leaf.cpp

此文档是用vistual studio 2005 开发的用来描述3D-tree 的生长过程

#include "stdafx.h"
#include "Leaf.h"
#include "ChGL.h"
#include <GL/glut.h>


Leaf::Leaf( float size, float twist, float expand, char* bmpPath ) {
	// scales = 0.5f;
	this->size = size;
	this->twist = twist;
	this->expand = expand + 10;
	this->visible = true;
	this->shakeble = false;

	ChGL::loadTexture( bmpPath, &texture, true );
}

Leaf::~Leaf() {
}

void Leaf::draw() {
	glBindTexture( GL_TEXTURE_2D, texture );
	int randExpand = 0;
	int randTwist = 0;
	glPushMatrix();
		//glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_TRUE );
		//glDisable( GL_DEPTH_TEST );
		glEnable( GL_BLEND ); // Enable Blending (disable alpha testing)
		glBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA );
		glBindTexture( GL_TEXTURE_2D, texture );

		if ( shakeble == true &&  ( rand() % 10 < 1 ) ) {
			randExpand = 5 -rand() % 10;
		}
		if ( shakeble == true && ( rand() % 10 < 1 ) ) {
			randTwist = 5 - rand() % 10;
		}
		glRotatef( randExpand, 1.0f, 0.0f, 0.0f );
		glRotatef( randTwist, 0.0f, 1.0f, 0.0f );

		glBegin( GL_QUADS );
			glNormal3f( 1.0f, -1.0f, 1.0f );
			glTexCoord2f( 1.0f, 0.0f );
			glVertex3f( size, 0.0f, 0.0f );
			glNormal3f( 1.0f, 1.0f, 1.0f );
			glTexCoord2f( 1.0f, 1.0f );
			glVertex3f( size, size * 2, 0.0f );
			glNormal3f( -1.0f, 1.0f, 1.0f );
			glTexCoord2f( 0.0f, 1.0f );
			glVertex3f( -size, size * 2, 0.0f );
			glNormal3f( -1.0f, -1.0f, 1.0f );
			glTexCoord2f( 0.0f, 0.0f );
			glVertex3f( -size, 0.0f, 0.0f );
		glEnd();
		glDisable( GL_BLEND );
		//glEnable( GL_DEPTH_TEST );
		//glLightModeli( GL_LIGHT_MODEL_LOCAL_VIEWER, GL_FALSE );
	glPopMatrix();
}

void Leaf::setSize( float size ) {
	this->size = size;
}

void Leaf::setTwist( float twist ) {
	this->twist = twist;
}

void Leaf::setExpand( float expand ) {
	this->expand = expand;
}

void Leaf::setVisible( bool visible ) {
	this->visible = visible;
}

void Leaf::setShakeble( bool shakeble ) {
	this->shakeble = shakeble;
}

void Leaf::setTexture( char *bmpPath ) {
	ChGL::loadTexture( bmpPath, &texture, true );
}

int Leaf::getSize() {
	return size;
}

float Leaf::getTwist() {
	return twist;
}

float Leaf::getExpand() {
	return expand;
}

bool Leaf::isVisible() {
	return visible;
}

bool Leaf::isShakeble() {
	return shakeble;
}

unsigned int Leaf::getTexture() {
	return texture;
}