bpmn-js/test/integration/custom-elements/CustomRenderer.js

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'use strict';
var inherits = require('inherits');
var BaseRenderer = require('diagram-js/lib/draw/BaseRenderer');
var componentsToPath = require('diagram-js/lib/util/RenderUtil').componentsToPath;
var svgAppend = require('tiny-svg/lib/append'),
svgAttr = require('tiny-svg/lib/attr'),
svgCreate = require('tiny-svg/lib/create');
function CustomRenderer(eventBus, styles) {
BaseRenderer.call(this, eventBus, 2000);
this._styles = styles;
var self = this;
var computeStyle = styles.computeStyle;
this.handlers = {
'custom:triangle': function(parentGfx, element) {
return self.drawTriangle(parentGfx, element.width);
},
'custom:circle': function(parentGfx, element, attrs) {
return self.drawCircle(parentGfx, element.width, element.height, attrs);
}
};
this.drawTriangle = function(parentGfx, side, attrs) {
var halfSide = side / 2,
points;
points = [{ x: halfSide, y: 0 }, { x: side, y: side }, { x: 0, y: side }];
var pointsString = points.map(function(point) {
return point.x + ',' + point.y;
}).join(' ');
attrs = computeStyle(attrs, {
stroke: '#3CAA82',
strokeWidth: 2,
fill: '#3CAA82'
});
var polygon = svgCreate('polygon');
svgAttr(polygon, { points: pointsString });
svgAttr(polygon, attrs);
svgAppend(parentGfx, polygon);
return polygon;
};
this.getTrianglePath = function(element) {
var x = element.x,
y = element.y,
width = element.width,
height = element.height;
var trianglePath = [
['M', x + width / 2, y],
['l', width / 2, height],
['l', -width, 0 ],
['z']
];
return componentsToPath(trianglePath);
};
this.drawCircle = function(parentGfx, width, height, attrs) {
var cx = width / 2,
cy = height / 2;
attrs = computeStyle(attrs, {
stroke: '#4488aa',
strokeWidth: 4,
fill: 'white'
});
var circle = svgCreate('circle');
svgAttr(circle, {
cx: cx,
cy: cy,
r: Math.round((width + height) / 4)
});
svgAttr(circle, attrs);
svgAppend(parentGfx, circle);
return circle;
};
this.getCirclePath = function(shape) {
var cx = shape.x + shape.width / 2,
cy = shape.y + shape.height / 2,
radius = shape.width / 2;
var circlePath = [
['M', cx, cy],
['m', 0, -radius],
['a', radius, radius, 0, 1, 1, 0, 2 * radius],
['a', radius, radius, 0, 1, 1, 0, -2 * radius],
['z']
];
return componentsToPath(circlePath);
};
}
inherits(CustomRenderer, BaseRenderer);
module.exports = CustomRenderer;
CustomRenderer.$inject = [ 'eventBus', 'styles' ];
CustomRenderer.prototype.canRender = function(element) {
return /^custom\:/.test(element.type);
};
CustomRenderer.prototype.drawShape = function(visuals, element) {
var type = element.type;
var h = this.handlers[type];
/* jshint -W040 */
return h(visuals, element);
};
CustomRenderer.prototype.drawConnection = function(visuals, element) {
var type = element.type;
var h = this.handlers[type];
/* jshint -W040 */
return h(visuals, element);
};
CustomRenderer.prototype.getShapePath = function(element) {
var type = element.type.replace(/^custom\:/, '');
var shapes = {
triangle: this.getTrianglePath,
circle: this.getCirclePath
};
return shapes[type](element);
};