165     let endX = this.points!.endX!;
185 …      line.slice(this.getCurrentLineBackSize(line, startX - x, true)) + (endX < x + w ? '\n' : '');
189               this.getCurrentLineBackSize(line, endX - x, false)
193           selectedText += `${line.slice(0, this.getCurrentLineBackSize(line, endX - x, false))}\n`;
202   forwardSelected(startX: number, startY: number, endX: number, endY: number): void {
210       this.shellCanvasCtx!.fillRect(startX, startY, endX - startX, endY - startY);
213       endPointX = endX;
228             endX - SpWebHdcShell.LEFT_OFFSET,
231           endPointX = endX;
244     this.points = { startX: startPointX, startY: startPointY, endX: endPointX, endY: endPointY };
266   reverseSelected(startX: number, startY: number, endX: number, endY: number): void {
274       this.shellCanvasCtx!.fillRect(endX, endY, startX - endX, startY - endY);
275       startPointX = endX;
289 …this.shellCanvasCtx!.fillRect(endX, endY, this.shellCanvas!.width - endX, startY - (index - 1) * 1…
290           startPointX = endX;
298     this.points = { startX: startPointX, startY: startPointY, endX: endPointX, endY: endPointY };
584     let endX: number;  variable
603       endX = event.offsetX;
610         that.forwardSelected(startX, startY, endX, endY);
613         that.reverseSelected(startX, startY, endX, endY);
646   endX: number | undefined;  property in Point