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(function(){

function d3_plot(container) {
    this.opt = {
	w:550, h:200, margin:30
    };
    this.element = container.append("svg:g")    
	.classed("d3.plot_plot",true)
	.attr("width", this.opt.w)
	.attr("height", this.opt.h);

    this.element.append("svg:rect")
	.attr("width", this.opt.w)
	.attr("height", this.opt.h)
	.style("fill", "white");
   
    this.element.append("svg:text")
	.classed("d3-plot_wait", true)
	.attr("x", this.opt.w/2)
	.attr("y", this.opt.h/2)
        .attr("text-anchor", "center")
	.text("Bitte warten");
};

d3_plot.prototype = {
    draw: function(data) {
	var x_min = d3.min(data, function(d){return d[0];}),
        x_max = d3.max(data, function(d){return d[0];}),
        y_min = d3.min(data, function(d){return d[1];}),
        y_max = d3.max(data, function(d){return d[1];});

	var x = d3.time.scale()
            .domain([x_min, x_max])
            .range([0+this.opt.margin, this.opt.w-this.opt.margin]);
	
	var y = d3.scale.linear()
            .domain([y_min, y_max])
            .range([0+this.opt.margin, this.opt.h-(this.opt.margin/2)]);

	
	var g = this.element.append("svg:g")
            .attr("transform", "translate(0, "+this.opt.h+")");

	var line = d3.svg.line()
            .x(function(d,i){ return x(d[0]); })
            .y(function(d) {return -1*y(d[1]);});

	g.append("svg:path")
            .attr("d", line(data));

	// Axes X-Line
	g.append("svg:line")
            .attr("x1", 0)
            .attr("y1", -1*y(y_min))
            .attr("x2", x(x_max))
            .attr("y2", -1 * y(y_min));
        
	
	// Tick Labels
	var tick_format = d3.time.format("%d.%m");
	g.selectAll(".xlabel")
            .data(x.ticks(5)).enter()
            .append("svg:text")
            .text(function(d){return tick_format(d);})
            .attr("x", function(d) {return x(d);})
            .attr("y", -5)
            .attr("text-anchor", "center");

	g.selectAll(".ylabel")
            .data(y.ticks(5)).enter()
            .append("svg:text")
            .text(String)
            .attr("x", 0)
            .attr("y", function(d) {return -1*y(d);})
            .attr("text-anchor", "right");

	// X-Lines
	g.selectAll(".xlines")
            .data(x.ticks(5)).enter()
            .append("svg:line")
            .style("fill", "none")
            .style("stroke", "#000000")
            .style("stroke-width", 0.5)
            .style("stroke-dasharray", "6,1")
            .attr("x1", function(d){return x(d);})
            .attr("y1", -1*y(y_min)+(this.opt.margin/3))
            .attr("x2", function(d){return x(d);})
            .attr("y2", -1*y(y_max));

	//
	this.element.select(".d3-plot_wait").style("display","none");
    }
};

d3.plot = function(container) {
    return new d3_plot(container);
};

})();