/**

  * Back 2 Browser Bytecode Translator Copyright (C) 2012 Jaroslav Tulach

  * <jaroslav.tulach@apidesign.org>

  *

  * This program is free software: you can redistribute it and/or modify it under

  * the terms of the GNU General Public License as published by the Free Software

  * Foundation, version 2 of the License.

  *

  * This program is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS

  * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more

  * details.

  *

  * You should have received a copy of the GNU General Public License along with

  * this program. Look for COPYING file in the top folder. If not, see

  * http://opensource.org/licenses/GPL-2.0.

  */

 package net.java.html.canvas;

 import net.java.html.canvas.Style.Color;

 import net.java.html.canvas.Style.LinearGradient;

 import net.java.html.canvas.Style.Pattern;

 import net.java.html.canvas.Style.RadialGradient;

 import net.java.html.canvas.spi.GraphicsEnvironment;

 import org.apidesign.html.canvas.impl.CnvsAccssr;

 /**

  * A 2D Graphics Context similar to HTML5 or JavaFX GraphicsContext. Use this to

  * paint on your Canvas

  *

  * @author antonepple

  */

 public final class GraphicsContext {

     public static void getAccssr() {

         // do nothing

     }

     GraphicsEnvironment graphicsEnvironmentImpl;

     static {

         CnvsAccssr cnvsAccssr = new CnvsAccssr() {

             @Override

             public GraphicsContext create(GraphicsEnvironment environment) {

                 return new GraphicsContext(environment);

             }

         };

     }

     GraphicsContext(GraphicsEnvironment graphicsEnvironment) {

         this.graphicsEnvironmentImpl = graphicsEnvironment;

     }

     /**

      * Adds path elements to the current path to make an arc.

      *

      * @param centerX the center x position of the arc.

      * @param centerY the center y position of the arc.

      * @param radius the radius of the arc.

      * @param endAngle teh endAngle of the arc

      * @param ccw the direction of the arc (counterclockwise)

      */

     public void arc(double centerX,

             double centerY,

             double startAngle,

             double radius,

             double endAngle,

             boolean ccw) {

         graphicsEnvironmentImpl.arc(centerX, centerY, startAngle, radius, endAngle, ccw);

     }

     /**

      * Adds segments to the current path to make an arc.

      *

      * @param x1 the X coordinate of the first point of the arc.

      * @param y1 the Y coordinate of the first point of the arc.

      * @param x2 the X coordinate of the second point of the arc.

      * @param y2 the Y coordinate of the second point of the arc.

      * @param radius the radius of the arc in the range {0.0-positive infinity}.

      */

     public void arcTo(double x1,

             double y1,

             double x2,

             double y2,

             double radius) {

         graphicsEnvironmentImpl.arcTo(x1, y1, x2, y2, radius);

     }

     /**

      * Returns true if the the given x,y point is inside the path.

      *

      * @param x the X coordinate to use for the check.

      * @param y the Y coordinate to use for the check.

      * @return true if the point given is inside the path, false otherwise.

      */

     public boolean isPointInPath(double x, double y) {

         return graphicsEnvironmentImpl.isPointInPath(x, y);

     }

     /**

      * Fills the path with the current fill paint.

      */

     public void fill() {

         graphicsEnvironmentImpl.fill();

     }

     /**

      * Strokes the path with the current stroke paint.

      */

     public void stroke() {

         graphicsEnvironmentImpl.stroke();

     }

     /**

      * Starts a Path

      */

     public void beginPath() {

         graphicsEnvironmentImpl.beginPath();

     }

     /**

      * Closes the path.

      */

     public void closePath() {

         graphicsEnvironmentImpl.closePath();

     }

     /**

      * Clips using the current path

      */

     public void clip() {

         graphicsEnvironmentImpl.clip();

     }

     /**

      * Issues a move command for the current path to the given x,y coordinate.

      *

      * @param x0 the X position for the move to command.

      * @param y0 the Y position for the move to command.

      */

     public void moveTo(double x, double y) {

         graphicsEnvironmentImpl.moveTo(x, y);

     }

     /**

      * Adds segments to the current path to make a line at the given x,y

      * coordinate.

      *

      * @param x1 the X coordinate of the ending point of the line.

      * @param y1 the Y coordinate of the ending point of the line.

      */

     public void lineTo(double x, double y) {

         graphicsEnvironmentImpl.lineTo(x, y);

     }

     /**

      * Adds segments to the current path to make a quadratic curve.

      *

      * @param cpx the X coordinate of the control point

      * @param cpy the Y coordinate of the control point

      * @param x the X coordinate of the end point

      * @param y the Y coordinate of the end point

      */

     public void quadraticCurveTo(double cpx, double cpy, double x, double y) {

         graphicsEnvironmentImpl.quadraticCurveTo(cpx, cpy, x, y);

     }

     /**

      * Adds segments to the current path to make a cubic bezier curve.

      *

      * @param cp1x the X coordinate of first bezier control point.

      * @param cp1y the Y coordinate of the first bezier control point.

      * @param cp2x the X coordinate of the second bezier control point.

      * @param cp2y the Y coordinate of the second bezier control point.

      * @param x the X coordinate of the end point.

      * @param y the Y coordinate of the end point.

      */

     public void bezierCurveTo(double cp1x, double cp1y, double cp2x, double cp2y, double x, double y) {

         graphicsEnvironmentImpl.bezierCurveTo(cp1x, cp1y, cp2x, cp2y, x, y);

     }

     /**

      * Fills a rectangle using the current fill paint.

      *

      * @param x the X position of the upper left corner of the rectangle.

      * @param y the Y position of the upper left corner of the rectangle.

      * @param w the width of the rectangle.

      * @param h the height of the rectangle.

      */

     public void fillRect(double x, double y, double width, double height) {

         graphicsEnvironmentImpl.fillRect(x, y, width, height);

     }

     /**

      * Strokes a rectangle using the current stroke paint.

      *

      * @param x the X position of the upper left corner of the rectangle.

      * @param y the Y position of the upper left corner of the rectangle.

      * @param width the width of the rectangle.

      * @param height the height of the rectangle.

      */

     public void strokeRect(double x, double y, double width, double height) {

         graphicsEnvironmentImpl.strokeRect(x, y, width, height);

     }

     /**

      * Clears a portion of the canvas with a transparent color value.

      *

      * @param x X position of the upper left corner of the rectangle.

      * @param y Y position of the upper left corner of the rectangle.

      * @param width width of the rectangle.

      * @param height height of the rectangle.

      */

     public void clearRect(double x, double y, double width, double height) {

         graphicsEnvironmentImpl.clearRect(x, y, width, height);

     }

     /**

      * Clears a portion of the canvas with a transparent color value.

      *

      * @param x X position of the upper left corner of the rectangle.

      * @param y Y position of the upper left corner of the rectangle.

      * @param width width of the rectangle.

      * @param height height of the rectangle.

      */

     public void rect(double x, double y, double width, double height) {

         graphicsEnvironmentImpl.rect(x, y, width, height);

     }

     /**

      * Saves the following attributes onto a stack.

      * <ul>

      * <li>Global Alpha</li>

      * <li>Global Blend Operation</li>

      * <li>Transform</li>

      * <li>Fill Paint</li>

      * <li>Stroke Paint</li>

      * <li>Line Width</li>

      * <li>Line Cap</li>

      * <li>Line Join</li>

      * <li>Miter Limit</li>

      * <li>Number of Clip Paths</li>

      * <li>Font</li>

      * <li>Text Align</li>

      * <li>Text Baseline</li>

      * <li>Effect</li>

      * <li>Fill Rule</li>

      * </ul>

      * This method does NOT alter the current state in any way. Also, not that

      * the current path is not saved.

      */

     public void save() {

         graphicsEnvironmentImpl.save();

     }

     /**

      * Pops the state off of the stack, setting the following attributes to

      * their value at the time when that state was pushed onto the stack. If the

      * stack is empty then nothing is changed.

      *

      * <ul>

      * <li>Global Alpha</li>

      * <li>Global Blend Operation</li>

      * <li>Transform</li>

      * <li>Fill Paint</li>

      * <li>Stroke Paint</li>

      * <li>Line Width</li>

      * <li>Line Cap</li>

      * <li>Line Join</li>

      * <li>Miter Limit</li>

      * <li>Number of Clip Paths</li>

      * <li>Font</li>

      * <li>Text Align</li>

      * <li>Text Baseline</li>

      * <li>Effect</li>

      * <li>Fill Rule</li>

      * </ul>

      */

     public void restore() {

         graphicsEnvironmentImpl.restore();

     }

     /**

      * Rotates the current transform in degrees.

      *

      * @param angle value in degrees to rotate the current transform.

      */

     public void rotate(double angle) {

         graphicsEnvironmentImpl.rotate(angle);

     }

     /**

      * Concatenates the input with the current transform.

      *

      * @param mxx - the X coordinate scaling element of the 3x4 matrix

      * @param myx - the Y coordinate shearing element of the 3x4 matrix

      * @param mxy - the X coordinate shearing element of the 3x4 matrix

      * @param myy - the Y coordinate scaling element of the 3x4 matrix

      * @param mxt - the X coordinate translation element of the 3x4 matrix

      * @param myt - the Y coordinate translation element of the 3x4 matrix

      */

     public void transform(double mxx, double myx, double mxy, double myy, double mxt, double myt) {

         graphicsEnvironmentImpl.transform(mxx, myx, mxy, myy, mxt, myt);

     }

     /**

      * Concatenates the input with the current transform.

      *

      * @param mxx - the X coordinate scaling element of the 3x4 matrix

      * @param myx - the Y coordinate shearing element of the 3x4 matrix

      * @param mxy - the X coordinate shearing element of the 3x4 matrix

      * @param myy - the Y coordinate scaling element of the 3x4 matrix

      * @param mxt - the X coordinate translation element of the 3x4 matrix

      * @param myt - the Y coordinate translation element of the 3x4 matrix

      */

     public void setTransform(double mxx, double myx, double mxy, double myy, double mxt, double myt) {

         graphicsEnvironmentImpl.setTransform(mxx, myx, mxy, myy, mxt, myt);

     }

     /**

      * Translates the current transform by x, y.

      *

      * @param x value to translate along the x axis.

      * @param y value to translate along the y axis.

      */

     public void translate(double x, double y) {

         graphicsEnvironmentImpl.translate(x, y);

     }

     /**

      * Scales the current transform by x, y.

      *

      * @param x value to scale in the x axis.

      * @param y value to scale in the y axis.

      */

     public void scale(double x, double y) {

         graphicsEnvironmentImpl.scale(x, y);

     }

     /**

      * Draws an image at the given x, y position using the width and height of

      * the given image.

      *

      * @param img the image to be drawn.

      * @param x the X coordinate on the destination for the upper left of the

      * image.

      * @param y the Y coordinate on the destination for the upper left of the

      * image.

      */

     public void drawImage(Image image, double x, double y) {

         Object nativeImage = graphicsEnvironmentImpl.drawImage(image, x, y, image.getCached());

         image.cache(nativeImage);

     }

     /**

      * Draws an image into the given destination rectangle of the canvas. The

      * Image is scaled to fit into the destination rectagnle.

      *

      * @param img the image to be drawn.

      * @param x the X coordinate on the destination for the upper left of the

      * image.

      * @param y the Y coordinate on the destination for the upper left of the

      * image.

      * @param width the width of the destination rectangle.

      * @param height the height of the destination rectangle.

      */

     public void drawImage(Image image, double x, double y, double width, double height) {

         Object nativeImage = graphicsEnvironmentImpl.drawImage(image, x, y, width, height, image.getCached());

         image.cache(nativeImage);

     }

     /**

      * Draws the current source rectangle of the given image to the given

      * destination rectangle of the Canvas.

      *

      * @param img the image to be drawn.

      * @param sx the source rectangle's X coordinate position.

      * @param sy the source rectangle's Y coordinate position.

      * @param sw the source rectangle's width.

      * @param sh the source rectangle's height.

      * @param dx the destination rectangle's X coordinate position.

      * @param dy the destination rectangle's Y coordinate position.

      * @param dw the destination rectangle's width.

      * @param dh the destination rectangle's height.

      */

     public void drawImage(Image image, double sx, double sy, double sw, double sh, double dx, double dy, double dw, double dh) {

         Object nativeImage = graphicsEnvironmentImpl.drawImage(image, sx, sy, sw, sh, dx, dy, dw, dh, image.getCached());

         image.cache(nativeImage);

     }

     /**

      * Merges two images drawing one on top of the other and returning the

      * result.

      *

      * @param a the lower Image

      * @param b the upper Image

      * @return

      */

     public Image merge(Image a, Image b) {

         if (a.getCached() == null) {

             drawImage(a, 0, 0);

         }

         if (b.getCached() == null) {

             drawImage(b, 0, 0);

         }

         Object nativeImage = graphicsEnvironmentImpl.mergeImages(a, b, a.getCached(), b.getCached());

         Image merged = Image.create("should add real path here");

         merged.cache(nativeImage);

         return merged;

     }

 //    public void setShadowColor(String color) {

 //        graphicsEnvironmentImpl.setShadowColor(color);

 //    }

 //

 //    public void setShadowBlur(double blur) {

 //        graphicsEnvironmentImpl.setShadowBlur(blur);

 //    }

 //

 //    public void setShadowOffsetX(double x) {

 //        graphicsEnvironmentImpl.setShadowOffsetX(x);

 //    }

 //

 //    public void setShadowOffsetY(double y) {

 //        graphicsEnvironmentImpl.setShadowOffsetY(y);

 //    }

 //

 //    public String getShadowColor() {

 //        return graphicsEnvironmentImpl.getShadowColor();

 //    }

 //

 //    public double getShadowBlur() {

 //        return graphicsEnvironmentImpl.getShadowBlur();

 //    }

 //

 //    public double getShadowOffsetX() {

 //        return graphicsEnvironmentImpl.getShadowOffsetX();

 //    }

 //

 //    public double getShadowOffsetY() {

 //        return graphicsEnvironmentImpl.getShadowOffsetY();

 //    }

     public String getLineCap() {

         return graphicsEnvironmentImpl.getLineCap();

     }

     public void setLineCap(String style) {

         graphicsEnvironmentImpl.setLineCap(style);

     }

     public String getLineJoin() {

         return graphicsEnvironmentImpl.getLineJoin();

     }

     public void setLineJoin(String style) {

         graphicsEnvironmentImpl.setLineJoin(style);

     }

     public double getLineWidth() {

         return graphicsEnvironmentImpl.getLineWidth();

     }

     public void setLineWidth(double width) {

         graphicsEnvironmentImpl.setLineWidth(width);

     }

     public double getMiterLimit() {

         return graphicsEnvironmentImpl.getMiterLimit();

     }

     public void setMiterLimit(double limit) {

         graphicsEnvironmentImpl.setMiterLimit(limit);

     }

     /**

      * Sets the fill style. Will be used when rendering something, e.g. calling one

      * of the fillText Methods.

      * @param style 

      */

     public void setFillStyle(Style style) {

         Object nativeFillStyle = graphicsEnvironmentImpl.setFillStyle(style, style.getCached());

         style.cache(nativeFillStyle);

     }

     /**

      * get the current font

      *

      * @return current Font. 

      * of the fillText Methods.

      */

     public String getFont() {

         return graphicsEnvironmentImpl.getFont();

     }

     /**

      * Set the Font. Will be used when rendering Text, e.g. by calling one

      * of the fillText Methods.

      *

      * @param font

      */

     public void setFont(String font) {

         graphicsEnvironmentImpl.setFont(font);

     }

     /**

      * sets the Style of the Stroke.

      *

      * @param style

      */

     public void setStrokeStyle(Style style) {

         Object nativeStrokeStyle = graphicsEnvironmentImpl.setStrokeStyle(style, style.getCached());

         style.cache(nativeStrokeStyle);

     }

     /**

      * Gets the current TextAlignment attribute

      *

      * @return TextAlignment with values of left, center, right, or justify.

      */

     public String getTextAlign() {

         return graphicsEnvironmentImpl.getTextAlign();

     }

     /**

      * Defines horizontal text alignment, relative to the text {@code x} origin.

      * <p>

      * Let horizontal bounds represent the logical width of a single line of

      * text. Where each line of text has a separate horizontal bounds.

      * <p>

      * Then TextAlignment is specified as:

      * <ul>

      * <li>left: the left edge of the horizontal bounds will be at {@code x}.

      * <li>center: the center, halfway between left and right edge, of the

      * horizontal bounds will be at {@code x}.

      * <li>right: the right edge of the horizontal bounds will be at {@code x}.

      * </ul>

      * <p>

      *

      * Note: Canvas does not support line wrapping, therefore the text alignment

      * Justify is identical to left aligned text.

      * <p>

      *

      * @param textAlign with values of left, center, right.

      */

     public void setTextAlign(String textAlign) {

         graphicsEnvironmentImpl.setTextAlign(textAlign);

     }

     /**

      * Gets the current Text Baseline attribute.

      *

      * @return baseline with values of top, center, baseline, or bottom

      */

     public String getTextBaseline() {

         return graphicsEnvironmentImpl.getTextBaseline();

     }

     /**

      * Sets the current Text Baseline attribute.

      *

      * @param baseline with values of top, center, baseline, or bottom

      */

     public void setTextBaseline(String textbaseline) {

         graphicsEnvironmentImpl.setTextBaseline(textbaseline);

     }

     /**

      * Renders the indicated String with current fill. default is black.

      *

      * @param text the text to stroke

      * @param x x coordinate of start position

      * @param y y coordinate of start position

      */

     public void fillText(String text, double x, double y) {

         graphicsEnvironmentImpl.fillText(text, x, y);

     }

     /**

      * Renders the indicated String with current fill. default is black.

      *

      * @param text the text to stroke

      * @param x x coordinate of start position

      * @param y y coordinate of start position

      * @param maxWidth maximum width of text

      */

     public void fillText(String text, double x, double y, double maxWidth) {

         graphicsEnvironmentImpl.fillText(text, x, y, maxWidth);

     }

     /**

      * Check the length of a text before writing it to the Canvas. Takes into

      * account the current Font.

      *

      * @param text the text to measure

      * @return the length in pixels

      */

     public Dimension measureText(String text) {

         return graphicsEnvironmentImpl.measureText(text);

     }

     /**

      * Renders the indicated String (with no fill)

      *

      * @param text the text to stroke

      * @param x x coordinate of start position

      * @param y y coordinate of start position

      */

     public void strokeText(String text, double x, double y) {

         graphicsEnvironmentImpl.strokeText(text, x, y);

     }

     /**

      * Renders the indicated String (with no fill)

      *

      * @param text the text to stroke

      * @param x x coordinate of start position

      * @param y y coordinate of start position

      * @param maxWidth maximum width of text

      */

     public void strokeText(String text, double x, double y, double maxWidth) {

         graphicsEnvironmentImpl.strokeText(text, x, y, maxWidth);

     }

 //    public ImageData createPixelMap(double x, double y) {

 //        return graphicsEnvironmentImpl.createPixelMap(x, y);

 //    }

 //

 //    public ImageData createPixelMap(ImageData pixelMap) {

 //        return graphicsEnvironmentImpl.createPixelMap(pixelMap);

 //    }

 //

 //    public ImageData getSnapshot(double x, double y, double width, double height) {

 //        return graphicsEnvironmentImpl.getPixelMap(x, y, width, height);

 //    }

 //

 //    public void drawPixelMap(ImageData pixelMap, double x, double y) {

 //        graphicsEnvironmentImpl.putPixelMap(pixelMap, x, y);

 //    }

 //

 //    public void drawPixelMap(ImageData pixelMap, double x, double y, double dirtyx, double dirtyy, double dirtywidth, double dirtyheight) {

 //        graphicsEnvironmentImpl.putPixelMap(pixelMap, x, y, dirtyx, dirtyy, dirtywidth, dirtyheight);

 //    }

     /**

      * Sets the global alpha of the current state.

      *

      * @param alpha value in the range {@code 0.0-1.0}. The value is clamped if

      * it is out of range.

      */

     public void setGlobalAlpha(double alpha) {

         graphicsEnvironmentImpl.setGlobalAlpha(alpha);

     }

     /**

      * Gets the current global alpha.

      *

      * @return the current global alpha.

      */

     public double getGlobalAlpha() {

         return graphicsEnvironmentImpl.getGlobalAlpha();

     }

     /**

      * Sets the global blend mode.

      *

      * @param op the BlendMode that will be set.

      */

     public void setGlobalCompositeOperation(String operation) {

         graphicsEnvironmentImpl.setGlobalCompositeOperation(operation);

     }

     /**

      * Gets the global blend mode.

      *

      * @return the global BlendMode of the current state.

      */

     public String getGlobalCompositeOperation() {

         return graphicsEnvironmentImpl.getGlobalCompositeOperation();

     }

     /**

      * Create a LinearGradient to use in Canvas.

      *

      * @param x0 x coordinate of start point

      * @param y0 y coordinate of start point

      * @param x1 x coordinate of end point

      * @param y1 y coordinate of end point

      * @return the gradient

      */

     public LinearGradient createLinearGradient(double x0, double y0, double x1, double y1) {

         return new Style.LinearGradient(x0, y0, x1, y1);

     }

     /**

      * Create an Image Pattern from a source Image and a repeat style. Possible

      * Styles are repeat, repeat-x, repeat-y, or no-repeat. defaults to repeat

      *

      * @param image the Image

      * @param repeat the repeat style

      * @return the Pattern

      */

     public Pattern createPattern(Image image, String repeat) {

         return new Pattern(image, repeat);

     }

     /**

      * Create a RadialGradient

      *

      * @param x0 x Coordinate of starting circle

      * @param y0 y Coordinate of starting circle

      * @param r0 radius of starting circle

      * @param x1 x coordinate of ending circle

      * @param y1 y coordinate of ending circle

      * @param r1 radius of ending circle

      * @return the Gradient

      */

     public RadialGradient createRadialGradient(double x0, double y0, double r0, double x1, double y1, double r1) {

         return new RadialGradient(x0, y0, r0, x1, y1, r1);

     }

     /**

      * Convert this String Representation of a Color to a Color Object.

      *

      * @param webColor

      * @return The Color represented by the input

      */

     public Color getWebColor(String webColor) {

         return new Style.Color(webColor);

     }

     /**

      * Get the height of this GraphicsContext (which should be the same as the

      * enclosing canvas height)

      *

      * @return the height of this GraphicsContext

      */

     public int getHeight() {

         return graphicsEnvironmentImpl.getHeight();

     }

     /**

      * Get the width of this GraphicsContext (which should be the same as the

      * enclosing canvas height)

      *

      * @return the width of this GraphicsContext

      */

     public int getWidth() {

         return graphicsEnvironmentImpl.getWidth();

     }

 //    public void setHeight(int height) {

 //        graphicsEnvironmentImpl.setHeight(height);

 //    }

 //

 //    public void setWidth(int width) {

 //        graphicsEnvironmentImpl.setWidth(width);

 //    }

     /**

      * Fill a circle with a center position of centerX, centerY and the

      * specified radius.

      *

      * @param centerX

      * @param centerY

      * @param radius

      */

     public void fillCircle(float centerX, float centerY, float radius) {

         graphicsEnvironmentImpl.arc(centerX, centerY, radius, 0, Math.PI * 2, false);

     }

     /**

      * Fills a polygon with the given points using the currently set fill paint.

      *

      * @param x_coord array containing the x coordinates of the polygon's

      * points.

      * @param y_coord array containing the y coordinates of the polygon's

      * points.

      * @param vertexCount the number of points that make the polygon.

      */

     public void fillPolygon(double[] x_coord, double[] y_coord, int vertexCount) {

         if (vertexCount >= 1 && x_coord != null && x_coord.length >= vertexCount && y_coord != null && y_coord.length >= vertexCount) {

             graphicsEnvironmentImpl.beginPath();

         }

         graphicsEnvironmentImpl.moveTo(x_coord[0], y_coord[0]);

         for (int i = 1; i < vertexCount; i++) {

             graphicsEnvironmentImpl.lineTo(x_coord[i], y_coord[i]);

         }

         graphicsEnvironmentImpl.closePath();

         graphicsEnvironmentImpl.fill();

         graphicsEnvironmentImpl.stroke();

     }

 }