Question

How to bring the Point at to the right place into the canvas?

let canvas = []
let canvasHeight  = process.stdout.getWindowSize()[1] -25
let canvasWidth = process.stdout.getWindowSize()[0]
function createCanvas (){
        for(i = 0; canvasHeight > i; i++){
                const row = []
                for(j = 0; canvasWidth > j; j++){

                row.push(" ")

                }
                canvas.push(row)
        }




}
createCanvas()


function createAPointIntoTheCanvas (x,y) {
if(x>= 0 &&x < canvasWidth && y >= 0 && y < canvasHeight){
        canvas[x][y] = "+"
}

}
createAPointIntoTheCanvas(5,5)


console.log(canvas.join(" "))

The problem is that the point is written to the canvas but into the wrong place. Written with NodeJs

PS: Please copy the sourcecode into a js file. Afterwards start the file with node nameOfYourFile.js.

Answer 1

问题必须是:

let canvasHeight  = process.stdout.getWindowSize()[1] -25

It results in a height of 0 if the window is small. If I set the width and height manually your code works.

let canvas = []
let canvasHeight  = 5  //process.stdout.getWindowSize()[1] -25
let canvasWidth = 5    //process.stdout.getWindowSize()[0]

//...

createCanvas()
createAPointIntoTheCanvas(2,2)
console.log(canvas)

结果:<代码>+> 载于2,2

[
  [    ,    ,    ,    ,     ],
  [    ,    ,    ,    ,     ],
  [    ,    ,  + ,    ,     ],
  [    ,    ,    ,    ,     ],
  [    ,    ,    ,    ,     ]
]

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