我在 php 中制作了一条线,到目前为止它显示良好,但我现在遇到的问题是这条线不平滑,它显示为断边。以下是制作半径线的代码:
function draw_radius($img, $x1, $y1, $radius, $angle, $arrow_color, $arrow_length = 10, $arrow_width = 3)
{
$x2 = $x1 + $radius * cos(deg2rad($angle-90));
$y2 = $y1 + $radius * sin(deg2rad($angle-90));
imageline($img, $x1, $y1, $x2, $y2, $arrow_color);
$distance = sqrt(pow($x1 - $x2, 2) + pow($y1 - $y2, 2));
$dx = $x2 + ($x1 - $x2) * $arrow_length / $distance;
$dy = $y2 + ($y1 - $y2) * $arrow_length / $distance;
$k = $arrow_width / $arrow_length;
$x2o = $x2 - $dx;
$y2o = $dy - $y2;
$x3 = $y2o * $k + $dx;
$y3 = $x2o * $k + $dy;
$x4 = $dx - $y2o * $k;
$y4 = $dy - $x2o * $k;
imageline($img, $x1, $y1, $dx, $dy, $arrow_color);
imageline($img, $x3, $y3, $x4, $y4, $arrow_color);
imageline($img, $x3, $y3, $x2, $y2, $arrow_color);
imageline($img, $x2, $y2, $x4, $y4, $arrow_color);
}
以下是指南针示例,我在上面画线。
compass example http://img246.imageshack.us/img246/6329/compassx.png
最佳答案
我自己还没有在 GD 中尝试抗锯齿,但它似乎在那里......
关于php图像箭头线需要平滑,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2307264/