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fix bugs that button renderer generated bad values if it zero-size

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This commit is contained in:
Jinhao
2017-07-01 07:32:45 +08:00
parent fa80519526
commit afd8225875
4 changed files with 29 additions and 19 deletions
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16
source/paint/graphics.cpp
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@@ -1196,7 +1196,11 @@ namespace paint
#elif defined(NANA_X11)
if (nullptr == impl_->handle) return;
double deltapx = double(vertical ? rct.height : rct.width);
nana::rectangle good_rct;
if(!nana::overlap(nana::rectangle{ size() }, rct, good_rct))
return;
double deltapx = double(vertical ? good_rct.height : good_rct.width);
double r, g, b;
const double delta_r = (to.r() - (r = from.r())) / deltapx;
const double delta_g = (to.g() - (g = from.g())) / deltapx;
@@ -1207,13 +1211,13 @@ namespace paint
Display * disp = nana::detail::platform_spec::instance().open_display();
impl_->handle->set_color(static_cast<color_rgb>(last_color));
impl_->handle->update_color();
const int endpos = deltapx + (vertical ? rct.y : rct.x);
const int endpos = deltapx + (vertical ? good_rct.y : good_rct.x);
if (endpos > 0)
{
if (vertical)
{
int x1 = rct.x, x2 = rct.right();
auto y = rct.y;
int x1 = good_rct.x, x2 = good_rct.right();
auto y = good_rct.y;
for (; y < endpos; ++y)
{
::XDrawLine(disp, impl_->handle->pixmap, impl_->handle->context, x1, y, x2, y);
@@ -1228,8 +1232,8 @@ namespace paint
}
else
{
int y1 = rct.y, y2 = rct.bottom();
auto x = rct.x;
int y1 = good_rct.y, y2 = good_rct.bottom();
auto x = good_rct.x;
for (; x < endpos; ++x)
{
::XDrawLine(disp, impl_->handle->pixmap, impl_->handle->context, x, y1, x, y2);