animrect.cpp

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#include "animrect.h"
#include <assert.h>
#include <stdio.h>


AnimRect::AnimRect()
	: m_frames(1)
	, m_actframe(1) {
}

void AnimRect::set(const QRect &a, const QRect &b, int frames) {
	m_a= a;
	m_b= b;
	m_frames= frames;
	m_actframe= 0;
		
	assert(m_frames > 0);
}

QRect AnimRect::currentFrame() const {
	return calcFrame(m_actframe);
}

QRect AnimRect::nextFrame() {
	if(!framesLeft()) {
		return m_b;
	} else {
		return calcFrame(m_actframe++);
	}
}

QRect AnimRect::lastFrame() const {
	return m_b;
}

QRect AnimRect::nextHull() const {
	if(m_actframe <= 0) {
		return m_a;
//	} else if(!framesLeft()) {
//		return m_b;
	} else {
		return calcFrame(m_actframe - 1) | calcFrame(m_actframe);
	}
}

QRect AnimRect::calcFrame(int frame) const {
//printf("a AnimRect::calcFrame(%i) of %i\n", frame, m_frames);
	if(frame >= m_frames || m_frames == 1) return m_b;

	int x1, y1, w1, h1;
	int x2, y2, w2, h2;
	m_a.rect(&x1, &y1, &w1, &h1);
	m_b.rect(&x2, &y2, &w2, &h2);

	int a= m_frames - frame - 1;
	int b= frame;

	int x= (a* x1 + b* x2)/ (m_frames - 1);
	int y= (a* y1 + b* y2)/ (m_frames - 1);
	int w= (a* w1 + b* w2)/ (m_frames - 1);
	int h= (a* h1 + b* h2)/ (m_frames - 1);
//printf("b AnimRect::calcFrame %i\n", QRect(x, y, w, h) == m_a);
	return QRect(x, y, w, h);
}

bool AnimRect::framesLeft() const {
	return m_actframe < m_frames;
}