C++ VPoint::setPos方法代码示例

void VRope::createRope(cocos2d::CCPoint pointA, cocos2d::CCPoint pointB, float ropeLenght) {
    
    float distance;
    if (ropeLenght < 0) {
        distance = ccpDistance(pointA,pointB);
    }else{
        distance = ropeLenght;
    }
    
	int segmentFactor = RopeSegmentFactor; //increase value to have less segments per rope, decrease to have more segments
	numPoints = distance/segmentFactor;
    
    mRopeLength = segmentFactor * numPoints;
    
	CCPoint diffVector = ccpSub(pointB,pointA);
	float multiplier = distance / (numPoints-1);
	antiSagHack = 0.1f; //HACK: scale down rope points to cheat sag. set to 0 to disable, max suggested value 0.1
    
	for(int i=0;i<numPoints;i++) {
		CCPoint tmpVector = ccpAdd(pointA, ccpMult(ccpNormalize(diffVector),multiplier*i*(1-antiSagHack)));
		VPoint* tmpPoint = new VPoint;
        tmpPoint->setPos(tmpVector.x, tmpVector.y);
        vPoints.insert(vPoints.end(), tmpPoint);
	}
    
	for(int i=0;i<numPoints-1;i++) {
        VStick tmpStick;
        tmpStick.initWith(vPoints[i], vPoints[i+1]);
		vSticks.insert(vSticks.end(), tmpStick);
	}
    
	if(spriteSheet!=NULL) {
		for(int i=0;i<numPoints-1;i++) {
            VPoint* point1 = vSticks[i].getPointA();
            VPoint* point2 = vSticks[i].getPointB();
			CCPoint stickVector = ccpSub(ccp(point1->x,point1->y),ccp(point2->x,point2->y));
			float stickAngle = ccpToAngle(stickVector);
            
            CCTexture2D* texture = spriteSheet->getTexture();
            RecordSprite* tmpSprite = new RecordSprite;
			tmpSprite->setTag(Tag_Box_RopeBatchSprite);
			tmpSprite->autorelease();
			tmpSprite->initWithTexture(texture, CCRectMake(0,0,multiplier,texture->getContentSize().height));
			ccTexParams params = {GL_LINEAR,GL_LINEAR,GL_REPEAT,GL_REPEAT};
            tmpSprite->getTexture()->setTexParameters(&params);
            tmpSprite->setPosition(ccpMidpoint(ccp(point1->x,point1->y),ccp(point2->x,point2->y)));
            tmpSprite->setRotation(-1 * CC_RADIANS_TO_DEGREES(stickAngle));
            spriteSheet->addChild(tmpSprite);
            ropeSprites.insert(ropeSprites.end(), tmpSprite);
		}

		//// LiFeng 添加
		//ropeSprites[ropeSprites.size()-1]->setOpacity(100);
	}else{
        CCAssert(false, "not init");
    }
    
}

void VRope::resetWithPoints(cocos2d::CCPoint pointA, cocos2d::CCPoint pointB) {
	float distance = ccpDistance(pointA,pointB);
	CCPoint diffVector = ccpSub(pointB,pointA);
	float multiplier = distance / (numPoints - 1);
	for(int i=0;i<numPoints;i++) {
		CCPoint tmpVector = ccpAdd(pointA, ccpMult(ccpNormalize(diffVector),multiplier*i*(1-antiSagHack)));
        VPoint* tmpPoint = vPoints[i];
        tmpPoint->setPos(tmpVector.x, tmpVector.y);
		
	}
}

VRope* VRope::cutRopeInStick(int nPoint, VStick* stick, b2Body* newBodyA, b2Body* newBodyB) {
    auto range = NSRange{nPoint, numPoints-nPoint-1};
    
    std::vector< VStick *> newRopeSticks( vSticks.begin() + range.location, vSticks.begin() + range.location + range.length );
    vSticks.erase(vSticks.begin() + range.location, vSticks.begin() + range.location + range.length);
    
    std::vector<Sprite*> newRopeSprites(ropeSprites.begin() + range.location, ropeSprites.begin() + range.location + range.length);
    ropeSprites.erase(ropeSprites.begin() + range.location, ropeSprites.begin() + range.location + range.length);
    
    range.length += 1;

    std::vector<VPoint*> newRopePoints(vPoints.begin() + range.location, vPoints.begin() + range.location + range.length);
    vPoints.erase(vPoints.begin() + range.location, vPoints.begin() + range.location + range.length);

    VPoint *pointOfBreak = newRopePoints.at(0);
    VPoint *newPoint = new VPoint();
    newPoint->setPos(pointOfBreak->x, pointOfBreak->y);
    vPoints.push_back(newPoint);

    VStick *lastStick = vSticks.back();
    lastStick->setPointB(newPoint);
 
    float cutRatio = (float)nPoint / (numPoints - 1);
    numPoints = nPoint + 1;

    b2Vec2 newBodiesPosition  = b2Vec2(pointOfBreak->x / PTM_RATIO, pointOfBreak->y / PTM_RATIO);

    b2World *world = newBodyA->GetWorld();

    b2RopeJointDef jd;
    jd.bodyA = joint->GetBodyA();
    jd.bodyB = newBodyB;
    jd.localAnchorA = joint->GetLocalAnchorA();
    jd.localAnchorB = b2Vec2(0, 0);
    jd.maxLength = joint->GetMaxLength() * cutRatio;
    newBodyB->SetTransform(newBodiesPosition, 0.0);
    b2RopeJoint *newJoint1 = (b2RopeJoint *)world->CreateJoint(&jd); //create joint

    jd.bodyA = newBodyA;
    jd.bodyB = joint->GetBodyB();
    jd.localAnchorA = b2Vec2(0, 0);
    jd.localAnchorB = joint->GetLocalAnchorB();
    jd.maxLength = joint->GetMaxLength() * (1 - cutRatio);
    newBodyA->SetTransform(newBodiesPosition, 0.0);
    b2RopeJoint *newJoint2 = (b2RopeJoint *)world->CreateJoint(&jd);
    
    world->DestroyJoint(joint);
    joint = newJoint1;

    VRope* newRope = new VRope(newJoint2,spriteSheet,newRopePoints,newRopeSticks,newRopeSprites);
    return newRope;
}

void VRope::createRope(const CCPoint& pointA, const CCPoint& pointB, float distance)
{
//    float distance = ccpDistance(pointA,pointB);
    int segmentFactor = 12; // 16; //12; //increase value to have less segments per rope, decrease to have more segments
    numPoints = (int) distance/segmentFactor;

    CCPoint diffVector = ccpSub(pointB,pointA);
    float multiplier = distance / (numPoints-1);
    antiSagHack = 0.1f; //HACK: scale down rope points to cheat sag. set to 0 to disable, max suggested value 0.1
    for(int i=0;i<numPoints;i++) {
            CCPoint tmpVector = ccpAdd(pointA, ccpMult(ccpNormalize(diffVector), multiplier*i*(1-antiSagHack)));		
    VPoint *tmpPoint = new VPoint();
    tmpPoint->setPos(tmpVector.x, tmpVector.y);
    vPoints.push_back(tmpPoint);
    }
    for(int i=0;i<numPoints-1;i++) {
    VStick* tmpStick = new VStick(vPoints[i], vPoints[i+1]);
    vSticks.push_back(tmpStick);
    }

    if(spriteSheet) {
	for(int i=0;i<numPoints-1;i++) {
            VPoint* point1 = vSticks[i]->getPointA();
            VPoint* point2 = vSticks[i]->getPointB();
            CCPoint stickVector = ccpSub(ccp(point1->x,point1->y),ccp(point2->x,point2->y));
            float stickAngle = ccpToAngle(stickVector);

            float f = spriteSheet->getTextureAtlas()->getTexture()->getPixelsHigh() / CC_CONTENT_SCALE_FACTOR();
            CCRect r = CCRectMake(0, 0, multiplier, f);
            Sprite* tmpSprite = Sprite::createWithTexture(spriteSheet->getTexture(), r);
            
            Texture2D::TexParams params = {GL_LINEAR, GL_LINEAR, GL_REPEAT, GL_REPEAT};
            tmpSprite->getTexture()->setTexParameters(&params);
            tmpSprite->setPosition(ccpMidpoint(ccp(point1->x, point1->y), ccp(point2->x, point2->y)));
            tmpSprite->setRotation(-1 * CC_RADIANS_TO_DEGREES(stickAngle));
            spriteSheet->addChild(tmpSprite);
            ropeSprites.push_back(tmpSprite);
        }
    }
}