Example usage for com.google.gwt.canvas.dom.client Context2d transform

Introduction

In this page you can find the example usage for com.google.gwt.canvas.dom.client Context2d transform.

Prototype

public final native void transform(double m11, double m12, double m21, double m22, double dx, double dy) ;

Source Link

Document

Multiplies the current transform by the given matrix.

Usage

From source file:com.sencha.gxt.chart.client.draw.engine.Canvas2d.java

License:sencha.com license

/**
 * In the Canvas2d class, this method does more or less what renderSprite does in SVG and VML - it
 * actually renders the sprite to the dom.
 * @param sprite the sprite to draw// ww w .java2  s  . c o m
 */
protected void append(Sprite sprite) {
    if (sprite.isHidden() || sprite.getOpacity() == 0) {
        return;
    }
    Context2d ctx = getContext();
    ctx.save();
    //set global stuff, fill, stroke, clip, etc

    //clip - deal with translation or normal rectangle
    if (sprite.getClipRectangle() != null) {
        PreciseRectangle clip = sprite.getClipRectangle();
        if (sprite.getScaling() != null || sprite.getTranslation() != null || sprite.getRotation() != null) {
            PathSprite transPath = new PathSprite(new RectangleSprite(clip));
            transPath = transPath.map(sprite.transformMatrix());
            appendPath(ctx, transPath);
        } else {
            ctx.beginPath();
            ctx.rect(clip.getX(), clip.getY(), clip.getWidth(), clip.getHeight());
            ctx.closePath();
        }
        ctx.clip();
    }

    if (sprite.getScaling() != null || sprite.getTranslation() != null || sprite.getRotation() != null
            || (component.isViewBox() && viewbox != null)) {
        Matrix matrix = sprite.transformMatrix();
        if (matrix != null) {
            //TODO consider replacing this transform call with three distinct calls to translate/scale/rotate if cheaper
            ctx.transform(matrix.get(0, 0), matrix.get(1, 0), matrix.get(0, 1), matrix.get(1, 1),
                    matrix.get(0, 2), matrix.get(1, 2));
        }
        if (component.isViewBox() && viewbox != null) {
            double size = Math.min(getWidth() / viewbox.getWidth(), getHeight() / viewbox.getHeight());

            ctx.scale(size, size);
            ctx.translate(-viewbox.getX(), -viewbox.getY());
        }
    }

    //TODO see about caching colors via the dirty flag? If we don't use a color/gradient for a pass or three, dump it
    double opacity = Double.isNaN(sprite.getOpacity()) ? 1.0 : sprite.getOpacity();
    PreciseRectangle untransformedBbox = sprite.getPathSprite().dimensions();
    if (sprite.getStroke() != null && sprite.getStroke() != Color.NONE && sprite.getStrokeWidth() != 0) {
        ctx.setLineWidth(Double.isNaN(sprite.getStrokeWidth()) ? 1.0 : sprite.getStrokeWidth());
        ctx.setStrokeStyle(getColor(sprite.getStroke(), untransformedBbox));//TODO read bbox from cache
    }
    if (sprite.getFill() != null && sprite.getFill() != Color.NONE) {
        ctx.setFillStyle(getColor(sprite.getFill(), untransformedBbox));//TODO read bbox from cache
    }

    if (sprite instanceof PathSprite) {
        appendPath(ctx, (PathSprite) sprite);
    } else if (sprite instanceof TextSprite) {
        TextSprite text = (TextSprite) sprite;
        //TODO style and weight
        ctx.setFont(text.getFontSize() + "px " + text.getFont());
        ctx.setTextAlign(getTextAlign(text.getTextAnchor()));
        ctx.setTextBaseline(getTextBaseline(text.getTextBaseline()));
        ctx.fillText(text.getText(), text.getX(), text.getY());
    } else if (sprite instanceof RectangleSprite) {
        RectangleSprite rect = (RectangleSprite) sprite;
        if (Double.isNaN(rect.getRadius()) || rect.getRadius() == 0) {
            if (sprite.getFill() != null && sprite.getFill() != Color.NONE) {
                ctx.setGlobalAlpha(
                        Double.isNaN(sprite.getFillOpacity()) ? opacity : opacity * sprite.getFillOpacity());
                ctx.fillRect(rect.getX(), rect.getY(), rect.getWidth(), rect.getHeight());
            }
            if (sprite.getStroke() != null && sprite.getStroke() != Color.NONE
                    && sprite.getStrokeWidth() != 0) {
                ctx.setGlobalAlpha(Double.isNaN(sprite.getStrokeOpacity()) ? opacity
                        : opacity * sprite.getStrokeOpacity());
                ctx.strokeRect(rect.getX(), rect.getY(), rect.getWidth(), rect.getHeight());
            }
        } else {
            appendPath(ctx, rect.getPathSprite());
        }
    } else if (sprite instanceof CircleSprite) {
        CircleSprite circle = (CircleSprite) sprite;
        ctx.beginPath();
        ctx.arc(circle.getCenterX(), circle.getCenterY(), circle.getRadius(), 0, 2 * Math.PI);
        ctx.closePath();
        if (sprite.getFill() != null && sprite.getFill() != Color.NONE) {
            ctx.setGlobalAlpha(
                    Double.isNaN(sprite.getFillOpacity()) ? opacity : opacity * sprite.getFillOpacity());
            ctx.fill();
        }
        if (sprite.getStroke() != null && sprite.getStroke() != Color.NONE && sprite.getStrokeWidth() != 0) {
            ctx.setGlobalAlpha(
                    Double.isNaN(sprite.getStrokeOpacity()) ? opacity : opacity * sprite.getStrokeOpacity());
            ctx.stroke();
        }
    } else if (sprite instanceof EllipseSprite) {
        appendPath(ctx, sprite.getPathSprite());
    } else if (sprite instanceof ImageSprite) {
        ImageSprite image = (ImageSprite) sprite;
        ImageElement elt = Document.get().createImageElement();
        elt.setSrc(image.getResource().getSafeUri().asString());
        ctx.drawImage(elt, image.getX(), image.getY(), image.getWidth(), image.getHeight());
    }

    ctx.restore();

    if (!REDRAW_ALL) {
        renderedBbox.put(sprite, getBBox(sprite));
    }

    sprite.clearDirtyFlags();
}

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From source file:playn.flash.FlashImmediateLayerCanvas.java

License:Apache License

void transform(Context2d ctx) {
    ctx.translate(originX, originY);/*from w  w w .  ja  va2 s  .co m*/
    ctx.transform(transform.m00(), transform.m01(), transform.m10(), transform.m11(), transform.tx() - originX,
            transform.ty() - originY);
    ctx.translate(-originX, -originY);
}

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