micro:bit fast icon display

fasticon.ts

// save as custom.ts

namespace basic {
    /**
    * Draws the selected icon on the LED screen without delay
    * @param icon the predefined icon id
    */
    //% weight=90 blockGap=8
    //% blockId=basic_fast_icon
    //% block="fast icon %i" icon="\uf00a"
    //% parts="ledmatrix"
    //% icon.fieldEditor="imagedropdown"
    //% icon.fieldOptions.columns="5"
    //% icon.fieldOptions.width="380"
    //% icon.fieldOptions.maxRows=4
    export function fastIcon(icon: IconNames) {
        let res = images.iconImage(icon)
        res.showImage(0, 0)
    }

    /**
     * Draws an arrow on the LED screen without delay
     * @param direction the direction of the arrow
     */
    //% weight=50 blockGap=8
    //% blockId=basic_fast_arrow
    //% block="fast arrow %i=device_arrow"
    //% parts="ledmatrix"
    export function fastArrow(direction: number) {
        let res = images.arrowImage(direction)
        res.showImage(0, 0)
    }
}