the basic finished version

Makefile

@@ -1,8 +1,8 @@
 
 CPP=g++
 
-CXXFLAGS=`Magick++-config --cppflags`
-LDFLAGS=`Magick++-config --ldflags`
+CXXFLAGS=`Magick++-config --cflags --cppflags`
+LDFLAGS=`Magick++-config --ldflags --libs`
 
 .PHONY: all
 .PHONY: clean

src/main/cpp/captcha.hpp

@@ -1,6 +1,7 @@
 #include <Magick++.h>
 #include <string>
 #include <stdio.h>
+#include <sstream>
 
 struct rgb {
 	rgb(uint16_t red, uint16_t green, uint16_t blue) :
@@ -19,13 +20,15 @@ using Magick::Drawable;
 using Magick::DrawableText;
 using Magick::DrawableGravity;
 using Magick::CenterGravity;
+using Magick::NorthWestGravity;
 using Magick::DrawableFont;
 using Magick::DrawablePointSize;
 using Magick::DrawableRotation;
 using Magick::DrawableStrokeColor;
 using Magick::DrawableFillColor;
 using Magick::NormalStyle;
 using Magick::NormalStretch;
+using Magick::PolynomialDistortion;
 
 class background {
 public:
@@ -85,10 +88,56 @@ class text {
 	Image* _img;
 };
 
+class mathadd {
+public:
+	mathadd(int a, int b, int x, int y, rgb rgb) :
+		_a(a), _b(b), _x(x), _y(y), _rgb(rgb) {
+	}
+	template<typename T> mathadd* merge(T old) {
+		this->_img = old->img();
+		std::list<Drawable> txt;
+		txt.push_back(DrawableGravity(NorthWestGravity));
+		txt.push_back(DrawablePointSize(25));
+		txt.push_back(DrawableStrokeColor(Color(_rgb.r, _rgb.g, _rgb.b)));
+		txt.push_back(DrawableFillColor(Color(_rgb.r, _rgb.g, _rgb.b, 0)));
+		std::ostringstream text;
+		text << "Please solve: " << std::endl << _a << "+" << _b << "=?";
+		txt.push_back(DrawableText(_x, _y, text.str()));
+		_img->draw(txt);
+		return this;
+	}
+
+	Image* img() {
+			return _img;
+	}
+private:
+	int _a;
+	int _b;
+	int _x;
+	int _y;
+	rgb _rgb;
+	Image* _img;
+};
 class distorting {
 public:
 	template<typename T> distorting* merge(T old) {
 		this->_img = old->img();
+		double arr[] = {2,
+				0.5, 0.5,        8.5,    7.5,
+				16.5,   0.5,        20.5,   5.5,
+				32.5,   0.5,        33.5,   3.5,
+				48.5,   0.5,        48.5,   1.5,
+				64.5,   0.5,        64.5,   1.5,
+				80.5,   0.5,        80.5,   1.5,
+				96.5,   0.5,        95.5,   3.5,
+				112.5,  0.5,        109.5,  5.5,
+				128.5,  0.5,        121.5,  7.5,
+			0, 0,	0, 0,
+			300, 200,	300, 200,
+			300, 0, 	300, 0,
+			0, 200, 	0, 200,
+		};
+		_img->distort(PolynomialDistortion, sizeof(arr)/sizeof(double), arr, false);
 		return this;
 	}
 

src/main/cpp/main.cpp

@@ -7,9 +7,10 @@ int main() {
 
   background bg(300, 200, rgb(0x0000, 0xF000, 0x0000));
   text text("Hello", "./au.ttf", 50, 1, 0, 0, rgb(0x0000, 0x0000, 0xF000));
+  mathadd mathadd(3, 5, 0, 0, rgb(0x0000, 0x0000, 0xF000));
   distorting distorting;
   save save("background.png");
-  save.merge(distorting.merge(text.merge(bg.merge(NULL))));
+  save.merge(distorting.merge(mathadd.merge(bg.merge(NULL))));
 
   return 0;
 }