SVG transforms now less broken
authorSam Moore <matches@ucc.asn.au>
Tue, 12 Aug 2014 16:54:35 +0000 (00:54 +0800)
committerSam Moore <matches@ucc.asn.au>
Tue, 12 Aug 2014 16:54:35 +0000 (00:54 +0800)
They work for rabbit_simple.svg now; that's pretty cool
Still appear slightly broken for more complicated SVGs (eg: the fox in ipdf/sam).

svg-tests/recursive.svg produces this error in eye of mate:
(eom:7883): librsvg-WARNING **: Circular SVG reference noticed, dropping

(If you have only one group referencing itself, there is no error but no recursion).

src/document.cpp
src/document.h
src/svg-tests/recursive.svg [new file with mode: 0644]
src/svg-tests/transforms.svg

index 3105629..9d9011e 100644 (file)
@@ -290,7 +290,8 @@ static string & GetToken(const string & d, string & token, unsigned & i, const s
 static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const string & delims = "()[],{}<>;:=")
 {
        string token("");
-       x = strtod(GetToken(d, token, i, delims).c_str(),NULL);
+       while (GetToken(d, token, i, delims) == ",");
+       x = strtod(token.c_str(),NULL);
        if (GetToken(d, token, i, delims) != ",")
        {
                Fatal("Expected \",\" seperating x,y pair");
@@ -298,7 +299,7 @@ static void GetXYPair(const string & d, Real & x, Real & y, unsigned & i,const s
        y = strtod(GetToken(d, token, i, delims).c_str(),NULL);
 }
 
-static void TransformXYPair(Real & x, Real & y, SVGMatrix & transform)
+static void TransformXYPair(Real & x, Real & y, const SVGMatrix & transform)
 {
        Real x0(x);
        x = transform.a * x + transform.c * y + transform.e;
@@ -311,57 +312,70 @@ void Document::ParseSVGTransform(const string & s, SVGMatrix & transform)
        string token;
        string command;
        unsigned i = 0;
-       GetToken(s, command, i);
-       Debug("Token is \"%s\"", command.c_str());
        
-       SVGMatrix delta = {1,0,0,1,0,0};
+       while (i < s.size())
+       {
+               GetToken(s, command, i);
+               if (command == "," || command == "" || command == ":")
+               {
+                       if (i < s.size())
+                               GetToken(s, command, i);
+                       else
+                               return;
+               }
+               Debug("Token is \"%s\"", command.c_str());
        
+               SVGMatrix delta = {1,0,0,0,1,0};
        
-       assert(GetToken(s,token, i) == "(");
-       if (command == "translate")
-       {
-               GetXYPair(s, delta.e, delta.f, i);
-               assert(GetToken(s,token, i) == ")");    
-       }
-       else if (command == "matrix")
-       {
-               GetXYPair(s, delta.a, delta.b,i);
-               GetXYPair(s, delta.c, delta.d,i);
-               GetXYPair(s, delta.e, delta.f,i);
-               assert(GetToken(s,token, i) == ")");    
-       }
-       else if (command == "scale")
-       {
-               delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
-               GetToken(s, token, i);
-               if (token != ")")
+       
+               assert(GetToken(s,token, i) == "(");
+               if (command == "translate")
+               {
+                       GetXYPair(s, delta.e, delta.f, i);
+                       assert(GetToken(s,token, i) == ")");    
+               }
+               else if (command == "matrix")
                {
-                       delta.b = (strtod(token.c_str(), NULL));
+                       GetXYPair(s, delta.a, delta.b,i);
+                       GetXYPair(s, delta.c, delta.d,i);
+                       GetXYPair(s, delta.e, delta.f,i);
+                       assert(GetToken(s,token, i) == ")");    
+               }
+               else if (command == "scale")
+               {
+                       delta.a = (strtod(GetToken(s,token,i).c_str(), NULL));
+                       GetToken(s, token, i);
+                       if (token == ",")
+                       {
+                               delta.d = (strtod(GetToken(s,token,i).c_str(), NULL));
+                               assert(GetToken(s, token, i) == ")");
+                       }
+                       else
+                       {
+                               delta.d = delta.a;
+                               assert(token == ")");
+                       }
+                       
                }
                else
                {
-                       delta.b = delta.a;
+                       Warn("Unrecognised transform \"%s\", using identity", command.c_str());
                }
-               
-       }
-       else
-       {
-               Warn("Unrecognised transform \"%s\", using identity", command.c_str());
-       }
        
-       Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
-       Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
+               Debug("Old transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
+               Debug("Delta transform is {%f,%f,%f,%f,%f,%f}", delta.a, delta.b, delta.c, delta.d,delta.e,delta.f);
        
-       SVGMatrix old(transform);
-       transform.a = old.a * delta.a + old.c * delta.b;
-       transform.c = old.a * delta.c + old.c * delta.d;
-       transform.e = old.a * delta.e + old.c * delta.f + old.e;
+               SVGMatrix old(transform);
+               transform.a = old.a * delta.a + old.c * delta.b;
+               transform.c = old.a * delta.c + old.c * delta.d;
+               transform.e = old.a * delta.e + old.c * delta.f + old.e;
        
-       transform.b = old.b * delta.a + old.d * delta.b;
-       transform.d = old.b * delta.c + old.d * delta.d;
-       transform.f = old.b * delta.e + old.d * delta.f + old.f;
+               transform.b = old.b * delta.a + old.d * delta.b;
+               transform.d = old.b * delta.c + old.d * delta.d;
+               transform.f = old.b * delta.e + old.d * delta.f + old.f;
        
-       Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
+               Debug("New transform is {%f,%f,%f,%f,%f,%f}", transform.a, transform.b, transform.c, transform.d,transform.e,transform.f);
+       }
 }
 
 void Document::ParseSVGNode(pugi::xml_node & root, SVGMatrix & parent_transform)
@@ -464,8 +478,8 @@ void Document::LoadSVG(const string & filename, const Rect & bounds)
        Debug("Loaded XML - %s", result.description());
        
        input.close();
-
-       SVGMatrix transform = {bounds.w, 0,bounds.x, bounds.h,0,bounds.y};
+                                               // a c e, b d f
+       SVGMatrix transform = {bounds.w, 0,bounds.x, 0,bounds.h,bounds.y};
        ParseSVGNode(doc_xml, transform);
 }
 
@@ -507,14 +521,12 @@ void Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
                if (command == "m" || command == "M")
                {
                        //Debug("Construct moveto command");
-                       Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) * transform.a;
+                       Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        assert(GetToken(d,token,i,delims) == ",");
-                       Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) * transform.d;
+                       Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        
-                       x[0] = (relative) ? x[0] + dx : dx + transform.e;
-                       y[0] = (relative) ? y[0] + dy : dy + transform.f;
-                       
-
+                       x[0] = (relative) ? x[0] + dx : dx;
+                       y[0] = (relative) ? y[0] + dy : dy;
                        
                        //Debug("mmoveto %f,%f", Float(x[0]),Float(y[0]));
                        command = (command == "m") ? "l" : "L";
@@ -522,27 +534,27 @@ void Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
                else if (command == "c" || command == "C" || command == "q" || command == "Q")
                {
                        //Debug("Construct curveto command");
-                       Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) * transform.a;
+                       Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        assert(GetToken(d,token,i,delims) == ",");
-                       Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL))*transform.d;
+                       Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        
-                       x[1] = (relative) ? x[0] + dx : dx + transform.e;
-                       y[1] = (relative) ? y[0] + dy : dy + transform.f;
+                       x[1] = (relative) ? x[0] + dx : dx;
+                       y[1] = (relative) ? y[0] + dy : dy;
                        
-                       dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.a;
+                       dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        assert(GetToken(d,token,i,delims) == ",");
-                       dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.d;
+                       dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        
-                       x[2] = (relative) ? x[0] + dx : dx + transform.e;
-                       y[2] = (relative) ? y[0] + dy : dy + transform.f;
+                       x[2] = (relative) ? x[0] + dx : dx;
+                       y[2] = (relative) ? y[0] + dy : dy;
                        
                        if (command != "q" && command != "Q")
                        {
-                               dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.a;
+                               dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                                assert(GetToken(d,token,i,delims) == ",");
-                               dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.d;
-                               x[3] = (relative) ? x[0] + dx : dx + transform.e;
-                               y[3] = (relative) ? y[0] + dy : dy + transform.f;
+                               dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
+                               x[3] = (relative) ? x[0] + dx : dx;
+                               y[3] = (relative) ? y[0] + dy : dy;
                        }
                        else
                        {
@@ -555,41 +567,47 @@ void Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
                                y[2] = y[3] + Real(2) * (old_y1 - y[3])/ Real(3);
                        }
                        
+                       Real x3(x[3]);
+                       Real y3(y[3]);
+                       for (int j = 0; j < 4; ++j)
+                               TransformXYPair(x[j],y[j], transform);
+
                        unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
                        Add(BEZIER,Rect(0,0,1,1),index);
                        
                        
                        //Debug("[%u] curveto %f,%f %f,%f %f,%f", index, Float(x[1]),Float(y[1]),Float(x[2]),Float(y[2]),Float(x[3]),Float(y[3]));
                        
-                       x[0] = x[3];
-                       y[0] = y[3];
+                       x[0] = x3;
+                       y[0] = y3;
 
                        
                }
                else if (command == "l" || command == "L")
                {
-                       //Debug("Construct lineto command");
+                       Debug("Construct lineto command, relative %d", relative);
                
-                       Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.a;
+                       Real dx = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        assert(GetToken(d,token,i,delims) == ",");
-                       Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL)) *transform.d;
+                       Real dy = Real(strtod(GetToken(d,token,i,delims).c_str(),NULL));
                        
-                       x[1] = (relative) ? x[0] + dx : dx + transform.e;
-                       y[1] = (relative) ? y[0] + dy : dy + transform.f;
+                       x[1] = (relative) ? x[0] + dx : dx;
+                       y[1] = (relative) ? y[0] + dy : dy;
                        
-                       x[2] = x[1];
-                       y[2] = y[1];
+                       Real x1(x[1]);
+                       Real y1(y[1]);
                        
-                       x[3] = x[1];
-                       y[3] = y[1];
+                       TransformXYPair(x[0],y[0],transform);
+                       TransformXYPair(x[1],y[1],transform);
 
-                       unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
+
+                       unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[1],y[1],x[1],y[1]));
                        Add(BEZIER,Rect(0,0,1,1),index);
                        
                        //Debug("[%u] lineto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
                        
-                       x[0] = x[3];
-                       y[0] = y[3];
+                       x[0] = x1;
+                       y[0] = y1;
 
                }
                else if (command == "z" || command == "Z")
@@ -602,13 +620,18 @@ void Document::ParseSVGPathData(const string & d, const SVGMatrix & transform)
                        x[3] = x0;
                        y[3] = y0;
                        
+                       Real x3(x[3]);
+                       Real y3(y[3]);
+                       for (int j = 0; j < 4; ++j)
+                               TransformXYPair(x[j],y[j], transform);
+
                        unsigned index = AddBezierData(Bezier(x[0],y[0],x[1],y[1],x[2],y[2],x[3],y[3]));
                        Add(BEZIER,Rect(0,0,1,1),index);
                        
                        //Debug("[%u] returnto %f,%f %f,%f", index, Float(x[0]),Float(y[0]),Float(x[1]),Float(y[1]));
                        
-                       x[0] = x[3];
-                       y[0] = y[3];
+                       x[0] = x3;
+                       y[0] = y3;
                        command = "m";
                }
                else
index 52e9295..529e4ab 100644 (file)
@@ -14,10 +14,11 @@ namespace IPDF
        struct SVGMatrix
        {
                Real a; // width
-               Real b; // skew y by x
                Real c; // skew x by y
-               Real d; // height
                Real e; // translate x
+               
+               Real b; // skew y by x
+               Real d; // height
                Real f; // translate y
        };
        // SVG matrix transforms (x,y) <- (a x' + c y' + e, b x' + d y' + f)
diff --git a/src/svg-tests/recursive.svg b/src/svg-tests/recursive.svg
new file mode 100644 (file)
index 0000000..5453c44
--- /dev/null
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
+"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">
+
+<svg xmlns="http://www.w3.org/2000/svg"
+     xmlns:xlink="http://www.w3.org/1999/xlink"
+     width="400" height="400">
+
+<defs>
+       <g id="recursive1" transform="scale(0.5)">
+               <rect x="0" y="0" width="200" height="200" stroke="black" fill="none"/>
+               <use xlink:href="#recursive2"/>
+       </g>
+       <g id="recursive2" transform="scale(0.5)">
+               <rect x="0" y="0" width="200" height="200" stroke="black" fill="none"/>
+               <use xlink:href="#recursive1"/>
+       </g>
+</defs>
+
+       <use xlink:href="#recursive1"/>
+
+</svg>
index e840314..dec9902 100644 (file)
                transform="translate(100,100)"
     />
     
+    <rect x="0" y="0" width="100" height="100" stroke="purple" fill="none"
+               transform="translate(100,100) translate(-100,-100)"
+    />
+    
     <rect x="100" y="50" width="25" height="25" stroke="green" fill="none"
                transform="scale(2,2)"
        />
        
-       <!--<rect x="200" y="150" width="50" height="75" stroke="red" fill="none"
+       
+       <g transform="matrix(1,-0.1,0,1,-0.1,0) translate(50,0)">
+               <line x1="200" y1="150" x2="250" y2="150" stroke="black"/>
                
-       />-->
+               <line x1="250" y1="150" x2="250" y2="225" stroke="black"/>
+               <line x1="250" y1="225" x2="200" y2="225" stroke="black"/>
+               <line x1="200" y1="225" x2="200" y2="150" stroke="black"/>
+       </g>
+       <path stroke="navy" fill="none"
+               d = "M 200,150 L 250,150 250,225 200,225 Z"
+               transform="translate(20,20) matrix(1,0.1,0,1,0.1,0)"/>
+               
+       <path stroke="pink" fill="none"
+               d = "m 200,150 l 50,0 0,75 -50,0 z"
+               transform="translate(20,20) matrix(1,0.1,0,1,0.1,0)"/>
+       
     
 </svg>

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