added samples in readme.md

README.md

@@ -40,7 +40,39 @@ int main()
 }
 ```
 
-### News ###
+### TRYME
+
+Try the above snippet
+[online here](https://godbolt.org/z/d9oqYs34f),
+or on your own Debian-style Linux box:
+```
+$ sudo apt install build-essentials
+$ wget https://raw.githubusercontent.com/skramm/homog2d/master/homog2d.hpp
+$ wget https://raw.githubusercontent.com/skramm/homog2d/master/misc/tryme.cpp
+$ g++ tryme.cpp
+$ ./a.out
+```
+will print:
+```
+[7,8]
+```
+
+#### TRYME2:
+
+A slightly more significant file is [available here](misc/tryme2.cpp), try this:
+
+```
+$ wget https://raw.githubusercontent.com/skramm/homog2d/master/misc/tryme2.cpp
+$ g++ tryme2.cpp
+$ ./a.out
+```
+
+It will generate this Svg file:
+
+![tryme2](docs/tryme2.svg)
+
+
+### News
 
 - 2025-01-26: fresh 2.12 release, see https://github.com/skramm/homog2d/releases
 - 2024-04-21: switch to C++17, enable runtime polymorphism using `std::variant`, [see here](docs/homog2d_manual.md#section_rtp)
@@ -53,7 +85,7 @@ int main()
 
 (see [history](docs/homog2d_history.md) for more)
 
-### Details ##
+### Details
 
 - Install: to install on your machine, copy file `homog2d.hpp` somewhere where your compiler can reach it, or `$ sudo make install` after cloning repo.
 This will copy that file in `/usr/local/include`.

misc/homog2d.cbp

@@ -233,6 +233,8 @@
 		<Unit filename="test_files/single_file.cpp" />
 		<Unit filename="test_files/test_multiple.cpp" />
 		<Unit filename="test_files/ttmath_t1.cpp" />
+		<Unit filename="tryme.cpp" />
+		<Unit filename="tryme2.cpp" />
 		<Extensions>
 			<lib_finder disable_auto="1" />
 		</Extensions>

misc/tryme2.cpp

@@ -0,0 +1,34 @@
+
+#include "homog2d.hpp"
+using namespace h2d;
+using namespace h2d::img;
+
+template<typename T1,typename T2>
+void
+drawPts( Image<SvgImage>& im, const T1& shape1, const T2& shape2 )//, Color col  )
+{
+	auto x = shape1.intersects(shape2);
+	if( x() )
+		draw( im, x.get() ); //, DrawParams().setColor(col) );
+}
+
+int main()
+{
+	Image<SvgImage> im(300,250);
+
+	Line2d li( Point2d(30,50), Point2d(100,80) );
+	li.draw( im, DrawParams().setColor(0,0,250) );
+
+	FRect r( 40,30,200,180 );
+	auto r2 = Homogr(-5.*M_PI/180.) * r;
+	r2.draw( im, DrawParams().setColor(200,0,0) );
+
+	Circle cir( 162, 141, 65 );
+	cir.draw( im, DrawParams().setColor(0,250,0) );
+
+	drawPts( im, li, cir );
+	drawPts( im, li, r2 );
+	drawPts( im, r2, cir );
+
+	std::cout << im;
+}