2

マウスを使用して描画している線の始点と終点に矢印を追加しようとしています。線を描画するためのスクリプトは次のとおりです。

    document.getElementById('dLine').onclick = function() {
    layer.on("mousedown", function () {
        if (moving) {
            moving = false;
            layer.draw();
        } else {
            var mousePos = stage.getMousePosition();
            x1 = mousePos.x;
            y1 = mousePos.y;
            line = new Kinetic.Line({
                points: [0, 0, 50, 50],
                stroke: "red"
            });
            layer.add(line);
            line.getPoints()[0].x = mousePos.x;
            line.getPoints()[0].y = mousePos.y;
            line.getPoints()[1].x = mousePos.x;
            line.getPoints()[1].y = mousePos.y;
            moving = true;
            layer.drawScene();
        }
    });

    layer.on("mousemove", function () {
        if (moving) {
            var mousePos = stage.getMousePosition();
            var x = mousePos.x;
            var y = mousePos.y;
            line.getPoints()[1].x = mousePos.x;
            line.getPoints()[1].y = mousePos.y;
            moving = true;
            layer.drawScene();
        }
    });

    layer.on("mouseup", function () {
        moving = false;
        var mousePos = stage.getMousePosition();
        x2 = mousePos.x;
        y2 = mousePos.y;
        $("#distance").val(calculateDistance(x1, y1, x2, y2));

    });
};

私はあなたの提案をいただければ幸いです。

4

1 に答える 1

5

この関数を使用して、矢印を描くことができます。

function canvas_arrow(fromx, fromy, tox, toy){
    var headlen = 20;   // how long you want the head of the arrow to be, you could calculate this as a fraction of the distance between the points as well.
    var angle = Math.atan2(toy-fromy,tox-fromx);

    line = new Kinetic.Line({
        points: [fromx, fromy, tox, toy, tox-headlen*Math.cos(angle-Math.PI/6),toy-headlen*Math.sin(angle-Math.PI/6),tox, toy, tox-headlen*Math.cos(angle+Math.PI/6),toy-headlen*Math.sin(angle+Math.PI/6)],
        stroke: "red"
    });
}

編集：jsfiddle.net/cmcculloh/M56w4-コメントで提供

于 2013-03-26T13:49:30.767 に答える