Initial commit, read more

This commit includes:

* Button
* TextLine
* TextBox
* TextField

It also includes these dependencies:

* Image
* BoundingBox

text_line.cpp

@@ -0,0 +1,78 @@
+/* Copyright: (c) Kayne Ruse 2013-2016
+ * 
+ * This software is provided 'as-is', without any express or implied
+ * warranty. In no event will the authors be held liable for any damages
+ * arising from the use of this software.
+ * 
+ * Permission is granted to anyone to use this software for any purpose,
+ * including commercial applications, and to alter it and redistribute it
+ * freely, subject to the following restrictions:
+ * 
+ * 1. The origin of this software must not be misrepresented; you must not
+ * claim that you wrote the original software. If you use this software
+ * in a product, an acknowledgment in the product documentation would be
+ * appreciated but is not required.
+ * 
+ * 2. Altered source versions must be plainly marked as such, and must not be
+ * misrepresented as being the original software.
+ * 
+ * 3. This notice may not be removed or altered from any source
+ * distribution.
+*/
+#include "text_line.hpp"
+
+#include "render_text_texture.hpp"
+
+#include <stdexcept>
+
+TextLine::TextLine() {
+	//
+}
+
+TextLine::TextLine(SDL_Renderer* renderer, TTF_Font* font, SDL_Color color, std::string str, int x, int y) {
+	SetText(renderer, font, color, str);
+	posX = x;
+	posY = y;
+}
+
+TextLine::~TextLine() {
+	ClearText();
+}
+
+void TextLine::DrawTo(SDL_Renderer* renderer) {
+	SDL_Rect dclip = {posX, posY, 0, 0};
+	SDL_QueryTexture(texture, nullptr, nullptr, &dclip.w, &dclip.h);
+	SDL_RenderCopy(renderer, texture, nullptr, &dclip);
+}
+
+void TextLine::SetText(SDL_Renderer* renderer, TTF_Font* font, SDL_Color color, std::string str) {
+	//just use the above global function
+	SDL_DestroyTexture(texture);
+	texture = renderTextTexture(renderer, font, color, str);
+	pointHeight = TTF_FontHeight(font);
+}
+
+void TextLine::ClearText() {
+	SDL_DestroyTexture(texture);
+	pointHeight = 0;
+}
+
+int TextLine::SetX(int i) {
+	return posX = i;
+}
+
+int TextLine::SetY(int i) {
+	return posY = i;
+}
+
+int TextLine::GetX() const {
+	return posX;
+}
+
+int TextLine::GetY() const {
+	return posY;
+}
+
+int TextLine::GetPointHeight() {
+	return pointHeight;
+}