Quillot Mathias / triangle

mockup1.html 6.54 KB
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<html>
    <head>
        <meta charset="UTF-8">
        <title>Konva's test</title>
        <script src="https://unpkg.com/konva@3.3.2/konva.min.js"></script>   
    </head>
    <body>
        <h1>Interface Mockup with Konda JS</h1>
        <div id="container"></div>

<script type="text/javascript">

// -- FUNCTIONS -- 
/**
 * Check if an intersection exists between AB and CD. 
 * Return : 
 *  - false if it has no intersection
 *  - true otherwise 
 */
function isThereIntersection(A, B, C, D) {
    a = A.x;b = A.y;c = B.x;d = B.y
    p = C.x;q = C.y;r = D.x;s = D.y
    var det, gamma, lambda;
    det = (c - a) * (s - q) - (r - p) * (d - b);
    if (det === 0) {
        return false;
    } else {
        lambda = ((s - q) * (r - a) + (p - r) * (s - b)) / det;
        gamma = ((b - d) * (r - a) + (c - a) * (s - b)) / det;
        return (0 < lambda && lambda < 1) && (0 < gamma && gamma < 1)
    }
};

/**
 * Compute intersection between two lines
 * Please, check if an intersection exists between
 * calling this function. (ref isThereIntersection)
 * 
 * Return:
 * - Intersection point between two lines
 */
function intersection(A, B, C, D) {
    a = A.x;b = A.y;c = B.x;d = B.y
    p = C.x;q = C.y;r = D.x;s = D.y

    l1_a = (B.y - A.y) / (B.x - A.x);
    l1_b = A.y - l1_a * A.x;
    l2_a = (D.y - C.y) / (D.x - C.x);
    l2_b = C.y - l2_a * C.x;

    // Compute intersection point
    x = (l2_b - l1_b) / (l1_a - l2_a)        
    y = l1_a * x + l1_b
    return {
        x: x,
        y: y 
    } 
}

/**
 * Return the index of the closest point
 * 
 */
function closestPoint(ref, points) {
    var dist = 100000;
    var closest_i = -1;
    for(var i in points) {
        cur = Math.sqrt(Math.pow(ref.x - points[i].x, 2) + Math.pow(ref.y - points[i].y, 2));
        if(cur < dist) {
            dist = cur;
            closest_i = i;
        }
    }
    return closest_i;
}
// -- DATA --
data = {
    triangle: {
        A: {
            x:170,
            y: 80
        },
        B: {
            x: 365,
            y: 125
        },
        C: {
            x: 215, 
            y: 260
        }
    }
}

// -- Help functions --
function writeMessage(message) {
    text.text(message);
    layer.draw();
}

// -- STAGE & LAYER--
var stage = new Konva.Stage({
  container: 'container',   // id of container <div>
  width: 500,
  height: 500
});

var layer = new Konva.Layer();

// -- TEXT --
var text = new Konva.Text({
    x: 10,
    y: 10,
    fontFamily: 'Calibri',
    fontSize: 24,
    text: 'Test',
    fill: 'black'
});


// -- RECTANGLE --
// TODO: Ajouter un rectangle en fond qui serve à 
// gérer l'événement de la souris.

var rect = new Konva.Rect({
    x: 0,
    y: 0,
    width: stage.attrs.width,
    height: stage.attrs.height,
    stroke: 'black',
    strokeWidth: 0
});


// -- TRIANGLE --
var triangle = new Konva.Shape({
    stroke: 'black',
    fill: '#00D2FF',
    strokeWidth: 1,
    sceneFunc: function(context) {
        context.beginPath();
        context.moveTo(data.triangle.A.x, data.triangle.A.y);
        context.lineTo(data.triangle.B.x, data.triangle.B.y);
        context.lineTo(data.triangle.C.x, data.triangle.C.y);
        context.closePath();
        context.fillStrokeShape(this);50
    }
});

bar = {
    x: (data.triangle.A.x + data.triangle.B.x + data.triangle.C.x) / 3,
    y: (data.triangle.A.y + data.triangle.B.y + data.triangle.C.y) / 3
}


triangle.on("mousemove mousedown", function(event){
    if(event.evt.buttons === 1) {
        var mousePos = stage.getPointerPosition();
        var x = mousePos.x;
        var y = mousePos.y;
        point.position({x: x, y: y});
        layer.draw();
    }
})

function eventOutTriangle(event) {
    if(event.evt.buttons === 1) {
        var mousePos = stage.getPointerPosition();
        var pointout = {
            x: mousePos.x,
            y: mousePos.y
        }
        var lines_to_test = [
            {
                A: data.triangle.A, 
                B: data.triangle.B
            },
            {
                A: data.triangle.B,
                B: data.triangle.C
            },
            {
                A: data.triangle.C,
                B: data.triangle.A
            }
        ]

        var intersections = []
        for(var ind in lines_to_test) {
            line = lines_to_test[ind];
            var inter = isThereIntersection(
                line.A, line.B,
                bar, pointout
            )
            if(inter !== false) {
                intersections.push(
                    intersection(
                        line.A, line.B,
                        bar, pointout
                    )
                );
            }
        }
        i = closestPoint(pointout, intersections);
        point.position({
            x: intersections[i].x, 
            y: intersections[i].y
        });
        layer.draw();
    }
}

rect.on("mousemove", function(event) {
    eventOutTriangle(event);
})

// -- POINT --
// create our shape
var point = new Konva.Circle({
  x: bar.x,
  y: bar.y,
  radius: 5,
  fill: 'red',
  stroke: 'black',
  strokeWidth: 1
});

point.listening(false);


// -- IMAGE REFS --
// 1rst ref
var ref1Obj = new Image();
ref1Obj.onload = function() {
    var ref1 = new Konva.Image({
        x: 50,
        y: 50,
        image: ref1Obj,
        width: 100,
        height: 100
    });

    ref1.on("mousemove", function(event) {
        eventOutTriangle(event);
    });

    layer.add(ref1);
    layer.draw();
}
ref1Obj.src="https://pixel.nymag.com/imgs/daily/vulture/2017/11/01/01-thor-ragnarok.w700.h700.jpg";

// 2nd ref
var ref2Obj = new Image();
ref2Obj.onload = function() {
    var ref2 = new Konva.Image({
        x: 150,
        y: 300,
        image: ref1Obj,
        width: 100,
        height: 100
    });

    ref2.on("mousemove", function(event) {
        eventOutTriangle(event);
    });

    layer.add(ref2);
    layer.draw();
}
ref2Obj.src="https://pixel.nymag.com/imgs/daily/vulture/2017/11/01/01-thor-ragnarok.w700.h700.jpg";


// 3rd ref
var ref3Obj = new Image();
ref3Obj.onload = function() {
    var ref3 = new Konva.Image({
        x: 390,
        y: 50,
        image: ref3Obj,
        width: 100,
        height: 100
    });

    ref3.on("mousemove", function(event) {
        eventOutTriangle(event);
    });

    layer.add(ref3);
    layer.draw();
}
ref3Obj.src="https://pixel.nymag.com/imgs/daily/vulture/2017/11/01/01-thor-ragnarok.w700.h700.jpg";


// -- ADDING
// add the shape to the layer
layer.add(rect);
layer.add(triangle);
layer.add(point);
layer.add(text);


// add the layer to the stage
stage.add(layer);


// -- DRAWING
layer.draw();
</script>

    </body>
</html>