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Java example source code file (Legend.ts)

This example Java source code file (Legend.ts) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

ffffff, legend

The Legend.ts Java example source code

/*
 *
 *  * Copyright 2016 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
 *
 */

class Legend {

    //TODO: make these configurable...
    private static offsetX: number = 15;
    private static offsetY: number = 15;
    private static padding: number = 8;
    private static separation: number = 12;
    private static boxSize: number = 10;
    private static fillColor: string = "#FFFFFF";
    private static legendOpacity: number = 0.75;
    private static borderStrokeColor: string = "#000000";


    static legendFn = (function(g: any) {
        //Get SVG and legend box/items:
        var svg = d3.select(g.property("nearestViewportElement"));
        var legendBox = g.selectAll(".outerRect").data([true]);
        var legendItems = g.selectAll(".legendElement").data([true]);

        legendBox.enter().append("rect").attr("class","outerRect");
        legendItems.enter().append("g").attr("class","legendElement");

        var legendElements: any[] = [];
        svg.selectAll("[data-legend]").each(function() {
            var thisVar = d3.select(this);
            legendElements.push({
                label: thisVar.attr("data-legend"),
                color: thisVar.style("fill")
            });
        });


        //Add rectangles for color
        legendItems.selectAll("rect")
            .data(legendElements,function(d) { return d.label})
            .call(function(d) { d.enter().append("rect")})
            .call(function(d) { d.exit().remove()})
            .attr("x",0)
            .attr("y",function(d,i) { return i*Legend.separation-Legend.boxSize+"px"})
            .attr("width",Legend.boxSize)
            .attr("height",Legend.boxSize)
            //.style("fill",function(d) { return d.value.color});
            .style("fill",function(d) { return d.color});

        //Add labels
        legendItems.selectAll("text")
            .data(legendElements,function(d) { return d.label})
            .call(function(d) { d.enter().append("text")})
            .call(function(d) { d.exit().remove()})
            .attr("y",function(d,i) { return i*Legend.separation + "px"})
            .attr("x",(Legend.padding + Legend.boxSize) + "px")
            .text(function(d) { return d.label});

        //Add the outer box
        var legendBoundingBox: any = legendItems[0][0].getBBox();
        legendBox.attr("x",(legendBoundingBox.x-Legend.padding))
            .attr("y",(legendBoundingBox.y-Legend.padding))
            .attr("height",(legendBoundingBox.height+2*Legend.padding))
            .attr("width",(legendBoundingBox.width+2*Legend.padding))
            .style("fill",Legend.fillColor)
            .style("stroke",Legend.borderStrokeColor)
            .style("opacity",Legend.legendOpacity);

        svg.selectAll(".legend").attr("transform","translate(" + Legend.offsetX + "," + Legend.offsetY + ")");
    });
}

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