sl-sfy-safety/src/views/cameras/algo-params-setting/components/CameraViewSetting/constants.ts

/** canvas的实际宽度 */
export const canvasWidth = 1920;
export const canvasHeight = 1080;
/** 视频的比例 */
const videoRatio = canvasHeight / canvasWidth;

/** dom展示出来的宽度，由于屏幕大小限制，完全按照1920来展示，一屏显示不下，所以要进行一定的缩放 */
export const domWidth = 960;
export const domHeight = domWidth * videoRatio;
export const scale = domWidth / canvasWidth;