Speeding up the zoom and zoom function of the map drawn with Javascript canvas

111 Views Asked by At

I draw a map with Javascript and leave the pictures of the players in each cell of this map.

I've made good progress so far. Now I am zooming in and zooming out in this project.

The length of the map will be 1000x1000. I'm redrawing with each zoom operation. This causes slowdown. He also draws incorrectly.

I didn't know exactly how to find a solution.

My codes are as follows. Thanks in advance to those who will help.

var defaultMap = [
        [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
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    ];
    
    var images = [
        {
            name: "player 1",
            position: [
                {
                    x: [0, 0, 4],
                    y: [0, 0, 2]
                }
            ]
        },
        {
            name: "player 2",
            position: [
                {
                    x: [0, 7, 9],
                    y: [0, 2, 5]
                }
            ]
        },
        {
            name: "player 3",
            position: [
                {
                    x: [6, 7, 9],
                    y: [6, 6, 8]
                }
            ]
        }
    ];

    const canvas = document.getElementById("main");
    const ctx = canvas.getContext("2d");

    function drawMap(scale, translate){
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        ctx.save();
        ctx.translate(translate.x, translate.y);
        ctx.scale(scale, scale);

        ctx.lineWidth = .5;
        const p = ctx.lineWidth / 1;

        for (let xCell = 0; xCell < defaultMap.length; xCell++) {
            for (let yCell = 0; yCell < defaultMap[xCell].length; yCell++) {
                const x = xCell * 20;
                const y = yCell * 20;
                const img = new Image();
                if (defaultMap[xCell][yCell] === 1) {
                    img.onload = function() {
                        ctx.drawImage(img, y+p, x+p, 20-p*2, 20-p*2);
                    };
                    
                    img.src = `https://besthqwallpapers.com/Uploads/5-6-2020/134999/thumb-black-ground-texture-macro-grunge-textures-black-backgrounds-ground-textures.jpg`;
                }
            
            }
        }

        var width = 1, height = 1
        for (let i = 0; i < images.length; i++) {
            var x = images[i].position[0].x[0], y = images[i].position[0].y[0];
            
            var playerImage = new Image();
            playerImage.onload = function() {
                var getX = 20*images[i].position[0].x[1]+p
                var getY = 20*images[i].position[0].y[1]+p
                for(var w = images[i].position[0].x[1]; w < images[i].position[0].x[2]; w++){
                    width += +1
                }

                for(var h = images[i].position[0].y[1]; h < images[i].position[0].y[2]; h++){
                    height += +1
                }

                /* console.log(images[i].name + " => width: " + width*20 + "px\n" + images[i].name + " => height: " + height*20 + "px") */
                ctx.drawImage(playerImage, getX, getY, 20*width-p*2, 20*height-p*2);
                width = 1, height = 1
            };
            playerImage.src = `https://playerbros.com/wp-content/uploads/2019/01/Awaken-League-of-Legends-lol-wallpaper-lol-duvar-resimleri.jpg`;
            
        }
    }
    
    window.onload = function() {

        var translate = {
            x: 0,
            y: 0
        };

        var scale = 1.0;
        var scaleMultiplier = 0.8;
        var startDragOffset = {};
        var mouseDown = false;

        canvas.addEventListener("mousedown", function(evt){
            mouseDown = true;
            startDragOffset.x = evt.clientX - translate.x;
            startDragOffset.y = evt.clientY - translate.y;
        });

        canvas.addEventListener("mouseup", function(evt){
            mouseDown = false;
        });

        canvas.addEventListener("mouseover", function(evt){
            mouseDown = false;
        });

        canvas.addEventListener("mouseout", function(evt){
            mouseDown = false;
        });

        canvas.addEventListener("mousemove", function(evt){
            if (mouseDown) {
                translate.x = evt.clientX - startDragOffset.x;
                translate.y = evt.clientY - startDragOffset.y;
                drawMap(scale, translate);
            }
        });

        document.getElementById("plus").addEventListener("click", function(){
            scale /= scaleMultiplier;
            drawMap(scale, translate)
        }, false);

        document.getElementById("minus").addEventListener("click", function(){
            scale *= scaleMultiplier;
            drawMap(scale, translate)
        }, false);

        drawMap(scale, translate)


    };
        
.wr {
        position: relative;
        width: fit-content;
        height: fit-content;
    }

    .wr canvas {
        padding: 3px;
        border: 1px solid blue;
    }
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<div class="wr">
        <canvas id="main" width="500" height="500"></canvas>
        
        </canvas>
        <div class="buttons">
            <button type="button" id="plus">+</button>
            <button type="button" id="minus">-</button>
        </div>
    </div>

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