Java ImageElement.as方法代码示例

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
private void findImages() {
    mImages = new ArrayList<MarkupParser.Image>();

    NodeList<Element> allImages = mRoot.getElementsByTagName("IMG");
    for (int i = 0; i < allImages.getLength(); i++) {
        ImageElement imgElem = ImageElement.as(allImages.getItem(i));

        // As long as the image has a caption, it's relevant regardless of size;
        // otherwise, it's relevant if its size is good.
        String caption = getCaption(imgElem);
        if ((caption != null && !caption.isEmpty()) || isImageRelevantBySize(imgElem)) {
            // Add relevant image to list.
            MarkupParser.Image image = new MarkupParser.Image();
            image.url = imgElem.getSrc();
            image.caption = caption;
            image.width = imgElem.getWidth();
            image.height = imgElem.getHeight();
            mImages.add(image);
        }
    }
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
public void onModuleLoad() {
    canvas = Canvas.createIfSupported();
    if (canvas == null) {
        Window.alert("Canvas not supported");
        return;
    }
    RootPanel.get("screen").add(canvas);

    CanvasElement el = canvas.getCanvasElement();
    el.setWidth(960);
    el.setHeight(540);

    Context2d ctx = canvas.getContext2d();
    setupContext(ctx);
    ctx.scale(3, 3);

    RootPanel.get().addDomHandler(this, KeyDownEvent.getType());

    font = new Image("images/font.png");
    fontElement = ImageElement.as(font.getElement());

    audio = Audio.createIfSupported();

    game = new Game(this);
    game.pushState(new WelcomeState(game));

    new Timer() {
        @Override
        public void run() {
            game.handleEvent();
            game.update();
            game.draw();
        }
    }.scheduleRepeating(50);
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
private ImageData scaleImage(Image image, double scaleToRatio) {
    Canvas canvasTmp = Canvas.createIfSupported();
    Context2d context = canvasTmp.getContext2d();

    int imageHeight = image.getHeight();

    double ch = (imageHeight * scaleToRatio);
    int imageWidth = image.getWidth();
    
    double cw = (imageWidth * scaleToRatio);

    canvasTmp.setCoordinateSpaceHeight((int) ch);
    canvasTmp.setCoordinateSpaceWidth((int) cw);

    // TODO: make a temp imageElement?
    ImageElement imageElement = ImageElement.as(image.getElement());

    // s = source
    // d = destination
    double sx = 0;
    double sy = 0;
    int imageElementWidth = imageElement.getWidth();
    if (imageElementWidth <= 0) {
        imageElementWidth = imageWidth;
    }
    double sw = imageElementWidth;
    int imageElementHeight = imageElement.getHeight();
    if (imageElementHeight <= 0) {
        imageElementHeight = imageHeight;
    }
    double sh = imageElementHeight;

    double dx = 0;
    double dy = 0;
    double dw = imageElementWidth;
    double dh = imageElementHeight;

    // tell it to scale image
    context.scale(scaleToRatio, scaleToRatio);

    // draw image to canvas
    context.drawImage(imageElement, sx, sy, sw, sh, dx, dy, dw, dh);

    // get image data
    double w = dw * scaleToRatio;
    double h = dh * scaleToRatio;
    ImageData imageData = null;
    try {
        imageData = context.getImageData(0, 0, w, h);
    } catch (Exception e) {
        // no image data. we'll try againg...
        String b = e.getLocalizedMessage();
    }

    int ht = (int) h + 10;
    int wt = (int) w + 10;
    
    // Clear the div, clear the drawing canvas then reinsert.  Otherwise, ghosts of the previous image appear.
    canvasDiv.clear();
            
    imageCanvasContext.clearRect(0, 0, imageCanvas.getCoordinateSpaceWidth(), imageCanvas.getCoordinateSpaceHeight());
    
    canvasDiv.add(imageCanvas, 0, 0);
    canvasDiv.add(drawingCanvas, 0, 0);
    
    imageCanvas.setCoordinateSpaceHeight(ht);
    imageCanvas.setCoordinateSpaceWidth(wt);
    
    drawingCanvas.setCoordinateSpaceHeight(ht);
    drawingCanvas.setCoordinateSpaceWidth(wt);
    
    canvasDiv.setSize(wt + "px", ht + "px");

    return imageData;
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
private ImageData scaleImage(double scaleToRatio) {
	Canvas canvasTmp = Canvas.createIfSupported();
	Context2d context = canvasTmp.getContext2d();

	int imageHeight = plotImage.getHeight();
	double ch = (imageHeight * scaleToRatio);
	int imageWidth = plotImage.getWidth();
	double cw = (imageWidth * scaleToRatio);
	
	if ( imageHeight <= 0 || imageWidth <=0 ) {
	    return null;
	}

	canvasTmp.setCoordinateSpaceHeight((int) ch);
	canvasTmp.setCoordinateSpaceWidth((int) cw);

	// TODO: make a temp imageElement?
	ImageElement imageElement = ImageElement.as(plotImage.getElement());

	// s = source
	// d = destination
	double sx = 0;
	double sy = 0;
	int imageElementWidth = imageElement.getWidth();
	if (imageElementWidth <= 0) {
		imageElementWidth = imageWidth;
	}
	double sw = imageElementWidth;
	int imageElementHeight = imageElement.getHeight();
	if (imageElementHeight <= 0) {
		imageElementHeight = imageHeight;
	}
	double sh = imageElementHeight;

	double dx = 0;
	double dy = 0;
	double dw = imageElementWidth;
	double dh = imageElementHeight;

	// tell it to scale image
	context.scale(scaleToRatio, scaleToRatio);

	// draw image to canvas
	context.drawImage(imageElement, sx, sy, sw, sh, dx, dy, dw, dh);

	// get image data
	double w = dw * scaleToRatio;
	double h = dh * scaleToRatio;
	ImageData imageData = null;
	try {
		imageData = context.getImageData(0, 0, w, h);
	} catch (Exception e) {
		// Well bummer
	}
       int ht = (int) h + 10;
       int wt = (int) w + 10;
       
       // Clear the div, clear the drawing canvas then reinsert.  Otherwise, ghosts of the previous image appear.
       canvasDiv.clear();
               
       imageCanvasContext.clearRect(0, 0, imageCanvas.getCoordinateSpaceWidth(), imageCanvas.getCoordinateSpaceHeight());
       
       canvasDiv.add(imageCanvas, 0, 0);
       canvasDiv.add(drawingCanvas, 0, 0);
       
	imageCanvas.setCoordinateSpaceHeight(ht);
	imageCanvas.setCoordinateSpaceWidth(wt);
	drawingCanvas.setCoordinateSpaceHeight(ht);
	drawingCanvas.setCoordinateSpaceWidth(wt);
	canvasDiv.setSize(wt + "px", ht + "px");

	return imageData;
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
private ImageData scaleImage(double scaleToRatio) {
    Canvas canvasTmp = Canvas.createIfSupported();
    Context2d context = canvasTmp.getContext2d();

    int imageHeight = plotImage.getHeight();
    double ch = (imageHeight * scaleToRatio);
    int imageWidth = plotImage.getWidth();
    double cw = (imageWidth * scaleToRatio);

    canvasTmp.setCoordinateSpaceHeight((int) ch);
    canvasTmp.setCoordinateSpaceWidth((int) cw);

    // TODO: make a temp imageElement?
    ImageElement imageElement = ImageElement.as(plotImage.getElement());

    // s = source
    // d = destination
    double sx = 0;
    double sy = 0;
    int imageElementWidth = imageElement.getWidth();
    if (imageElementWidth <= 0) {
        imageElementWidth = imageWidth;
    }
    double sw = imageElementWidth;
    int imageElementHeight = imageElement.getHeight();
    if (imageElementHeight <= 0) {
        imageElementHeight = imageHeight;
    }
    double sh = imageElementHeight;

    double dx = 0;
    double dy = 0;
    double dw = imageElementWidth;
    double dh = imageElementHeight;

    // tell it to scale image
    context.scale(scaleToRatio, scaleToRatio);

    // draw image to canvas
    context.drawImage(imageElement, sx, sy, sw, sh, dx, dy, dw, dh);

    // get image data
    double w = dw * scaleToRatio;
    double h = dh * scaleToRatio;
    ImageData imageData = null;
    try {
        imageData = context.getImageData(0, 0, w, h);
    } catch (Exception e) {
        // well, bummer
    }

    int ht = (int) h + 10;
    int wt = (int) w + 10;
         
    // Clear the div, clear the drawing canvas then reinsert. Otherwise, ghosts of the previous image appear.
    canvasDiv.clear();
            
    imageCanvasContext.clearRect(0, 0, imageCanvas.getCoordinateSpaceWidth(), imageCanvas.getCoordinateSpaceHeight());
    
    canvasDiv.add(imageCanvas, 0, 0);
    canvasDiv.add(drawingCanvas, 0, 0);
    
    imageCanvas.setCoordinateSpaceHeight(ht);
    imageCanvas.setCoordinateSpaceWidth(wt);
    
    drawingCanvas.setCoordinateSpaceHeight(ht);
    drawingCanvas.setCoordinateSpaceWidth(wt);
    
    
    canvasDiv.setSize(wt+"px", ht+"px");
    
    return imageData;
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
private void cloneAndProcessNode() {
    Element cloned = Element.as(imgElement.cloneNode(true));
    ImageElement ie = ImageElement.as(
            DomUtil.getFirstElementByTagNameInc(cloned, "IMG"));
    if (!srcUrl.isEmpty()) {
        ie.setSrc(srcUrl);
        srcUrl = ie.getSrc();
    }
    // If computed width or height is zero, do not override them
    // to keep them visible.
    if (width > 0 && height > 0) {
        ie.setWidth(width);
        ie.setHeight(height);
    }
    DomUtil.stripImageElement(ie);

    NodeList<Element> srcs = cloned.getElementsByTagName("SOURCE");
    for (int i = 0; i < srcs.getLength(); i++) {
        Element src = srcs.getItem(i);
        for (String attr : LAZY_SRCSET_ATTRIBUTES) {
            String srcset = src.getAttribute(attr);
            if (!srcset.isEmpty()) {
                src.setAttribute("srcset", srcset);
                break;
            }
        }
    }

    DomUtil.makeAllSrcAttributesAbsolute(cloned);
    DomUtil.makeAllSrcSetAbsolute(cloned);

    clonedImg = cloned;
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
protected Image(Image source) {
	super(source);
	this.imgElement = ImageElement.as(this.getElement());

	this.setSrc(source.src);
	this.setAlt(source.alt);
	this.widthPx = source.widthPx;
	this.heightPx = source.heightPx;
	this.keepPropertions = source.keepPropertions;

	this.resetSize();
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
@Override
public WebImage extract(Element e) {
    if (!relevantTags.contains(e.getTagName())) {
        return null;
    }
    imgSrc = "";

    ImageElement ie = ImageElement.as(DomUtil.getFirstElementByTagNameInc(e, "IMG"));

    if ("FIGURE".equals(e.getTagName())) {
        Element img = DomUtil.getFirstElementByTagName(e, "PICTURE");
        if (img == null) {
            img = DomUtil.getFirstElementByTagName(e, "IMG");
        }
        if (img == null) {
            return null;
        }
        extractImageAttributes(ie);
        Element figcaption;
        Element cap = DomUtil.getFirstElementByTagName(e, "FIGCAPTION");
        if (cap != null) {
            // We look for links because some sites put non-caption
            // elements into <figcaption>. For example: image credit
            // could contain a link. So we get the whole DOM structure within
            // <figcaption> only when it contains links, otherwise we get the innerText.
            NodeList<Element> links = DomUtil.querySelectorAll(cap, "A[HREF]");
            figcaption = links.getLength() > 0 ?
                    cap : createFigcaptionElement(cap);
        } else {
            figcaption = createFigcaptionElement(e);
        }
        return new WebFigure(img, width, height, imgSrc, figcaption);
    }

    if ("SPAN".equals(e.getTagName())) {
        if (!e.getAttribute("class").contains("lazy-image-placeholder")) {
            return null;
        }
        // Image lazy loading on Wikipedia.
        ie = Document.get().createImageElement();
        imgSrc = e.getAttribute("data-src");
        width = JavaScript.parseInt(e.getAttribute("data-width"));
        height = JavaScript.parseInt(e.getAttribute("data-height"));
        ie.setAttribute("srcset", e.getAttribute("data-srcset"));
        return new WebImage(ie, width, height, imgSrc);
    }

    extractImageAttributes(ie);
    return new WebImage(e, width, height, imgSrc);
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
public ImageElementData copy(){
	ImageElement element=ImageElement.as(DOM.createImg());
	element.setSrc(imageElement.getSrc());
	ImageElementData newData=new ImageElementData(getFileName(),element,getDataUrl());
	return newData;
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
public static ImageElement asImageElement(ImageResource imageResource) {
  return ImageElement.as((new Image(imageResource.getSafeUri())).getElement());
}
 

import com.google.gwt.dom.client.ImageElement; //导入方法依赖的package包/类
/**
 * Draws the given image in the receiver at the specified coordinates.
 * 
 * @param image
 *            the image to draw
 * @param x
 *            the x coordinate of where to draw
 * @param y
 *            the y coordinate of where to draw
 * 
 * @exception IllegalArgumentException
 *                <ul>
 *                <li>ERROR_NULL_ARGUMENT - if the image is null</li>
 *                <li>ERROR_INVALID_ARGUMENT - if the image has been
 *                disposed</li>
 *                <li>ERROR_INVALID_ARGUMENT - if the given coordinates are
 *                outside the bounds of the image</li>
 * @exception SWTException
 *                <ul>
 *                <li>ERROR_GRAPHIC_DISPOSED - if the receiver has been
 *                disposed</li>
 *                </ul>
 * @exception SWTError
 *                <ul>
 *                <li>ERROR_NO_HANDLES - if no handles are available to
 *                perform the operation</li>
 *                </ul>
 */
public void drawImage(Image image, int x, int y) {
	if (image.gwtImage == null) {
		System.err.println("drawImage failed: image.gwtImage is null");
		return;
	}
	final ImageElement imageElement = ImageElement.as(image.gwtImage
			.getElement());
	imageElement.setSrc(image.gwtImage.getUrl());
	context2d.save();
	reInitContext2d();
	context2d.drawImage(imageElement, x, y);
	context2d.restore();
}