Add drawSquareOutline

src/jngl/shapes.hpp

@@ -141,7 +141,7 @@ void drawRect(const Mat3& modelview, Vec2 size, Rgb);
 /// Use setAlpha to set the opacity.
 void drawRect(Mat3 modelview, Vec2 size, Rgba color);
 
-/// Draws a square of size 1x1 centered at (0, 0) with the specified color
+/// Draws a (filled) square of size 1x1 centered at (0, 0) with the specified color
 ///
 /// By squaling the modelview matrix you can change the size of the square, effectively turning it
 /// into a rectangle:
@@ -151,6 +151,17 @@ void drawRect(Mat3 modelview, Vec2 size, Rgba color);
 /// \endcode
 void drawSquare(const Mat3& modelview, Rgba color);
 
+/// Draws the outline of a square (so □ instead of ■) of size 1x1 centered at (0, 0) with the
+/// specified color
+///
+/// By squaling the modelview matrix you can change the size of the square, effectively turning it
+/// into a rectangle:
+/// \code
+/// // draws a rectangle at (12 - 56 / 2, 34 - 78 / 2) with a size of 56x78 in red:
+/// drawSquareOutline(jngl::modelview().translate(12, 34).scale(56, 78), 0xff0000ff_rgba, 2.f);
+/// \endcode
+void drawSquareOutline(Mat3 modelview, float lineWidth, Rgba color);
+
 template <class Vect> void drawRect(Vect pos, Vect size) {
 	drawRect(pos.x, pos.y, size.x, size.y);
 }

src/main.cpp

@@ -502,6 +502,14 @@ void drawSquare(const Mat3& modelview, Rgba color) {
 	pWindow->drawSquare(modelview, color);
 }
 
+void drawSquareOutline(Mat3 modelview, float lineWidth, Rgba color) {
+	glLineWidth(lineWidth);
+	pWindow->drawLine(modelview.translate({ -.5, -.5 }), { 1, 0 }, color);
+	pWindow->drawLine(modelview, { 0, 1 }, color);
+	pWindow->drawLine(modelview.translate({ 1, 1 }), { 0, -1 }, color);
+	pWindow->drawLine(modelview, { -1, 0 }, color);
+}
+
 void drawTriangle(const Vec2 a, const Vec2 b, const Vec2 c) {
 	ShaderCache::handle().drawTriangle(a, b, c);
 }