      gl.glEnd();

      gl.glColor3f(0.3f,0.3f,0.3f);

      // left tread
      gl.glShadeModel(gl.GL_FLAT);
      gl.glBegin(gl.GL_TRIANGLE_STRIP);
              gl.glNormal3f(0.020362f, 0.000000f, 0.999793f);
              gl.glTexCoord2f(0.033f, 0.684f);
              gl.glVertex3f(2.730f, 0.877f, 1.294f);
              gl.glTexCoord2f(0.095f, 0.570f);
              gl.glVertex3f(2.730f, 1.400f, 1.294f);
              gl.glTexCoord2f(0.759f, 1.070f);
              gl.glVertex3f(-2.970f, 0.877f, 1.410f);
              gl.glTexCoord2f(0.813f, 0.970f);
              gl.glVertex3f(-2.970f, 1.400f, 1.410f);
              gl.glNormal3f(-0.885132f, 0.000000f, -0.465341f);
              gl.glTexCoord2f(0.375f, 1.300f);
              gl.glVertex3f(-2.229f, 0.877f, 0.000f);
              gl.glTexCoord2f(0.800f, 0.523f);
              gl.glVertex3f(-2.229f, 1.400f, 0.000f);
              gl.glNormal3f(0.000000f, 0.000000f, -1.000000f);
              gl.glTexCoord2f(-0.156f, 1.010f);
              gl.glVertex3f(2.597f, 0.877f, 0.000f);
              gl.glTexCoord2f(0.268f, 0.233f);
              gl.glVertex3f(2.597f, 1.400f, 0.000f);
              gl.glNormal3f(0.994712f, 0.000000f, -0.102699f);
              gl.glTexCoord2f(0.033f, 0.684f);
              gl.glVertex3f(2.730f, 0.877f, 1.294f);
              gl.glTexCoord2f(0.095f, 0.570f);
              gl.glVertex3f(2.730f, 1.400f, 1.294f);
      gl.glEnd();
      gl.glShadeModel(gl.GL_FLAT);
      gl.glBegin(gl.GL_TRIANGLE_FAN);
              gl.glNormal3f(0.000000f, -1.000000f, 0.000000f);
              gl.glTexCoord2f(0.375f, 1.300f);
              gl.glVertex3f(-2.229f, 0.877f, 0.000f);
              gl.glTexCoord2f(-0.156f, 1.010f);
              gl.glVertex3f(2.597f, 0.877f, 0.000f);
              gl.glTexCoord2f(0.033f, 0.684f);
              gl.glVertex3f(2.730f, 0.877f, 1.294f);
              gl.glTexCoord2f(0.759f, 1.070f);
              gl.glVertex3f(-2.970f, 0.877f, 1.410f);
      gl.glEnd();
      gl.glBegin(gl.GL_TRIANGLE_FAN);
              gl.glNormal3f(0.000000f, 1.000000f, 0.000000f);
              gl.glTexCoord2f(0.800f, 0.523f);
              gl.glVertex3f(-2.229f, 1.400f, 0.000f);
              gl.glTexCoord2f(0.813f, 0.970f);
              gl.glVertex3f(-2.970f, 1.400f, 1.410f);
              gl.glTexCoord2f(0.095f, 0.570f);
              gl.glVertex3f(2.730f, 1.400f, 1.294f);
              gl.glTexCoord2f(0.268f, 0.233f);
              gl.glVertex3f(2.597f, 1.400f, 0.000f);
      gl.glEnd();

      // right tread
      gl.glShadeModel(gl.GL_FLAT);
      gl.glBegin(gl.GL_TRIANGLE_STRIP);
              gl.glNormal3f(0.020362f, 0.000000f, 0.999793f);
              gl.glTexCoord2f(-0.072f, 0.099f);
              gl.glVertex3f(2.730f, -1.400f, 1.294f);
              gl.glTexCoord2f(0.032f, 0.022f);
              gl.glVertex3f(2.730f, -0.875f, 1.294f);
              gl.glTexCoord2f(0.419f, 0.757f);
              gl.glVertex3f(-2.970f, -1.400f, 1.410f);
              gl.glTexCoord2f(0.511f, 0.690f);
              gl.glVertex3f(-2.970f, -0.875f, 1.410f);
              gl.glNormal3f(-0.885132f, 0.000000f, -0.465341f);
              gl.glTexCoord2f(-0.026f, 0.803f);
              gl.glVertex3f(-2.229f, -1.400f, 0.000f);
              gl.glTexCoord2f(0.690f, 0.279f);
              gl.glVertex3f(-2.229f, -0.875f, 0.000f);
              gl.glNormal3f(0.000000f, 0.000000f, -1.000000f);
              gl.glTexCoord2f(-0.383f, 0.314f);
              gl.glVertex3f(2.597f, -1.400f, 0.000f);
              gl.glTexCoord2f(0.332f, -0.209f);
              gl.glVertex3f(2.597f, -0.875f, 0.000f);
              gl.glNormal3f(0.994712f, 0.000000f, -0.102699f);
              gl.glTexCoord2f(-0.072f, 0.099f);
              gl.glVertex3f(2.730f, -1.400f, 1.294f);
              gl.glTexCoord2f(0.032f, 0.022f);
              gl.glVertex3f(2.730f, -0.875f, 1.294f);
      gl.glEnd();
      gl.glBegin(gl.GL_TRIANGLE_FAN);
              gl.glNormal3f(0.000000f, -1.000000f, 0.000000f);
              gl.glTexCoord2f(-0.026f, 0.803f);
              gl.glVertex3f(-2.229f, -1.400f, 0.000f);
              gl.glTexCoord2f(-0.383f, 0.314f);
              gl.glVertex3f(2.597f, -1.400f, 0.000f);
              gl.glTexCoord2f(-0.072f, 0.099f);
              gl.glVertex3f(2.730f, -1.400f, 1.294f);
              gl.glTexCoord2f(0.419f, 0.757f);
              gl.glVertex3f(-2.970f, -1.400f, 1.410f);
      gl.glEnd();
      gl.glBegin(gl.GL_TRIANGLE_FAN);
              gl.glNormal3f(0.000000f, 1.000000f, 0.000000f);
              gl.glTexCoord2f(0.690f, 0.279f);
              gl.glVertex3f(-2.229f, -0.875f, 0.000f);
              gl.glTexCoord2f(0.511f, 0.690f);
              gl.glVertex3f(-2.970f, -0.875f, 1.410f);
              gl.glTexCoord2f(0.032f, 0.022f);
              gl.glVertex3f(2.730f, -0.875f, 1.294f);
              gl.glTexCoord2f(0.332f, -0.209f);
              gl.glVertex3f(2.597f, -0.875f, 0.000f);
      gl.glEnd();

      // barrel
      gl.glColor3f(0.1f,0.1f,0.1f);

      gl.glShadeModel(gl.GL_SMOOTH);
      gl.glBegin(gl.GL_TRIANGLE_STRIP);
              gl.glNormal3f(0.0f, -1.0f, 0.0f);
              gl.glVertex3f(1.570f, -0.18f, 1.530f);
              gl.glVertex3f(4.940f, -0.126f, 1.530f);
              gl.glNormal3f(0.0f, 0.0f, 1.0f);
              gl.glVertex3f(1.570f, 0.0f, 1.710f);
              gl.glVertex3f(4.940f, 0.0f, 1.660f);
              gl.glNormal3f(0.0f, 1.0f, 0.0f);
              gl.glVertex3f(1.570f, 0.18f, 1.530f);
              gl.glVertex3f(4.940f, 0.126f, 1.530f);
              gl.glNormal3f(0.0f, 0.0f, -1.0f);
              gl.glVertex3f(1.570f, 0.0f, 1.350f);
              gl.glVertex3f(4.940f, 0.0f, 1.410f);
              gl.glNormal3f(0.0f, -1.0f, 0.0f);
              gl.glVertex3f(1.570f, -0.18f, 1.530f);
              gl.glVertex3f(4.940f, -0.126f, 1.530f);
      gl.glEnd();
      gl.glShadeModel(gl.GL_FLAT);
      gl.glBegin(gl.GL_TRIANGLE_FAN);
              gl.glNormal3f(1.000000f, 0.000000f, 0.000000f);
              gl.glVertex3f(4.940f, 0.0f, 1.410f);
              gl.glVertex3f(4.940f, 0.126f, 1.530f);
              gl.glVertex3f(4.940f, 0.0f, 1.660f);
              gl.glVertex3f(4.940f, -0.126f, 1.530f);
      gl.glEnd();

      gl.glPopMatrix();
  }
}