this.handler.setInputAction(function (evt) { //单机开始绘制

var cartesian = that.getCatesian3FromPX(evt.position, that.viewer, [that.polyline, that.floatLable]);

if (!cartesian) return;

if (that.positions.length == 0) {

var label = that.createLabel(cartesian, "起点");

that.labels.push(label);

that.floatLable = that.createLabel(cartesian, "");

that.floatLable.show = false;

that.positions.push(cartesian);

that.positions.push(cartesian.clone());

that.lastCartesian = cartesian;

} else {

that.floatLable.show = false;

that.positions.push(cartesian);

if (!that.lastCartesian) return;

var distance = that.getLength(cartesian, that.lastCartesian);

that.allDistance += distance;

var text = that.formatLength(distance);

var label = that.createLabel(cartesian, text);

that.labels.push(label);

}

that.lastCartesian = cartesian;

}, Cesium.ScreenSpaceEventType.LEFT_CLICK);

this.handler.setInputAction(function (evt) {

if (that.positions.length < 1) return;

that.floatLable.show = true;

var cartesian = that.getCatesian3FromPX(evt.endPosition, that.viewer, [that.polyline, that.floatLable]);

if (!cartesian) return;

if (that.positions.length == 2) {

if (!Cesium.defined(that.polyline)) {

that.polyline = that.createLine();

}

}

if (that.polyline) {

that.positions.pop();

that.positions.push(cartesian);

if (!that.lastCartesian) return;

var distance = that.getLength(cartesian, that.lastCartesian);

that.floatLable.show = true;

that.floatLable.label.text = that.formatLength(distance);

that.floatLable.position.setValue(cartesian);

}

}, Cesium.ScreenSpaceEventType.MOUSE_MOVE);

this.handler.setInputAction(function (evt) {

if (!that.polyline) return;

that.floatLable.show = false;

that.viewer.scene.camera.lookAtTransform(Cesium.Matrix4.IDENTITY);

that.viewer.trackedEntity = undefined;

var cartesian = that.getCatesian3FromPX(evt.position, that.viewer, [that.polyline, that.floatLable]);

var distanceLast = that.getLength(cartesian, that.lastCartesian);

that.allDistance += distanceLast;

var allDistance = that.formatLength(that.allDistance);

var label = that.createLabel(cartesian, "");

if (!cartesian) return;

that.labels.push(label);

that.labels[that.labels.length - 1].label.text = "总长：" + allDistance;

if (that.handler) {

that.handler.destroy();

that.handler = null;

}

if (that.tsLabel) {

that.viewer.entities.remove(that.tsLabel);

}

if (that.ts_handler) {

that.ts_handler.destroy();

that.ts_handler = null;

}

}, Cesium.ScreenSpaceEventType.RIGHT_CLICK);