I'm building chart in Action Script 3.0 and need to set background color of the area where chart is drawn. I found solutions how to set background color for all chart, but it's not exactly what I need: I need to color chart part where plot is drawn
in your chart you need to add a background element with a CartesianDataCanvas. Then in the AS you can add elements to that chartBackground. For Example
<mx:LineChart id="chart">
<mx:backgroundElement>
<mx:CartesianDataCanvas id="chartBackground" includeInRanges="true"/>
</mx:bakgroundElement>
</mx:LineChart>
...
private function addToBackground_():void
{
var box:Canvas = new Canvas();
box.setStyle("backgroundColor", "green");
box.setStyle("backgroundAlpha", 0.5);
box.width = 100;
box.height = 100;
chartBackground.addDataChild(box, new CartesianCanvasValue(chart.horizontalAxis.minimum, 0),
CartesianCanvasValue(chart.verticalAxixs.maximum, 0));
}
This will add a transparent green square at the top left corner of the plot
Related
In SkiaSharp I can nicely fill the space between two curves by using SKPathFillType.EvenOdd. Below I show a simplified excerpt from the code.
My question is how can I give a certain pattern to this filled area between the curves ? Here I can only fill it with a color and give it a transparency. I'm interested in applying a pattern, such as hatch or dots.
Thank you for any support.
Greetings,
Sorin
SKPath path = new SKPath();
path.FillType = SKPathFillType.EvenOdd;
// start the first curve
path.MoveTo(....);
path.LineTo(....); // draw the curve and close it
....
path.AddCircle(....); // add a second curve as a circle
SKPaint paint = new SKPaint(new SKFont(SKTypeface.Default)) {
IsAntialias = true,
Style = SKPaintStyle.Fill,
Color = SKColors.Blue.WithAlpha((byte)(0xFF * (1 - 0.5))),
StrokeWidth = 1
};
canvas.DrawPath(path, paint);
I've managed to fix this with a trick.
First of all, I do all I wrote above, i.e.
canvas.DrawPath(path, paint)
.... will draw a filled area between the two curves, with a certain transparency.
On top of that (literally), I draw another pattern:
var hatch = new SKPath();
hatch.AddCircle(0, 0, 1);
var hatchPaint = new SKPaint {
PathEffect = SKPathEffect.Create2DPath(SKMatrix.MakeScale(7, 7), hatch),
Color = SKColors.RosyBrown,
Style = SKPaintStyle.Stroke,
StrokeWidth = 3
};
And again:
canvas.DrawPath(path, hatchPaint);
This draws a nice hatch pattern on top of the filled area between the curves.
Note: the size of the pattern is essential - here AddCircle(0, 0, 1), where the circle ray is 1 pixel. If you have a larger one, the hatch pattern will spill out the filled area, which is not what you want. To me this looks like a bug in SKIA.
Im try to drew custom shape, but since I use moveTo ..I cant be filled it, so That my question is there's any way can may be determined points on screen to fill shape? or to do that I most use or drew another real shape in the same block as layer ...
Look at my example here to drew a simple shape:
to I can fill image with blue color Im drew a Fill rectangle, so That is is a true way?
Code for shape for before fill:
var canvas3 = document.getElementById('canvas3');
var c3 = canvas3.getContext('2d');
c3.fillStyle = 'green';
c3.beginPath();
c3.moveTo(10,30);
c3.lineTo(200,30);
c3.moveTo(10,80);
c3.lineTo(200,80);
c3.moveTo(10,30);
c3.lineTo(10,180);
c3.moveTo(200,30);
c3.lineTo(200,180);
//c3.closePath();
c3.fill();
c3.lineWidth = 5;
c3.strokeStyle = 'orange';
c3.stroke();
Code for shape after fill:
var canvas3 = document.getElementById('canvas3');
var c3 = canvas3.getContext('2d');
c3.fillStyle = 'blue';
c3.beginPath();
c3.moveTo(10,30);
c3.fillRect(10,30,190,60);
c3.moveTo(10,30);
c3.lineTo(10,180);
c3.moveTo(10,90);
c3.lineTo(200,90);
c3.moveTo(200,30);
c3.lineTo(200,180);
c3.moveTo(10,30);
c3.lineTo(200,30);
//c3.closePath();
c3.fill();
c3.lineWidth = 5;
c3.strokeStyle = 'orange';
c3.stroke();
and finally which is a best way to I can drew shapes like this?
Note: Im new on html5 canvas and I read from this online book.
is there any way can may be determined points on screen to fill
shape? or to do that I most use or drew another real shape in the same
block as layer
Just draw a shape in the same place. Fill first then stroke afterwards. A little planning may be required with canvas as to in which order to draw things.
You can define objects to hold the geometrical data if you plan to redraw often or move them around. This will certainly simplify the objective later on.
which is a best way to I can drew shapes like this?
In my opinion this code can be drawn much simpler and in fewer lines of codes. There is no need to break up a shape in several parts as in that code if you can draw a shape using a simple method for it. In this case four lines can be replaced with one rectangle.
Knowing how these shapes are drawn internally also helps so we can take advantage of the path a rect() leaves, i.e. closing in upper-left corner so we can continue from there.
For example:
var c3 = c.getContext("2d");
// fill blue box first as it will be at the bottom
c3.rect(10, 30, 190, 50); // x, y, width, height
c3.fillStyle = 'blue';
c3.fill();
// orange stroke
// we know rect() will close at upper-left corner so continue from there with left leg
c3.lineTo(10, 180);
c3.moveTo(200, 80); // create second leg at right separately
c3.lineTo(200, 180);
c3.strokeStyle = "orange";
c3.lineWidth = 5;
c3.lineJoin = c3.lineCap = "round";
c3.stroke();
<canvas id=c height=180></canvas>
An alternative approach would be to fill then build the line path:
var c3 = c.getContext("2d");
c3.fillStyle = 'blue';
c3.fillRect(10, 30, 190, 50); // fillRect does not add to path
// orange stroke
c3.moveTo(10, 180); // create "housing" starting at bottom-left corner
c3.lineTo(10, 30); // upper-left
c3.lineTo(200, 30); // upper-right
c3.lineTo(200, 180); // bottom-right
c3.moveTo(10, 80); // add cross-bar
c3.lineTo(200, 80);
c3.strokeStyle = "orange";
c3.lineWidth = 5;
c3.lineJoin = c3.lineCap = "round";
c3.stroke();
<canvas id=c height=180></canvas>
I used to create a gradient mask in Flash using these three lines of AS3 while having two movieclips on the stage, one of which had a gradient block in it:
gradientMask_mc.cacheAsBitmap = true;
something_mc.cacheAsBitmap = true;
something_mc.mask = gradientMask_mc;
Now that I'm experimenting with Flash CC's HTML5 Canvas, I can't seem to find the equivalent. Is it an entirely different setup or what? My searches yield only the AS3 solutions. Please and thanks!
In pure HTML5 canvas and javascript to blend two images with a gradient.
// img1, img2 are the two images
// ctx is the canvas.
// setup. Only do this once or when you change the masking
// create a mask canvas the size of the first image
var gradImg1Masked = document.createElement("canvas");
gradImg1Masked.width = img1.width; // set the width and height
gradImg1Masked.height = img1.height;
var ctx1 = gradImg1Masked.getContext("2d",{ alpha: true }); // get the context
var gradient = ctx1.createLinearGradient(0, 0, 0, img1.height); // create a gradient
// assuming its from
// top to bottom.
// add colour stops black full opaque at top to full transparent at bottom
gradient.addColorStop( 0, "rgba(0,0,0,1)" );
gradient.addColorStop( 1, "rgba(0,0,0,0)" );
ctx1.globalAlpha = 1; // ensure alpha is on full
ctx1.globalCompositeOperation = "source-over"; // ensure correct filter
ctx1.drawImage(img1, 0, 0); // draw the image on the mask canvas
ctx1.fillStyle = gradient; // set the fill style
ctx1.globalCompositeOperation = "destination-in"; // set filter to mask letting
// only opaque pixels in
ctx1.fillRect(0, 0, img1.width, img1.height); // create the masked image
// by rendering the gradiant ontop
// gradImg1Masked is now the masked copy of img1
That was the setup. Below is the rendering.
// Rendering the images with the mask
// simply draw the second image and the the first on top
// ctx is the render surface you are displaying
// x and y are where you want the top left of the images to be.
ctx.globalAlpha = 1; // ensure alpha is on full
ctx.globalCompositeOperation = "source-over"; // ensure correct filter
// draw the second image at x,y screen pos
ctx.drawImage(img2,0,0,img2.width,img2.height,x,y,img2.width,img2.height);
// draw the masked image ontop using the second image's size
ctx.drawImage( gradImg1Masked,
0, 0, gradImg1Masked.width, gradImg1Masked.height,
x, y, img2.width, img2.height);
Hope this helps. There may be an easier way Flash CC's HTML5 Canvas but I find frameworks provide little benefit over the very functional HTML5/Javascript while obfuscating what is happening and also slowing everything down. Their use is of course a personal decision.
How to draw shadow only in right and bottom side of object in createjs. there is no shadow over the object or on top and left side.
the shadow contains only 4 parameters
1. color of shadow
2. x
3. y
4. blur effect
but it didn't tell anything about 4 different sides.
var box = createjs.Shape();
box.shadow = new createjs.shadow('#000',4,4,5);
the above code generates some blur portion over top and left part of object.
Your example is working for me, I've tested on fiddle.net using firefox and chrome.
http://jsfiddle.net/by1vf7oc/
var box = new createjs.Shape();
box.graphics.beginFill("red").drawRect(100, 100, 100, 100);
box.shadow = new createjs.Shadow('#000', 4, 4, 5);
Try to test on these browsers, using the last version of the createjs.
Try this:
var box = new createjs.Shape();
box.graphics.beginFill("red").drawRect(0, 0, 100, 100);
box.shadow = new createjs.Shadow("#000000", 10, 10, 0);
this is giving dark black color with outline of shadow box over object. i need blurred shadow on right and bottom with no effect on object.
I have to move some pictures in my flash. So I have got a background image in my main MovieClip(which I get by Loader class). Inside the image I have rectangles. I'm going to put small image in this rectangle and move it. I need the small image slowly disappear while crossing the rectangle boundaries.
I tried to put another movieclip in rectangles and moved image in this movieclip. But while crossing the rectangle the image didnt disappear. The image just continued its motion without disappearing.
How can I make dissapearing of image while crossing rectangle boundaries?
Sorry for my English.
Get TweenLite. It's an animation "tweening" library that makes animation a breeze. There are others, but this is the one I use.
It depends on the methodology you employ to move and detect your overlaps of image & rectangles.
Let's imagine you have two squares (red square, and blue square) and you want red square to fade-out whenever it overlaps blue square. Is this controlled with the mouse, keyboard, or a pre-calculated move that performs a guaranteed eclipse? Is the fade a factor of the percentage of overlap, or a straight-up 0-to-100 timed transition the moment it comes in contact with blue square? It's not clear from the description you gave as to what exactly you expect your code to do. Please review SO's "Asking" section, to help improve the quality of your question so that you get the right answer you're looking for.
That said, here's one way you could resolve the issue:
import com.greensock.*;
// Create some sample red & blue squares
var red:Sprite = new Sprite();
red.graphics.beginFill(0xFF0000, 1);
red.graphics.drawRect(0, 0, 100, 100);
red.graphics.endFill();
addChild(red);
stage.addEventListener(MouseEvent.MOUSE_MOVE, updateRed);
var blue:Sprite = new Sprite();
blue.graphics.beginFill(0x0000FF, 1);
blue.graphics.drawRect(0, 0, 100, 100);
blue.graphics.endFill();
addChild(blue);
blue.x = 200;
blue.y = 100;
var overlap:Boolean = false; // global state tracker
function updateRed(e:MouseEvent):void {
// Position the red square every time the mouse moves
red.x = stage.mouseX - red.width/2; // center relative to red square's dimensions
red.y = stage.mouseY - red.height/2;
if (red.hitTestObject(blue) && overlap != true) {
// Make sure we only animate on the initial overlap
overlap = true;
TweenLite.to(red, 1, {alpha:0});
} else if (red.hitTestObject(blue) == false && overlap) {
// And converserly, on the initial exit
overlap = false;
TweenLite.to(red, 1, {alpha:1});
}
}