Question

我想绘制可以旋转，拖动和调整大小的图像。我创建了一个JSFiddle：https://jsfiddle.net/iu1340/esrfydsL/

我可以拖动并调整大小

但是当我旋转图像时，节点的位置是错误的

以下是我使用的代码：

＆＃13;

		var width = window.innerWidth;
    var height = window.innerHeight;

    function update(activeAnchor) {
        var group = activeAnchor.getParent();

        var topLeft = group.get('.topLeft')[0];
        var topRight = group.get('.topRight')[0];
        var bottomRight = group.get('.bottomRight')[0];
        var bottomLeft = group.get('.bottomLeft')[0];
        var image = group.get('Image')[0];

        var anchorX = activeAnchor.getX();
        var anchorY = activeAnchor.getY();
				
        var rotateFlage = false;
        var dir =0;
        // update anchor positions
        switch (activeAnchor.getName()) {
            case 'topLeft':
                topRight.setY(anchorY);
                bottomLeft.setX(anchorX);
                break;
            case 'topRight':
                rotateFlage=true;
        				var diffx = Math.abs(topRight.getX()-topLeft.getX());
        				var diffy = Math.abs(topRight.getY()-topLeft.getY());
        				var dir=180*Math.atan(diffy/diffx)/(Math.PI);
                break;
            case 'bottomRight':
                bottomLeft.setY(anchorY);
                topRight.setX(anchorX);
                break;
            case 'bottomLeft':
                bottomRight.setY(anchorY);
                topLeft.setX(anchorX);
                break;
        }

        image.position(topLeft.position());
				
        if(rotateFlage){
        	image.rotation(dir);
        }
        else{
          var width = topRight.getX() - topLeft.getX();
          var height = bottomLeft.getY() - topLeft.getY();
        	if(width && height) {
            image.width(width);
            image.height(height);
        	}
        }
    }
    function addAnchor(group, x, y, name) {
        var stage = group.getStage();
        var layer = group.getLayer();

        var anchor = new Konva.Circle({
            x: x,
            y: y,
            stroke: '#666',
            fill: '#ddd',
            strokeWidth: 2,
            radius: 8,
            name: name,
            draggable: true,
            dragOnTop: false
        });

        anchor.on('dragmove', function() {
            update(this);
            layer.draw();
        });
        anchor.on('mousedown touchstart', function() {
            group.setDraggable(false);
            this.moveToTop();
        });
        anchor.on('dragend', function() {
            group.setDraggable(true);
            layer.draw();
        });
        // add hover styling
        anchor.on('mouseover', function() {
            var layer = this.getLayer();
            document.body.style.cursor = 'pointer';
            this.setStrokeWidth(4);
            layer.draw();
        });
        anchor.on('mouseout', function() {
            var layer = this.getLayer();
            document.body.style.cursor = 'default';
            this.setStrokeWidth(2);
            layer.draw();
        });

        group.add(anchor);
    }

    var stage = new Konva.Stage({
        container: 'container',
        width: width,
        height: height
    });

    var layer = new Konva.Layer();
    stage.add(layer);

    // darth vader
    var darthVaderImg = new Konva.Image({
        width: 200,
        height: 137
    });

    var darthVaderGroup = new Konva.Group({
        x: 180,
        y: 50,
        draggable: true
    });
    layer.add(darthVaderGroup);
    darthVaderGroup.add(darthVaderImg);
    addAnchor(darthVaderGroup, 0, 0, 'topLeft');
    addAnchor(darthVaderGroup, 200, 0, 'topRight');
    addAnchor(darthVaderGroup, 200, 138, 'bottomRight');
    addAnchor(darthVaderGroup, 0, 138, 'bottomLeft');
    
    var imageObj1 = new Image();
    imageObj1.onload = function() {
        darthVaderImg.image(imageObj1);
        layer.draw();
    };
    imageObj1.src = 'http://konvajs.github.io/assets/darth-vader.jpg';

＆＃13;

如何解决此问题？

Answer 1

这本身不是解决方案。

但是你需要一些对象来处理调整大小。您需要另一个单独的对象来处理旋转。

按照您通常在ms字或其他类似程序中看到的模式。

KEYS command

角落处的节点和边缘的中点起到缩放/拉伸图像的作用......箭头东西用于旋转。

konva.js拖动并旋转

1 个答案: