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as3 从位图中复制自定义形状

发布于 2024-08-13 00:53:51 字数 137 浏览 4 评论 0原文

所以，我有 bitmapA ，它是矩形的。我有一个想要复制的裁剪区域...

但是，位图与裁剪区域成一定角度。

如何从位图中复制不是位于 x、y、轴上的矩形的部分？

或者复制自定义形状？？？

谢谢

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疑心病 2024-08-20 00:53:51

如果需要旋转裁剪矩形，可以使用 draw 方法按照 shortstick 建议裁剪红色区域，如下所示：

替代文本 http://axly.org/_tmp/stackoverflow/crop_sample.png

var crop_rect:Rectangle = new Rectangle(0,0,64,57);//size of the segment to copy
var crop_point:Point = new Point(40,50);//relative position of the crop from the top/left corner of the image
var crop_angle:Number = Math.PI / 12;//angle of the crop relative to image in radians (clockwise)

//transformation [tx,ty] parameters representing shift after rotation
var dA:Number = Math.atan(crop_point.y / crop_point.x) - crop_angle;
var tX:Number = crop_point.length * Math.cos(dA);
var tY:Number = crop_point.length * Math.sin(dA);

var scaleMatrix:Matrix = new Matrix(Math.cos( -  crop_angle),Math.sin( -  crop_angle), -  Math.sin( -  crop_angle),Math.cos( -  crop_angle), -  tX, -  tY);
var colorTransform:ColorTransform = new ColorTransform();//no colour transformation needed

//copy selected segment after rotation and shift to match the size of the crop
var result_bitmap = new BitmapData(crop_rect.width,crop_rect.height);
result_bitmap.draw(source_img, scaleMatrix , colorTransform, null, crop_rect, true);
var result_img:Bitmap = new Bitmap(result_bitmap);

结果如下：
替代文本 http://axly.org/_tmp/stackoverflow/crop_result.png
希望这就是您正在寻找的内容，否则请提供更多详细信息，甚至更好地提供视觉样本。

If you need to crop a rectangle with rotation, you can use draw method as suggested by shortstick to crop the red area as shown below:

alt text http://axly.org/_tmp/stackoverflow/crop_sample.png

var crop_rect:Rectangle = new Rectangle(0,0,64,57);//size of the segment to copy
var crop_point:Point = new Point(40,50);//relative position of the crop from the top/left corner of the image
var crop_angle:Number = Math.PI / 12;//angle of the crop relative to image in radians (clockwise)

//transformation [tx,ty] parameters representing shift after rotation
var dA:Number = Math.atan(crop_point.y / crop_point.x) - crop_angle;
var tX:Number = crop_point.length * Math.cos(dA);
var tY:Number = crop_point.length * Math.sin(dA);

var scaleMatrix:Matrix = new Matrix(Math.cos( -  crop_angle),Math.sin( -  crop_angle), -  Math.sin( -  crop_angle),Math.cos( -  crop_angle), -  tX, -  tY);
var colorTransform:ColorTransform = new ColorTransform();//no colour transformation needed

//copy selected segment after rotation and shift to match the size of the crop
var result_bitmap = new BitmapData(crop_rect.width,crop_rect.height);
result_bitmap.draw(source_img, scaleMatrix , colorTransform, null, crop_rect, true);
var result_img:Bitmap = new Bitmap(result_bitmap);

The result is below:
alt text http://axly.org/_tmp/stackoverflow/crop_result.png
Hope that is what you were looking for, otherwise please give more details and, even better, a visual sample.

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