AGG第十五課 agg::rounded_rect 渲染圓角矩形

頭檔案：#include <agg_rounded_rect.h>

類構造器：rounded_rect(double x1, double y1, doublex2, double y2, double r)

    矩形對角點的坐标（左上角和右下角的坐标）和圓角半徑

圓角半徑如果指定是0，繪制的是一個正規的矩形！！

agg/examples/rounded_rect.cpp是一個圓角矩形的例子。其中不了解的地方就是subpixel offset，亞像素偏移

I'm tring to get bounding rectangle of object and trind below code

// Round Rect

agg::rounded_rect r(0,0,width,height,0);

r.normalize_radius();

ras.add_path(r);

agg::render_scanlines_aa(ras, sl, renb,grad_alloc, grad_gen);

but I cann't call   r.bound_rect()

for what kinds of objects bound_rectfunction can be called ??

     本文轉自fengyuzaitu 51CTO部落格，原文連結：http://blog.51cto.com/fengyuzaitu/1961384，如需轉載請自行聯系原作者