#include "rectangle.h"

rectangle::rectangle(){
	sizePct     = 0.0f;
	sizeBegin   = 120;
	sizeEnd     = 0;
	sizeShaper = ((rand()%500+1)/50);

	alpha       = 0.0f;
	alphaPct    = 0.0f;
	alphaBegin  = 255;
	alphaEnd    = 0;
	alphaShaper = 4.0f;

	posPct      = 0.0f;
	posShaper   = (rand()%400+201)/60;
}

void rectangle::init(int x, int y){
	sizePct = 0.0f;

	alphaPct = 0.0f;

	posPct = 0.0f;
	posa.x = x;
	posa.y = y;
	posb.x = rand()%ofGetWidth()+1;
	posb.y = (ofGetHeight()/2);
}

void rectangle::draw() {
	ofSetRectMode(OF_RECTMODE_CENTER);
	ofEnableAlphaBlending();
	ofSetColor(255, 0 ,0, alpha);
	ofFill();
	ofRect(pos.x, pos.y, size,size);
	ofDisableAlphaBlending();
}

void rectangle::update(){
	controlSize();
	controlAlpha();
	controlPos();
}

void rectangle::controlSize(){
	if (sizePct < 1) {
		sizePct += 0.025f;
	}
	interpolateSize(sizePct);
};

void rectangle::controlAlpha(){
	if (alphaPct < 1) {
		alphaPct += 0.025f;
	}
	interpolateAlpha(alphaPct);
}

void rectangle::controlPos(){
	if (posPct < 1) {
		posPct += 0.025f;
	}
	interpolatePos(posPct);
}

void rectangle::interpolateSize(float pct){
	pct = powf(pct, sizeShaper);
	size = (1-pct) * sizeBegin + (pct) * sizeEnd;
}

void rectangle::interpolateAlpha(float pct){
	pct = powf(pct, alphaShaper);
	alpha = (1-pct) * alphaBegin + (pct) * alphaEnd;
}

void rectangle::interpolatePos(float pct){
	pct = powf(pct, posShaper);
	pos.x = (1-pct) * posa.x + (pct) * posb.x;
	pos.y = (1-pct) * posa.y + (pct) * posb.y;
}