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lwpolyline.js
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lwpolyline.js
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import * as helpers from '../ParseHelpers'
export default function EntityParser() {}
EntityParser.ForEntityName = 'LWPOLYLINE';
EntityParser.prototype.parseEntity = function(scanner, curr) {
var entity = { type: curr.value, vertices: [] },
numberOfVertices = 0;
curr = scanner.next();
while(curr !== 'EOF') {
if(curr.code === 0) break;
switch(curr.code) {
case 38:
entity.elevation = curr.value;
break;
case 39:
entity.depth = curr.value;
break;
case 70: // 1 = Closed shape, 128 = plinegen?, 0 = default
entity.shape = ((curr.value & 1) === 1);
entity.hasContinuousLinetypePattern = ((curr.value & 128) === 128);
break;
case 90:
numberOfVertices = curr.value;
break;
case 10: // X coordinate of point
entity.vertices = parseLWPolylineVertices(numberOfVertices, scanner);
break;
case 43:
if(curr.value !== 0) entity.width = curr.value;
break;
case 210:
entity.extrusionDirectionX = curr.value;
break;
case 220:
entity.extrusionDirectionY = curr.value;
break;
case 230:
entity.extrusionDirectionZ = curr.value;
break;
default:
helpers.checkCommonEntityProperties(entity, curr);
break;
}
curr = scanner.next();
}
return entity;
};
function parseLWPolylineVertices(n, scanner) {
if(!n || n <= 0) throw Error('n must be greater than 0 verticies');
var vertices = [], i;
var vertexIsStarted = false;
var vertexIsFinished = false;
var curr = scanner.lastReadGroup;
for(i = 0; i < n; i++) {
var vertex = {};
while(curr !== 'EOF') {
if(curr.code === 0 || vertexIsFinished) break;
switch(curr.code) {
case 10: // X
if(vertexIsStarted) {
vertexIsFinished = true;
continue;
}
vertex.x = curr.value;
vertexIsStarted = true;
break;
case 20: // Y
vertex.y = curr.value;
break;
case 30: // Z
vertex.z = curr.value;
break;
case 40: // start width
vertex.startWidth = curr.value;
break;
case 41: // end width
vertex.endWidth = curr.value;
break;
case 42: // bulge
if(curr.value != 0) vertex.bulge = curr.value;
break;
default:
// if we do not hit known code return vertices. Code might belong to entity
if (vertexIsStarted) {
vertices.push(vertex);
}
return vertices;
}
curr = scanner.next();
}
// See https://groups.google.com/forum/#!topic/comp.cad.autocad/9gn8s5O_w6E
vertices.push(vertex);
vertexIsStarted = false;
vertexIsFinished = false;
}
scanner.rewind();
return vertices;
};