// widget_circuralslider.ysl2

template "widget[@type='CircularSlider']", mode="widget_class"

||

class CircularSliderWidget extends Widget{

frequency = 5;

range = undefined;

circle = undefined;

handle_pos = undefined;

drag = false;

enTimer = false;

dispatch(value) {

if(!this.drag){

if(this.value_elt)

this.value_elt.textContent = String(value);

this.handle_position(value);

}

}

handle_position(value){

let [min,max,totalDistance] = this.range;

let length = Math.max(0,Math.min((totalDistance),(Number(value)-min)/(max-min)*(totalDistance)));

let tip = this.range_elt.getPointAtLength(length);

this.handle_elt.setAttribute('transform',"translate("+(tip.x-this.handle_pos.x)+","+(tip.y-this.handle_pos.y)+")");

}

on_release(evt) {

if(this.drag){

this.drag = false;

}

}

update_position(evt){

if(this.drag && this.enTimer){

var svg_dist = 0;

//calculate center of widget in html

// --TODO maybe it would be better to bind this part to window change size event ???

let [xdest,ydest,svgWidth,svgHeight] = page_desc[current_visible_page].bbox;

let [cX, cY,fiStart,fiEnd,minMax,x1,y1,width,height] = this.circle;

let htmlCirc = this.range_elt.getBoundingClientRect();

let cxHtml = ((htmlCirc.right-htmlCirc.left)/(width)*(cX-x1))+htmlCirc.left;

let cyHtml = ((htmlCirc.bottom-htmlCirc.top)/(height)*(cY-y1))+htmlCirc.top;

//get mouse coordinates

let mouseX = undefined;

let mouseY = undefined;

if (evt.type.startsWith("touch")){

mouseX = Math.ceil(evt.touches[0].clientX);

mouseY = Math.ceil(evt.touches[0].clientY);

}

else{

mouseX = evt.pageX;

mouseY = evt.pageY;

}

//calculate angle

let fi = Math.atan2(cyHtml-mouseY, mouseX-cxHtml);

// transform from 0 to 2PI

if (fi > 0){

fi = 2*Math.PI-fi;

}

else{

fi = -fi;

}

//offset it to 0

fi = fi - fiStart;

if (fi < 0){

fi = fi + 2*Math.PI;

}

//get handle distance from mouse position

if(fi<fiEnd){

svg_dist=(fi)/(fiEnd)*(this.range[1]-this.range[0]);

}

else if(fiEnd<fi && fi<fiEnd+minMax){

svg_dist = this.range[1];

}

else{

svg_dist = this.range[0];

}

//redraw handle --TODO is it fast enough if I just call change_hmi_value???

this.handle_position(svg_dist);

if(this.value_elt)

this.value_elt.textContent = String(Math.ceil(svg_dist));

change_hmi_value(this.indexes[0], "="+Math.ceil(svg_dist));

//reset timer

this.enTimer = false;

setTimeout("{hmi_widgets['"+this.element_id+"'].enTimer = true;}", 100);

}

}

on_select(evt){

this.drag = true;

this.enTimer = true;

this.update_position(evt);

}

init() {

//get min max

let min = this.min_elt ?

Number(this.min_elt.textContent) :

this.args.length >= 1 ? this.args[0] : 0;

let max = this.max_elt ?

Number(this.max_elt.textContent) :

this.args.length >= 2 ? this.args[1] : 100;

//fiStart ==> offset

let fiStart = Number(this.range_elt.getAttribute('sodipodi:start'));

let fiEnd = Number(this.range_elt.getAttribute('sodipodi:end'));

fiEnd = fiEnd - fiStart;

//fiEnd ==> size of angle

if (fiEnd < 0){

fiEnd = 2*Math.PI + fiEnd;

}

//min max barrier angle

let minMax = (2*Math.PI - fiEnd)/2;

//get parameters from svg

let cX = Number(this.range_elt.getAttribute('sodipodi:cx'));

let cY = Number(this.range_elt.getAttribute('sodipodi:cy'));

this.range_elt.style.strokeMiterlimit="0"; //eliminates some weird border around html object

this.range = [min, max,this.range_elt.getTotalLength()];

let cPos = this.range_elt.getBBox();

this.handle_pos = this.range_elt.getPointAtLength(0);

this.circle = [cX, cY,fiStart,fiEnd,minMax,cPos.x,cPos.y,cPos.width,cPos.height];

//init events

this.handle_elt.addEventListener("touchstart", hmi_widgets[this.element_id].on_select.bind(this));

this.handle_elt.addEventListener("mousedown", hmi_widgets[this.element_id].on_select.bind(this));

this.element.addEventListener("mousedown", hmi_widgets[this.element_id].on_select.bind(this));

window.addEventListener("touchmove", hmi_widgets[this.element_id].update_position.bind(this));

window.addEventListener("mousemove", hmi_widgets[this.element_id].update_position.bind(this));

window.addEventListener("mouseup", hmi_widgets[this.element_id].on_release.bind(this))

window.addEventListener("touchend", hmi_widgets[this.element_id].on_release.bind(this));

window.addEventListener("touchcancel", hmi_widgets[this.element_id].on_release.bind(this));

}

}

||

template "widget[@type='CircularSlider']", mode="widget_defs" {

param "hmi_element";

labels("handle range");

optional_labels("value min max");

|,

}