group fix bounding box. Add load image function. Hack for path bounding box to get outlines using setPathWidth(); (#8500)

Author: NickHardeman

addons/ofxSvg/src/ofxSvgElements.cpp

@@ -238,6 +238,14 @@ void ofxSvgImage::load() {
 	}
 }
 
+//--------------------------------------------------------------
+bool ofxSvgImage::load( const of::filesystem::path& afilePath ) {
+	filepath = afilePath;
+	bTryLoad = false;
+	load();
+	return isLoaded();
+}
+
 //--------------------------------------------------------------
 void ofxSvgImage::customDraw() {
 	if( !bTryLoad ) {

addons/ofxSvg/src/ofxSvgElements.h

@@ -213,6 +213,13 @@ class ofxSvgPath : public ofxSvgElement {
 	virtual ofRectangle getBoundingBox() override {
 		if(mBBoxNeedsRecalc) {
 			mBBoxNeedsRecalc = false;
+			
+			// Note: Hack to force outlines by setting a stroke if there is none.
+			float prevStrokeWidth = path.getStrokeWidth();
+			if( prevStrokeWidth < 1.0f ) {
+				path.setStrokeWidth(1.f);
+			}
+			
 //			ofRectangle brect;
 			const auto& outlines = path.getOutline();
 			if( outlines.size() > 0 ) {
@@ -232,6 +239,8 @@ class ofxSvgPath : public ofxSvgElement {
 					}
 				}
 			}
+			
+			path.setStrokeWidth(prevStrokeWidth);
 		}
 		return mBounds;
 	};
@@ -392,6 +401,7 @@ class ofxSvgImage : public ofxSvgElement {
 	};
 
 	void load();
+	bool load( const of::filesystem::path& afilePath );
 	bool isLoaded() {
 		return (img.isAllocated() && img.getWidth() > 0 && img.getHeight() > 0);
 	}

addons/ofxSvg/src/ofxSvgGroup.h

@@ -84,7 +84,9 @@ class ofxSvgGroup : public ofxSvgElement {
 		bool bFirstRect = true;
 		auto allEs = getAllElements(false);
 		for( auto& ele : allEs ) {
-			auto erect = ele->getBoundingBox();
+			// Grab the global bounding box so that we can put it into the group space later
+			// If we just grab the element local bounding box, it doesn't account for position, rotation, etc.
+			auto erect = ele->getGlobalBoundingBox();
 			if( erect.width > 0 && erect.height > 0 ) {
 				if(bFirstRect) {
 					rrect = erect;
@@ -94,6 +96,20 @@ class ofxSvgGroup : public ofxSvgElement {
 				bFirstRect = false;
 			}
 		}
+		
+		if( !bFirstRect ) {
+			// Now lets put the rectangle into the group transform space.
+			auto gmat = getGlobalTransformMatrix();
+			auto gmatInv = glm::inverse(gmat);
+			
+			std::vector<glm::vec3> rverts = { rrect.getTopLeft(), rrect.getTopRight(), rrect.getBottomRight(), rrect.getBottomLeft()};
+			
+			for( auto& rv : rverts ) {
+				rv = glm::vec3(gmatInv * glm::vec4(rv, 1.f));
+			}
+			return _calculateExtents( rverts );
+		}
+		
 		return rrect;
 	};