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/* MiscDiamondShape.m
Copyright 1996 Uwe Hoffmann.
This notice may not be removed from this source code.
The use and distribution of this software is governed by the
terms of the MiscKit license agreement. Refer to the license
document included with the MiscKit distribution for the terms.
Version 2 (August 1996)
*/
#import <Foundation/Foundation.h>
#import "MiscDiamondShape.h"
#import "MiscUserPath.h"
#import "MiscHitPath.h"
@implementation MiscDiamondShape
- (NSRect)innerBounds
{
NSRect br,ir;
NSPoint m;
float a,b,cx,cy;
br = [path bounds];
m.x = br.origin.x + br.size.width / 2;
m.y = br.origin.y + br.size.height / 2;
a = br.size.width / 2;
b = br.size.height / 2;
cx = a / 2;
cy = b / 2;
ir.origin.x = m.x - cx;
ir.origin.y = m.y - cy;
ir.size.width = 2 * cx;
ir.size.height = 2 * cy;
return ir;
}
- (MiscShapeType)shapeType
{
return MiscDiamondShapeType;
}
- (void)calcIntersection:(NSPoint *)ip angle:(float *)alpha toPoint:(NSPoint)aPoint
{
NSPoint middle,l1,l2,pos;
float s,ausdruck,width,height,*bbox;
bbox = [path bbox];
pos.x = bbox[0];
pos.y = bbox[1];
width = bbox[2] - bbox[0];
height = bbox[3] - bbox[1]; middle.x = pos.x + width / 2;
middle.y = pos.y + height / 2;
if(aPoint.y == middle.y){
ip->y = middle.y;
if(aPoint.x > middle.x){
*alpha = 0;
ip->x = pos.x + width;
} else {
*alpha = 180;
ip->x = pos.x;
}
return;
}
if(aPoint.x == middle.x){
ip->x = middle.x;
if(aPoint.y > middle.y){
ip->y = pos.y + height;
*alpha = 90;
} else {
ip->y = pos.y;
*alpha = -90;
}
return;
}
s = (aPoint.y - middle.y) / (aPoint.x - middle.x);
*alpha = 57.29577951 * atan(s);
if(aPoint.y > middle.y){
if(aPoint.x > middle.x){ // I. quadrant
l1.x = middle.x;
l1.y = pos.y + height;
l2.x = pos.x + width;
l2.y = middle.y;
ausdruck = (l2.y - l1.y) / (l2.x - l1.x);
ip->x = (middle.y + ausdruck * l1.x - s * middle.x - l1.y) / (ausdruck - s);
ip->y = middle.y + s * (ip->x - middle.x);
} else { // II. quadrant
l1.x = middle.x;
l1.y = pos.y + height;
l2.x = pos.x;
l2.y = middle.y;
ausdruck = (l2.y - l1.y) / (l2.x - l1.x);
ip->x = (middle.y + ausdruck * l1.x - s * middle.x - l1.y) / (ausdruck - s);
ip->y = middle.y + s * (ip->x - middle.x);
*alpha += 180;
}
} else {
if(aPoint.x > middle.x){ // IV. quadrant
l1.x = middle.x;
l1.y = pos.y;
l2.x = pos.x + width;
l2.y = middle.y;
ausdruck = (l2.y - l1.y) / (l2.x - l1.x);
ip->x = (middle.y + ausdruck * l1.x - s * middle.x - l1.y) / (ausdruck - s);
ip->y = middle.y + s * (ip->x - middle.x);
} else { // III. quadrant
l1.x = middle.x;
l1.y = pos.y;
l2.x = pos.x;
l2.y = middle.y;
ausdruck = (l2.y - l1.y) / (l2.x - l1.x);
ip->x = (middle.y + ausdruck * l1.x - s * middle.x - l1.y) / (ausdruck - s);
ip->y = middle.y + s * (ip->x - middle.x);
*alpha += 180;
}
}
}
- (void)makePathWithBounds:(NSRect)aRect
{
[path moveto:aRect.origin.x + aRect.size.width / 2 :aRect.origin.y];
[path rlineto:aRect.size.width / 2 :aRect.size.height / 2];
[path rlineto:-aRect.size.width / 2 :aRect.size.height / 2];
[path rlineto:-aRect.size.width / 2 :-aRect.size.height / 2];
[path closepath];
}
- (void)fillParamsWithBounds:(NSRect)aRect
{
float *params, *bbox;
params = [path params];
bbox = [path bbox];
bbox[0] = aRect.origin.x;
bbox[1] = aRect.origin.y;
bbox[2] = aRect.origin.x + aRect.size.width;
bbox[3] = aRect.origin.y + aRect.size.height;
params[0] = aRect.origin.x + aRect.size.width / 2;
params[1] = aRect.origin.y;
params[2] = aRect.size.width / 2;
params[3] = aRect.size.height / 2;
params[4] = -aRect.size.width / 2;
params[5] = aRect.size.height / 2;
params[6] = -aRect.size.width / 2;
params[7] = -aRect.size.height / 2;
}
+ (NSSize)calcSizeForInnerSize:(NSSize)aSize
{
NSSize os;
float a,b,cx,cy;
cx = aSize.width / 2;
cy = aSize.height / 2;
a = cx * 2;
b = cy * 2;
os.width = 2 * a;
os.height = 2 * b;
return os;
}
@end
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