不多说,上代码
-(NSArray*)getAllPointsFromPoint:(CGPoint)fPoint toPoint:(CGPoint)tPoint
{
NSMutableArray *ret = [NSMutableArray array];
float deltaX = fabsf(tPoint.x - fPoint.x);
float deltaY = fabsf(tPoint.y - fPoint.y);
float x = fPoint.x;
float y = fPoint.y;
float err = deltaX-deltaY;
float sx = -0.5;
float sy = -0.5;
if(fPoint.x<tPoint.x)
sx = 0.5;
if(fPoint.y<tPoint.y)
sy = 0.5;
do
{
[ret addObject:[NSValue valueWithCGPoint:CGPointMake(x, y)]];
float e = 2*err;
if(e > -deltaY)
{
err -=deltaY;
x +=sx;
}
if(e < deltaX)
{
err +=deltaX;
y+=sy;
}
} while (round(x) != round(tPoint.x) && round(y) != round(tPoint.y));
[ret addObject:[NSValue valueWithCGPoint:tPoint]];//add final point
return ret;
}
可以到wiki上看到这个算法说明
英文版:http://en.wikipedia.org/wiki/Bresenham%27s_line_algorithm
中文版:http://zh.wikipedia.org/wiki/布雷森漢姆直線演算法