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Merge pull request #32 from ccbrown/master 

SVG import fixes and support
This commit is contained in:
Viktor Chlumský 2017-01-26 08:56:24 +01:00 committed by GitHub
parent 2ab2e6186c 60feec1a33
commit 0215653a8a
1 changed files with 47 additions and 34 deletions
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81
ext/import-svg.cpp
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@ -52,6 +52,15 @@ static bool readDouble(double &output, const char *&pathDef) {
return false;
}
static void consumeOptionalComma(const char *&pathDef) {
while (*pathDef == ' ') {
++pathDef;
}
if (*pathDef == ',') {
++pathDef;
}
}
static bool buildFromPath(Shape &shape, const char *pathDef) {
char nodeType;
Point2 prevNode(0, 0);
@ -66,79 +75,83 @@ static bool buildFromPath(Shape &shape, const char *pathDef) {
while (true) {
switch (nodeType) {
case 'M':
REQUIRE(contourStart);
REQUIRE(readCoord(node, pathDef));
startPoint = node;
nodeType = 'L';
break;
case 'm':
REQUIRE(contourStart);
REQUIRE(readCoord(node, pathDef));
node += prevNode;
if (nodeType == 'm') {
node += prevNode;
}
startPoint = node;
nodeType = 'l';
--nodeType; // to 'L' or 'l'
break;
case 'Z':
case 'z':
if (prevNode != startPoint)
contour.addEdge(new LinearSegment(prevNode, startPoint));
prevNode = startPoint;
goto NEXT_CONTOUR;
case 'L':
REQUIRE(readCoord(node, pathDef));
contour.addEdge(new LinearSegment(prevNode, node));
break;
case 'l':
REQUIRE(readCoord(node, pathDef));
node += prevNode;
if (nodeType == 'l') {
node += prevNode;
}
contour.addEdge(new LinearSegment(prevNode, node));
break;
case 'H':
REQUIRE(readDouble(node.x, pathDef));
contour.addEdge(new LinearSegment(prevNode, node));
break;
case 'h':
REQUIRE(readDouble(node.x, pathDef));
node.x += prevNode.x;
if (nodeType == 'h') {
node.x += prevNode.x;
}
contour.addEdge(new LinearSegment(prevNode, node));
break;
case 'V':
REQUIRE(readDouble(node.y, pathDef));
contour.addEdge(new LinearSegment(prevNode, node));
break;
case 'v':
REQUIRE(readDouble(node.y, pathDef));
node.y += prevNode.y;
if (nodeType == 'v') {
node.y += prevNode.y;
}
contour.addEdge(new LinearSegment(prevNode, node));
break;
case 'Q':
REQUIRE(readCoord(controlPoint[0], pathDef));
REQUIRE(readCoord(node, pathDef));
contour.addEdge(new QuadraticSegment(prevNode, controlPoint[0], node));
break;
case 'q':
REQUIRE(readCoord(controlPoint[0], pathDef));
consumeOptionalComma(pathDef);
REQUIRE(readCoord(node, pathDef));
controlPoint[0] += prevNode;
node += prevNode;
if (nodeType == 'q') {
controlPoint[0] += prevNode;
node += prevNode;
}
contour.addEdge(new QuadraticSegment(prevNode, controlPoint[0], node));
break;
// TODO T, t
case 'C':
REQUIRE(readCoord(controlPoint[0], pathDef));
REQUIRE(readCoord(controlPoint[1], pathDef));
REQUIRE(readCoord(node, pathDef));
contour.addEdge(new CubicSegment(prevNode, controlPoint[0], controlPoint[1], node));
break;
case 'c':
REQUIRE(readCoord(controlPoint[0], pathDef));
consumeOptionalComma(pathDef);
REQUIRE(readCoord(controlPoint[1], pathDef));
consumeOptionalComma(pathDef);
REQUIRE(readCoord(node, pathDef));
controlPoint[0] += prevNode;
controlPoint[1] += prevNode;
node += prevNode;
if (nodeType == 'c') {
controlPoint[0] += prevNode;
controlPoint[1] += prevNode;
node += prevNode;
}
contour.addEdge(new CubicSegment(prevNode, controlPoint[0], controlPoint[1], node));
break;
case 'S':
case 's':
controlPoint[0] = node * 2 - controlPoint[1];
REQUIRE(readCoord(controlPoint[1], pathDef));
consumeOptionalComma(pathDef);
REQUIRE(readCoord(node, pathDef));
if (nodeType == 's') {
controlPoint[1] += prevNode;
node += prevNode;
}
contour.addEdge(new CubicSegment(prevNode, controlPoint[0], controlPoint[1], node));
break;
// TODO S, s
// TODO A, a
default:
REQUIRE(false);