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JFOpenGLCamera.m
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JFOpenGLCamera.m
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//
// JFOpenGLCamera.m
// JFCommon
//
// Created by Jason Fuerstenberg on 2006/06/12.
// Copyright (c) 2006 Jason Fuerstenberg. All rights reserved.
//
// http://www.jayfuerstenberg.com
// jay@jayfuerstenberg.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#import "JFOpenGLCamera.h"
@implementation JFOpenGLCamera
#pragma mark - Properties
@synthesize referencePoint = _referencePoint;
@synthesize transformReferencePoint = _transformReferencePoint;
@synthesize transformMatrix = _transformMatrix;
@synthesize shouldUpdateTransformMatrix = _shouldUpdateTransformMatrix;
@synthesize zoomFactor = _zoomFactor;
@synthesize width = _width;
@synthesize height = _height;
#pragma mark - Object lifecycle methods
- (id) initWithWidth: (GLfloat) width height: (GLfloat) height {
self = [super init];
if (self != nil) {
[self setReferencePoint: [JFOpenGLVertex vertex]];
[self setTransformReferencePoint: _referencePoint];
[self setTransformMatrix: [JFOpenGLMatrix matrix]];
// The transform matrix has yet to be setup so set it to be updated.
[self setShouldUpdateTransformMatrix: YES];
[self setWidth: width
height: height];
_zoomFactor = 1.0f;
}
[self updateOnScreenCoordinates];
return self;
}
- (void) dealloc {
#if __has_feature(objc_arc)
_referencePoint = nil;
_transformReferencePoint = nil;
_transformMatrix = nil;
#else
[_referencePoint release];
[_transformReferencePoint release];
[_transformMatrix release];
[super dealloc];
#endif
}
#pragma mark - Action methods
- (void) setWidth: (GLfloat) width height: (GLfloat) height {
_width = width;
_height = height;
_halfWidth = width * 0.5f;
_halfHeight = height * 0.5f;
}
- (void) updateOnScreenCoordinates {
_leftOnScreenX = _referencePoint->_x - _halfWidth;
_rightOnScreenX = _referencePoint->_x + _halfWidth;
_bottomOnScreenY = _referencePoint->_y - _halfHeight;
_topOnScreenY = _referencePoint->_y + _halfHeight;
}
- (void) transformVertex: (JFOpenGLVertex *) vertex {
if (vertex == nil) {
return;
}
vertex->_x -= _referencePoint->_x;
vertex->_y -= _referencePoint->_y;
vertex->_z -= _referencePoint->_z;
}
- (void) panLeft: (GLfloat) left {
_referencePoint->_x -= left;
}
- (void) panRight: (GLfloat) right {
_referencePoint->_x += right;
}
// Maybe make more utility methods here
@end