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mockup/mockup1.html
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<html>
<head>
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Charset UTF-8
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<meta charset="UTF-8"> |
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<title>Konva's test</title> |
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Add Konva JS to t...
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<script src="https://unpkg.com/konva@3.3.2/konva.min.js"></script> |
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</head>
<body>
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<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>
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</body> </html> |