23 December 2010

Resumed work on getting the pan gesture for translation up. Tried out another method of translation after studying a similar application. This method does not apply the calculation of the frustum's length at a particular z-axis, which at first made me wonder why it worked so well on that application.

---

- (void)panGestureCaptured:(UIGestureRecognizer *)gesture

{

...

...

...

static CGPoint currentLocation;

static CGPoint previousLocation;

ModelTransformation *obj = [[ModelTransformation alloc] init];

int objIndex = [eaglView retrieveObjectWithUniqueColors:gesture];

Vertex3D tempCurrentPosition = [eaglView getNodePositionWithIndex:objIndex];

if(gesture.state == UIGestureRecognizerStateBegan)

{

currentLocation = [gesture locationInView:[gesture view]];

currentLocation = [self convertToGL:currentLocation];

}

else if (gesture.state == UIGestureRecognizerStateChanged)

{

previousLocation = CGPointMake(currentLocation.x, currentLocation.y);

currentLocation = [gesture locationInView:[gesture view]];

currentLocation = [self convertToGL:currentLocation];

CGPoint diff = CGPointMake(currentLocation.x - previousLocation.x, currentLocation.y - previousLocation.y);

obj.xTranslation = tempCurrentPosition.x + diff.x;

obj.yTranslation = tempCurrentPosition.y + diff.y;

obj.ifTranslate = YES;

obj.node = objIndex;

[eaglView setTransformation:obj];

[obj release];

}

}

- (CGPoint)convertToGL:(CGPoint)uiPoint

{

float newY = eaglView.frame.size.height - uiPoint.y;

float newX = eaglView.frame.size.width - uiPoint.x;

CGPoint ret;

switch ([UIDevice currentDevice].orientation) {

case UIDeviceOrientationPortrait:

ret = CGPointMake(uiPoint.x, newY);

break;

case UIDeviceOrientationPortraitUpsideDown:

ret = CGPointMake(newX, uiPoint.y);

break;

case UIDeviceOrientationLandscapeLeft:

ret.x = uiPoint.y;

ret.y = uiPoint.x;

break;

case UIDeviceOrientationLandscapeRight:

ret.x = newY;

ret.y = newX;

break;

}

return ret;

}

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This seems to work really nicely with some of the models that we have. Some of them just do not seem to work well at all.