Check out my html5 based clipping constraint on
http://shedlimited.debrucellc.com/test3/canvaskinclip.html
(messing with jsfiddle on http://jsfiddle.net/aqaP7/4/)
So, in html5 I can easily draw a shaped boundary like the following:
context.beginPath();
context.moveTo(5, 5);
context.lineTo(34, 202);
context.lineTo(2, 405);
context.lineTo(212, 385);
context.lineTo(425, 405);
context.lineTo(400, 202);
context.lineTo(415, 10);
context.lineTo(212, 25);
context.clip();
In kinetic.js though, all I see for clipping options is: height, width, and x, y,
I came across the following : Mask/Clip an Image using a Polygon in KineticJS, but the inner/fill image can't be set to draggable
any help please!
In the new kineticJS versions, a lot of the work is done in the background for you.
Take a look at this tutorial:
This fiddle gets you pretty close, here's the code:
<body>
<div id="container"></div>
<script src="http://www.html5canvastutorials.com/libraries/kinetic-v4.3.0-beta2.js"></script>
<script>
function loadImages(sources, callback) {
var images = {};
var loadedImages = 0;
var numImages = 0;
// get num of sources
for(var src in sources) {
numImages++;
}
for(var src in sources) {
images[src] = new Image();
images[src].onload = function() {
if(++loadedImages >= numImages) {
callback(images);
}
};
images[src].src = sources[src];
}
}
function draw(images) {
var stage = new Kinetic.Stage({
container: 'container',
width: 600,
height: 700
});
var layer = new Kinetic.Layer();
var patternPentagon = new Kinetic.RegularPolygon({
x: 220,
y: stage.getHeight() / 4,
sides: 5,
radius: 70,
fillPatternImage: images.yoda,
fillPatternOffset: [-220, 70],
stroke: 'black',
strokeWidth: 4,
draggable: true
});
patternPentagon.on('dragmove', function() {
//this.setFillPatternImage(images.yoda);
//this.setFillPatternOffset(-100, 70);
var userPos = stage.getUserPosition();
this.setFillPatternOffset(-userPos.x,-userPos.y);
layer.draw();
this.setX(220);
this.setY(stage.getHeight() / 4);
});
layer.add(patternPentagon);
stage.add(layer);
}
var sources = {
darthVader: 'http://www.html5canvastutorials.com/demos/assets/darth-vader.jpg',
yoda: 'http://www.html5canvastutorials.com/demos/assets/yoda.jpg'
};
loadImages(sources, function(images) {
draw(images);
});
</script>
</body>
There is a more complex/accurate way of doing this without making it a background pattern, like with grouping objects together
Related
I have a 3D model placed in a map using mapbox with javascript (using this tutorial) and I'm trying to change the object's location when a button is clicked. The object isn't moving, though, and I don't really know how to fix it.
This is the function I wrote to make the location change (I can see all those console logs when I hit the button, so I know the part that isn't working is the actual location update itself):
function updateObjectLocation(id,newTransform) {
let objectLayer = map.getLayer(id);
if (typeof objectLayer === 'undefined') {
console.log('layer ' + id + ' does not exist');
} else {
console.log(objectLayer);
console.log(newTransform);
objectLayer.render = function(gl, matrix) {
var rotationX = new THREE.Matrix4().makeRotationAxis(
new THREE.Vector3(1,0,0),
newTransform.rotateX
);
var rotationY = new THREE.Matrix4().makeRotationAxis(
new THREE.Vector3(0,1,0),
newTransform.rotateY
);
var rotationZ = new THREE.Matrix4().makeRotationAxis(
new THREE.Vector3(0,0,1),
newTransform.rotateZ
);
var m = new THREE.Matrix4().fromArray(matrix);
var l = new THREE.Matrix4()
.makeTranslation(
newTransform.translateX,
newTransform.translateY,
newTransform.translateZ
)
.scale(
new THREE.Vector3(
newTransform.scale,
- newTransform.scale,
newTransform.scale
)
)
.multiply(rotationX)
.multiply(rotationY)
.multiply(rotationZ);
this.camera.projectionMatrix = m.multiply(l);
this.renderer.state.reset();
this.renderer.render(this.scene, this.camera);
this.map.triggerRepaint();
};
}
}
Welcome to Stackoverflow. The solution is much simpler, you only have to modify the transformation, no need to rewrite the render method.
Here you have a fiddle with the solution how to move a 3D model
And here the full code
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Add a 3D model</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://api.mapbox.com/mapbox-gl-js/v1.11.1/mapbox-gl.js"></script>
<link href="https://api.mapbox.com/mapbox-gl-js/v1.11.1/mapbox-gl.css" rel="stylesheet" />
<style>
body {
margin: 0;
padding: 0;
}
#map {
position: absolute;
top: 0;
bottom: 0;
width: 100%;
}
#move {
display: block;
position: relative;
margin: 0px auto;
width: 50%;
height: 40px;
padding: 10px;
border: none;
border-radius: 3px;
font-size: 12px;
text-align: center;
color: #fff;
background: #ee8a65;
}
</style>
</head>
<body>
<script src="https://unpkg.com/three#0.106.2/build/three.min.js"></script>
<script src="https://unpkg.com/three#0.106.2/examples/js/loaders/GLTFLoader.js">
</script>
<div id="map"></div>
<button id="move">Move</button>
<script>
mapboxgl.accessToken = 'pk.eyJ1IjoianNjYXN0cm8iLCJhIjoiY2s2YzB6Z25kMDVhejNrbXNpcmtjNGtpbiJ9.28ynPf1Y5Q8EyB_moOHylw';
var map = (window.map = new mapboxgl.Map({
container: 'map',
style: 'mapbox://styles/mapbox/light-v10',
zoom: 18,
center: [148.9819, -35.3981],
pitch: 60,
antialias: true // create the gl context with MSAA antialiasing, so custom layers are antialiased
}));
// parameters to ensure the model is georeferenced correctly on the map
var modelOrigin = [148.9819, -35.39847];
var modelOrigin2 = [148.9816, -35.39851];
var modelAltitude = 0;
var modelRotate = [Math.PI / 2, 0, 0];
var modelAsMercatorCoordinate = mapboxgl.MercatorCoordinate.fromLngLat(
modelOrigin,
modelAltitude
);
// transformation parameters to position, rotate and scale the 3D model onto the map
var modelTransform = {
translateX: modelAsMercatorCoordinate.x,
translateY: modelAsMercatorCoordinate.y,
translateZ: modelAsMercatorCoordinate.z,
rotateX: modelRotate[0],
rotateY: modelRotate[1],
rotateZ: modelRotate[2],
/* Since our 3D model is in real world meters, a scale transform needs to be
* applied since the CustomLayerInterface expects units in MercatorCoordinates.
*/
scale: modelAsMercatorCoordinate.meterInMercatorCoordinateUnits()
};
var THREE = window.THREE;
// configuration of the custom layer for a 3D model per the CustomLayerInterface
var customLayer = {
id: '3d-model',
type: 'custom',
renderingMode: '3d',
onAdd: function (map, gl) {
this.camera = new THREE.Camera();
this.scene = new THREE.Scene();
// create two three.js lights to illuminate the model
var directionalLight = new THREE.DirectionalLight(0xffffff);
directionalLight.position.set(0, -70, 100).normalize();
this.scene.add(directionalLight);
var directionalLight2 = new THREE.DirectionalLight(0xffffff);
directionalLight2.position.set(0, 70, 100).normalize();
this.scene.add(directionalLight2);
// use the three.js GLTF loader to add the 3D model to the three.js scene
var loader = new THREE.GLTFLoader();
loader.load(
'https://docs.mapbox.com/mapbox-gl-js/assets/34M_17/34M_17.gltf',
function (gltf) {
this.scene.add(gltf.scene);
}.bind(this)
);
this.map = map;
// use the Mapbox GL JS map canvas for three.js
this.renderer = new THREE.WebGLRenderer({
canvas: map.getCanvas(),
context: gl,
antialias: true
});
this.renderer.autoClear = false;
},
render: function (gl, matrix) {
var rotationX = new THREE.Matrix4().makeRotationAxis(
new THREE.Vector3(1, 0, 0),
modelTransform.rotateX
);
var rotationY = new THREE.Matrix4().makeRotationAxis(
new THREE.Vector3(0, 1, 0),
modelTransform.rotateY
);
var rotationZ = new THREE.Matrix4().makeRotationAxis(
new THREE.Vector3(0, 0, 1),
modelTransform.rotateZ
);
var m = new THREE.Matrix4().fromArray(matrix);
var l = new THREE.Matrix4()
.makeTranslation(
modelTransform.translateX,
modelTransform.translateY,
modelTransform.translateZ
)
.scale(
new THREE.Vector3(
modelTransform.scale,
-modelTransform.scale,
modelTransform.scale
)
)
.multiply(rotationX)
.multiply(rotationY)
.multiply(rotationZ);
this.camera.projectionMatrix = m.multiply(l);
this.renderer.state.reset();
this.renderer.render(this.scene, this.camera);
this.map.triggerRepaint();
}
};
map.on('style.load', function () {
map.addLayer(customLayer, 'waterway-label');
});
document.getElementById('move').addEventListener('click', function () {
// creating an event listener to modify the position to modelOrigin2
modelAsMercatorCoordinate = mapboxgl.MercatorCoordinate.fromLngLat(
modelOrigin2,
modelAltitude
);
// transformation parameters to position, rotate and scale the 3D model onto the map
modelTransform = {
translateX: modelAsMercatorCoordinate.x,
translateY: modelAsMercatorCoordinate.y,
translateZ: modelAsMercatorCoordinate.z,
rotateX: modelRotate[0],
rotateY: modelRotate[1],
rotateZ: modelRotate[2],
/* Since our 3D model is in real world meters, a scale transform needs to be
* applied since the CustomLayerInterface expects units in MercatorCoordinates.
*/
scale: modelAsMercatorCoordinate.meterInMercatorCoordinateUnits()
};
});
</script>
</body>
</html>
BTW, if you are trying to create a much more interactive experience between Mapbox and Three.js, but I would recommend you to check out the latest version of threebox as it enables you to add as many models and 3D layers as you want but also to do things like these below with only a few lines of code
map.on('style.load', function () {
map.addLayer({
id: 'custom_layer',
type: 'custom',
renderingMode: '3d',
onAdd: function (map, mbxContext) {
window.tb = new Threebox(
map,
mbxContext,
{ defaultLights: true }
);
var options = {
obj: '/3D/soldier/soldier.glb',
type: 'gltf',
scale: 1,
units: 'meters',
rotation: { x: 90, y: 0, z: 0 } //default rotation
}
tb.loadObj(options, function (model) {
soldier = model.setCoords(origin);
tb.add(soldier);
})
},
render: function (gl, matrix) {
tb.update();
}
});
})
- 3D models built-in and custom animations
- Full raycast support MouseOver/Mouseout, Selected, Drag&Drop, Drag&Rotate, Wireframe
- CSS2D Tooltips and Labels that consider altitude
**- Three.js and Mapbox cameras sync with depth adjustment **
- Include geolocated models of monuments
$("#NoBidsChart").get(0).toBlob(function(value) {
saveAs(value, "Summary.jpg");
});
Here i am using Chart JS(v2.5.0) for rendering charts. When i try to export the charts using Canvas to Blob converter and filesaver.js, i get the black background. So how do i get the image with customized background color(preferably white)?
If you want a customized background color then, you'd have to draw a background with your preferred color, and you can do so, like this ...
var backgroundColor = 'white';
Chart.plugins.register({
beforeDraw: function(c) {
var ctx = c.chart.ctx;
ctx.fillStyle = backgroundColor;
ctx.fillRect(0, 0, c.chart.width, c.chart.height);
}
});
DEMO
// draw background
var backgroundColor = 'white';
Chart.plugins.register({
beforeDraw: function(c) {
var ctx = c.chart.ctx;
ctx.fillStyle = backgroundColor;
ctx.fillRect(0, 0, c.chart.width, c.chart.height);
}
});
// chart
var canvas = $('#NoBidsChart').get(0);
var myChart = new Chart(canvas, {
type: 'line',
data: {
labels: [1, 2, 3, 4, 5],
datasets: [{
label: 'Line Chart',
data: [1, 2, 3, 4, 5],
backgroundColor: 'rgba(255, 0, 0, 0.2)',
borderColor: 'rgba(255, 0, 0, 0.5)',
pointBackgroundColor: 'black'
}]
}
});
// save as image
$('#save').click(function() {
canvas.toBlob(function(blob) {
saveAs(blob, "pretty image.png");
});
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/FileSaver.js/1.3.3/FileSaver.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/Chart.js/2.5.0/Chart.min.js"></script>
<button id="save">Save</button>
<canvas id="NoBidsChart"></canvas>
As I stated in my comment to the accepted answer, it bothered me that the beforeDraw event causes the fillRect code to get called multiple times. (Once per data point as far as I can see.)
But I couldn't get that approach to work when called on any other event. However, I just took the coding approach described in this answer and plugged it into code registered to run on the afterRender event and it does just what I want: run once and leave the background white.
Chart.plugins.register({
afterRender: function(c) {
console.log("afterRender called");
var ctx = c.chart.ctx;
ctx.save();
// This line is apparently essential to getting the
// fill to go behind the drawn graph, not on top of it.
// Technique is taken from:
// https://stackoverflow.com/a/50126796/165164
ctx.globalCompositeOperation = 'destination-over';
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, c.chart.width, c.chart.height);
ctx.restore();
}
});
Please visit (and up vote) the linked answer to the other posted question.
In React, with react-chartjs-2, i was able to set background color of chart like so:
const plugin = {
beforeDraw: (chartCtx) => {
const ctx = chartCtx.canvas.getContext('2d');
ctx.save();
ctx.globalCompositeOperation = 'destination-over';
ctx.fillStyle = 'white';
ctx.fillRect(0, 0, chartCtx.width, chartCtx.height);
ctx.restore();
}
};
And then add the plugin to the chart:
<Line ref={chartRef} data={chartData} options={options} plugins={[plugin]} />
Reference to the Docs
To save the chart as an image:
I created a function that uses the toBase64Image function to extract the image. I attached this function to a button to help me download chart image on click of button.
function downloadImage(){
const link = document.createElement("a");
link.download = `${chart.name || 'chart'}.jpg`
link.href = chartRef.current.toBase64Image('image/jpeg', 1);
link.click();
}
My demo is here http://jsfiddle.net/akuma/7NmXw/1/
First, draw something in the blue box.
Then, click the rotate button once.
After the box has been rotated, draw something again.
Finally the draw poisitoin was wrong.
How can I fix that, thanks!
Code:
var stage = new Kinetic.Stage({
container: 'container',
width: 500,
height: 500
});
var layer = new Kinetic.Layer({
width: 400,
height: 400
});
var rect = new Kinetic.Rect({
x: 0,
y: 0,
width: 400,
height: 300,
fill: '#00D2FF',
stroke: 'black',
strokeWidth: 5
});
layer.add(rect);
stage.add(layer);
$(document).on('click', '#rotateBtn', function () {
var w = layer.getWidth(),
h = layer.getHeight();
layer.setOffset(w / 2, h / 2);
layer.setPosition(w / 2, h / 2);
layer.rotateDeg(90);
layer.draw();
});
var points = [],
drawing = false;
stage.on('mousedown', function () {
drawing = true;
var pos = stage.getMousePosition();
points.push([pos.x, pos.y]);
var line = new Kinetic.Line({
id: 'line',
points: [
[pos.x, pos.y],
[pos.x + 1, pos.y + 1]
],
stroke: 'white',
strokeWidth: 5,
lineCap: 'round',
lineJoin: 'round'
});
layer.add(line);
layer.drawScene();
});
stage.on('mousemove', function () {
if (!drawing) {
return;
}
// Remove previous line
layer.get('#line').remove();
var pos = stage.getMousePosition();
points.push([pos.x, pos.y]);
// Redraw line
var line = new Kinetic.Line({
id: 'line',
points: points,
stroke: 'white',
strokeWidth: 5,
lineCap: 'round',
lineJoin: 'round'
});
layer.add(line);
layer.drawScene();
});
stage.on('mouseup', function () {
drawing = false;
points = [];
});
Even after rotating, Kinetic will still give you un-rotated mouse coordinates
That’s because you are asking for stage.getMousePosition and the stage is not rotated.
There is no method like layer.getMousePosition, so you’ll have to create one.
If you rotate your layer 90-degrees, you must also rotate stage's mouse coordinates by 90-degrees.
Here’s how you rotate the stage mouse position to match the layer rotation:
// get the unrotated mouse position from Kinetic
var pos=stage.getMousePosition();
// rotate that point to match the layer rotation
var x1 = rotationX
+ (pos.x-rotationX)*rotationCos
+ (pos.y-rotationY)*rotationSin;
var y1 = rotationY
+ (pos.y-rotationY)*rotationCos
- (pos.x-rotationX)*rotationSin;
Since you will be doing this math with each mousemove, you should pre-calculate the rotation values to maximize performance:
// reset the current rotation information
function setRotation(degrees){
var radians=layer.getRotation();
rotationX=layer.getOffsetX();
rotationY=layer.getOffsetY();
rotationCos=Math.cos(radians);
rotationSin=Math.sin(radians);
}
Also, a bit off-topic to your question, but...
Instead of removing / recreating a new line on every mousemove, you can “recycle” your existing line:
// set the points property of the line to your updated points array
line.setPoints(points);
Here’s code and a Fiddle: http://jsfiddle.net/m1erickson/cQATv/
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Prototype</title>
<script type="text/javascript" src="http://code.jquery.com/jquery.min.js"></script>
<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.5.min.js"></script>
<style>
#container{
border:solid 1px #ccc;
margin-top: 10px;
width:400px;
height:400px;
}
</style>
<script>
$(function(){
var stage = new Kinetic.Stage({
container: 'container',
width: 500,
height: 500
});
var layer = new Kinetic.Layer({width:400,height:400});
stage.add(layer);
// vars to save the current rotation information
var rotationX;
var rotationY;
var rotationCos;
var rotationSin;
setRotation(0);
var rect = new Kinetic.Rect({
x: 0,
y: 0,
width: 400,
height: 300,
fill: '#00D2FF',
stroke: 'black',
strokeWidth: 5
});
layer.add(rect);
stage.add(layer);
$(document).on('click', '#rotateBtn', function () {
var w = layer.getWidth(),
h = layer.getHeight();
layer.setOffset(w / 2, h / 2);
layer.setPosition(w / 2, h / 2);
layer.rotateDeg(90);
layer.draw();
// set the info necessary to un-rotate the mouse position
setRotation(layer.getRotationDeg())
});
var points = [],
drawing = false;
stage.on('mousedown', function () {
drawing = true;
// get the rotated mouse position
pos=getPos();
points.push([pos.x, pos.y]);
var line = new Kinetic.Line({
id: 'line',
points: [
[pos.x, pos.y],
[pos.x + 1, pos.y + 1]
],
stroke: 'white',
strokeWidth: 5,
lineCap: 'round',
lineJoin: 'round'
});
layer.add(line);
layer.drawScene();
});
stage.on('mousemove', function () {
if (!drawing) {
return;
}
// Remove previous line
layer.get('#line').remove();
// get the rotated mouse position
var pos = getPos();
points.push([pos.x, pos.y]);
// Redraw line
var line = new Kinetic.Line({
id: 'line',
points: points,
stroke: 'white',
strokeWidth: 5,
lineCap: 'round',
lineJoin: 'round'
});
layer.add(line);
layer.drawScene();
});
stage.on('mouseup', function () {
drawing = false;
points = [];
});
// reset to the current rotation information
function setRotation(degrees){
var radians=layer.getRotation();
rotationX=layer.getOffsetX();
rotationY=layer.getOffsetY();
rotationCos=Math.cos(radians);
rotationSin=Math.sin(radians);
}
// rotate the stage mouse position
// to match the layer rotation
function getPos(x,y){
// normal space, no adjustment necessary
if(rotationCos==0){return;}
var pos=stage.getMousePosition();
var x1 = rotationX
+ (pos.x-rotationX)*rotationCos
+ (pos.y-rotationY)*rotationSin;
var y1 = rotationY
+ (pos.y-rotationY)*rotationCos
- (pos.x-rotationX)*rotationSin;
return({x:x1,y:y1});
}
}); // end $(function(){});
</script>
</head>
<body>
<button id="rotateBtn">rotate</button>
<div id="container"></div>
</body>
</html>
I have a KineticJS shape that draws a bezier curve that is wider on one end. It draws correctly, but I can't yet detect a 'mouseover' event on it. I have created a small JSFiddle demo of the anomaly, at:
http://jsfiddle.net/VikR0001/nZYxL/6/
How can I detect 'mouseover' events on this shape?
Thanks very much in advance to all for any info!
var mainLayer;
//bezier curve code:
//http://stackoverflow.com/questions/8325680/how-to-draw-a-bezier-curve-with-variable-thickness-on-an-html-canvas
//draw a bezier curve that gets larger as it flows
//adapted for use with KineticJS
function drawBezierCurve() {
var centerLeft = new Object();
centerLeft.x = 100;
centerLeft.y = 400;
var centerRight = new Object();
centerRight.x = 400;
centerRight.y = 100;
var thicknessLeft = 1;
var thicknessRight = 50;
var color = "#000";
var context = mainLayer.getContext();
var leftUpper = {
x: centerLeft.x,
y: centerLeft.y - thicknessLeft / 2
};
var leftLower = {
x: centerLeft.x,
y: leftUpper.y + thicknessLeft
};
var rightUpper = {
x: centerRight.x,
y: centerRight.y - thicknessRight / 2
};
var rightLower = {
x: centerRight.x,
y: rightUpper.y + thicknessRight
};
var center = (centerRight.x + centerLeft.x) / 2;
var cp1Upper = {
x: center,
y: leftUpper.y
};
var cp2Upper = {
x: center,
y: rightUpper.y
};
var cp1Lower = {
x: center,
y: rightLower.y
};
var cp2Lower = {
x: center,
y: leftLower.y
};
var bezierCurve = new Kinetic.Shape({
drawFunc: function (canvas) {
var context = mainLayer.getContext();
context.fillStyle = color;
context.beginPath();
context.moveTo(leftUpper.x, leftUpper.y);
context.bezierCurveTo(cp1Upper.x, cp1Upper.y, cp2Upper.x, cp2Upper.y, rightUpper.x, rightUpper.y);
context.lineTo(rightLower.x, rightLower.y);
context.bezierCurveTo(cp1Lower.x, cp1Lower.y, cp2Lower.x, cp2Lower.y, leftLower.x, leftLower.y);
context.lineTo(leftUpper.x, leftUpper.y);
context.fill();
canvas.stroke(this);
},
fill: color,
stroke: color,
strokeWidth: 1
});
bezierCurve.on('mouseover', function (evt) {
document.body.style.cursor = "pointer";
$("#debug").html("MOUSEOVER DETECTED."); //<==NEVER CALLED
});
bezierCurve.on('mouseout', function (evt) {
document.body.style.cursor = "default";
$("#debug").html("MOUSEOUT DETECTED."); //NEVER CALLED
});
bezierCurve.setAttrs({
'leftUpper': leftUpper,
'leftLower': leftLower,
'rightUpper': rightUpper,
'rightLower': rightLower,
'cp1Upper': cp1Upper,
'cp2Upper': cp2Upper,
'cp1Lower': cp1Lower,
'cp2Lower': cp2Lower
});
mainLayer.add(bezierCurve);
mainLayer.draw();
$("#debug").html("bezier curve has been drawn onscreen.");
}
$(document).ready(function () {
var stage = new Kinetic.Stage({
container: 'canvasContainer',
width: 500,
height: 500
});
mainLayer = new Kinetic.Layer('main');
stage.add(mainLayer);
mainLayer.draw();
drawBezierCurve();
});
Can you define it as an SVG element, and just give that an onmouseover?
Fixed it! Changes are shown at the jsFiddle link in the original post.
//FIXED!
//OLD VERSION: DOES NOT WORK
// var bezierCurve = new Kinetic.Shape({
// drawFunc: function (canvas) {
// var context = mainLayer.getContext();
// context.fillStyle = color;
// context.beginPath();
// context.moveTo(leftUpper.x, leftUpper.y);
// context.bezierCurveTo(cp1Upper.x, cp1Upper.y, cp2Upper.x, cp2Upper.y, rightUpper.x, rightUpper.y);
// context.lineTo(rightLower.x, rightLower.y);
// context.bezierCurveTo(cp1Lower.x, cp1Lower.y, cp2Lower.x, cp2Lower.y, leftLower.x, leftLower.y);
// context.lineTo(leftUpper.x, leftUpper.y);
// context.closePath();
// context.fill();
// canvas.stroke(this);
// },
// fill: color,
// stroke: color,
// strokeWidth: 1
// });
//NEW VERSION: WORKS!
var bezierCurve = new Kinetic.Shape({
drawFunc: function (canvas) {
var context = canvas.getContext('2d');
context.beginPath();
context.moveTo(leftUpper.x, leftUpper.y);
context.bezierCurveTo(cp1Upper.x,cp1Upper.y, cp2Upper.x,cp2Upper.y, rightUpper.x,rightUpper.y);
context.lineTo(rightLower.x, rightLower.y);
context.bezierCurveTo(cp1Lower.x,cp1Lower.y, cp2Lower.x,cp2Lower.y, leftLower.x,leftLower.y);
context.lineTo(leftUpper.x, leftUpper.y);
context.fill();
canvas.stroke(this);
},
fill: color,
stroke: color,
strokeWidth: 3
});
I have a problem an hope to find any solution for it.
I am using Kinetic.js to create a HMI solution with special look-and-feel. Therefor I have created a function that creates 3 layers for a stage: a background layer with a grid, a layer with static shapes for the base layout of the HMI-screen and the third layer for all interactive elements (like buttons, valuedisplays and so on...). Now I want to cache the grid and the static layer to improve performance, because this layers will never change until the whole HMI-screen will change...
As a test I started to code the caching for the grid layer using the following code:
// Create a grid layer if showGrid is set to TRUE...
console.log('Start to create background grid if required');
if (this.actualPageConfig.showGrid) {
var grid = new Kinetic.Layer();
for (var x=1; x <= this.cols; x++) {
var eLoc = LCARSElements.posToRealPos(x, 1, this.cols, this.rows);
if (x <= this.actualPageConfig.columns) {
grid.add(new Kinetic.Line({
points: [eLoc.x, eLoc.y, eLoc.x, eLoc.height],
stroke: "red",
strokeWidth: 1,
lineCap: "round",
lineJoin: "round"
}));
}
}
for (var y=1; y <= this.rows; y++) {
var eLoc = LCARSElements.posToRealPos(1, y, this.cols, this.rows);
if (y <= this.actualPageConfig.rows) {
grid.add(new Kinetic.Line({
points: [eLoc.x, eLoc.y, eLoc.width, eLoc.y],
stroke: "red",
strokeWidth: 1,
lineCap: "round",
lineJoin: "round"
}));
}
}
// Add grid layer to stage
//this.stage.add(grid); <-- to be replaced by cache image
// Convert grid into an image and add this to the stage
console.log('convert grid to image to increase performance');
grid.toImage({
width: displayManager.stage.getWidth(),
height: displayManager.stage.getHeight(),
callback: function(img) {
var cacheGrid = new Kinetic.Image({
image: img,
x: 0,
y: 0,
width: displayManager.stage.getWidth(),
height: displayManager.stage.getHeight()
});
console.log('insert grid-image to stage');
displayManager.stage.add(cacheGrid);
console.log('redraw stage...');
displayManager.stage.draw();
}
});
}
My problem is, that's not working. The grid is not visible any more and the console log shows the following error information:
Type error: layer.canvas is undefined
layer.canvas.setSize(this.attrs.width, this.attrs.height); kinetic.js (Zeile 3167)
As I already figured out the error rise when the code "displayManger.stage.add(cacheGrid) will be executed (displayManager is the outside-class where this code snipped reside).
Can anyone see where I made the mistake? When I directly add the layer grid anything works fine...
I have created a jsfiddle to demonstrate the problem: jsfiddle
In fiddle you can run both versions by changing one parameter. Hope this helps....
Thanks for help.
Best regards
Thorsten
Actually, the problem is simpler than you might think - after caching the layer into an image, you're trying to add an image object directly to the stage (you can't do that).
To fix the problem, you need to create a new layer, say cahcedLayer, add the image to cachedLayer, and then add cachedLayer to the stage.
Check out the KineticJS info page to learn more about Node nesting:
https://github.com/ericdrowell/KineticJS/wiki
http://rvillani.com/testes/layer-to-image/
I've made this test and it worked. First, I draw 1000 squares to a layer, add this layer to a hidden stage then make an image from this stage using stage.toDataURL(). When the callback returns, I just create an Image from the data and a Kinetic.Image from the Image. Then I add it to a layer on my main (visible) stage.
Code (be sure to have a div called 'invisible'):
window.onload = function()
{
var stage = new Kinetic.Stage({
width: 520,
height: 480,
container: 'container'
});
var outerStage = new Kinetic.Stage({
width: stage.getWidth(),
height: stage.getHeight(),
container: 'invisible'
});
var layerToCache = new Kinetic.Layer();
var layer = new Kinetic.Layer();
var group = new Kinetic.Group({offset: [stage.getWidth(), stage.getHeight()]});
var anim = new Kinetic.Animation(function(frame){
group.rotate(0.02);
}, layer);
var fills = ['red', 'green', 'blue', 'orange', 'purple', 'cyan',
'black', 'brown', 'forestgreen', 'gray', 'pink'];
for (var i = 0; i < 10000; ++i)
{
(function ()
{
var size = Math.random() * 60 + 20;
var square = new Kinetic.Rect({
width: size,
height: size,
fill: fills[i % fills.length],
x: Math.random() * stage.getWidth() - 20,
y: Math.random() * stage.getHeight() - 20
});
layerToCache.add(square);
})();
}
var squaresImg = new Kinetic.Image();
outerStage.add(layerToCache);
outerStage.toDataURL({
callback: function (dataURL){
outerStage.clear();
var img = new Image();
img.src = dataURL;
img.onload = function () {
squaresImg.setImage(img);
squaresImg.setX(squaresImg.getWidth() >> 1);
squaresImg.setY(squaresImg.getHeight() >> 1);
group.setX(stage.getWidth() >> 1);
group.setY(stage.getHeight() >> 1);
group.add(squaresImg);
layer.add(group);
layer.draw();
anim.start();
}
}
});
var div = document.getElementById('invisible');
div.parentNode.removeChild(div);
stage.add(layer);
}