pulpcore.image
Class CoreGraphics

java.lang.Object
  pulpcore.image.CoreGraphics

public class CoreGraphics
extends Object

Graphics rendering routines onto a CoreImage surface.

The default blend mode is BlendMode.SrcOver().

The clip is in view-space - not affected by the Transform.

Field Summary

static int	INTERPOLATION_BILINEAR Bilinear interpolation method (used for image scaling).
static int	INTERPOLATION_NEAREST_NEIGHBOR Nearest neighbor interpolation method (used for image scaling).

Method Summary

void	clear() Fills the area defined by the clip with the background color of the current drawing surface.
void	clearTransform() Sets the current transform to the identiy matrix.
void	clipRect(int x, int y, int w, int h) The clip is not affected by the transform.
void	clipRect(Rect r) The clip is not affected by the transform.
void	drawChar(char ch, int maxWidth) Internal method used to clip the TextField.
void	drawImage(CoreImage image)
void	drawImage(CoreImage image, int x, int y) Draws an image at a specific location.
void	drawImage(CoreImage image, int srcX, int srcY, int srcWidth, int srcHeight)
void	drawImage(CoreImage image, int x, int y, int srcX, int srcY, int srcWidth, int srcHeight)
void	drawLine(double x1, double y1, double x2, double y2) Draws a line using the current color.
void	drawLine(int x1, int y1, int x2, int y2) Draws a line using the current color.
void	drawLineFixedPoint(int x1, int y1, int x2, int y2) Draws a line (at fixed-point coordinates) using the current color.
void	drawRect(int x, int y, int w, int h) Draws a rectangle using the current color.
void	drawRotatedImage(CoreImage image, int x, int y, int w, int h, int angle) Draws a rotated and scaled image.
void	drawRotatedImage(CoreImage image, int x, int y, int w, int h, int cosAngle, int sinAngle) Draws a rotated and scaled image using pre-computed cosine and sine of the angle.
void	drawRotatedImage(CoreImage image, int x, int y, int w, int h, int angle, int srcX, int srcY, int srcWidth, int srcHeight) Draws a rotated and scaled image.
void	drawRotatedImage(CoreImage image, int x, int y, int w, int h, int cosAngle, int sinAngle, int srcX, int srcY, int srcWidth, int srcHeight) Draws a rotated and scaled image using pre-computed cosine and sine of the angle.
void	drawRotatedString(String str, int x, int y, int w, int h, int angle)
void	drawRotatedString(String str, int x, int y, int w, int h, int cosAngle, int sinAngle)
void	drawScaledImage(CoreImage image, int x, int y, int w, int h)
void	drawScaledImage(CoreImage image, int x, int y, int w, int h, int srcX, int srcY, int srcWidth, int srcHeight)
void	drawScaledString(String str, int x, int y, int w, int h)
void	drawString(String str)
void	drawString(String str, int x, int y)
void	fill() Fills the entire surface with the current color.
void	fillRect(double x, double y, double w, double h) Fills a rectangle with the current color.
void	fillRect(int x, int y, int w, int h) Fills a rectangle with the current color.
void	fillRectFixedPoint(int fx, int fy, int fw, int fh) Fills a rectangle (at fixed-point coordinates) with the current color.
int	getAlpha()
BlendMode	getBlendMode()
Rect	getClip() Gets the current clip as a newly allocated Rect.
void	getClip(Rect rect) Copies the current clip into the specified Rect.
int	getClipHeight()
int	getClipWidth()
int	getClipX()
int	getClipY()
int	getColor() Returns the current color in ARGB format.
CoreFont	getFont()
boolean	getFractionalMetrics()
int	getInterpolation()
int	getSurfaceHeight()
int	getSurfaceWidth()
Transform	getTransform() Returns the current transform.
void	popTransform() Removes (pops) the transform at the top of the transform stack and sets the current transform to that popped transform.
void	pushTransform() Adds (pushes) a copy of the current transform to the top of the transform stack.
void	removeClip()
void	reset() Resets the rendering attributes for this CoreGraphics object to the default values: No clip Identity transform (and the transform stack is cleared) color = BLACK alpha = 255 blendMode = BlendMode.SrcOver() interpolation = INTERPOLATION_BILINEAR font = null
void	setAlpha(int alpha)
void	setBlendMode(BlendMode blendMode)
void	setClip(int x, int y, int w, int h) The clip is not affected by the transform.
void	setClip(Rect r) The clip is not affected by the transform.
void	setColor(int argbColor) Sets the current color.
void	setFont(CoreFont font)
void	setFractionalMetrics(boolean useFractionalMetrics)
void	setInterpolation(int interpolation)
void	setTransform(Transform newTransform) Sets the current transform to a copy of the specified transform.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

INTERPOLATION_NEAREST_NEIGHBOR

public static final int INTERPOLATION_NEAREST_NEIGHBOR

Nearest neighbor interpolation method (used for image scaling). Also known as "pixel scaling".

See Also:

Constant Field Values

INTERPOLATION_BILINEAR

public static final int INTERPOLATION_BILINEAR

Bilinear interpolation method (used for image scaling).

See Also:

Constant Field Values

Method Detail

getSurfaceWidth

public int getSurfaceWidth()

getSurfaceHeight

public int getSurfaceHeight()

reset

public void reset()

Resets the rendering attributes for this CoreGraphics object to the default values:

• No clip
• Identity transform (and the transform stack is cleared)
• color = BLACK
• alpha = 255
• blendMode = BlendMode.SrcOver()
• interpolation = INTERPOLATION_BILINEAR
• font = null

setBlendMode

public void setBlendMode(BlendMode blendMode)

getBlendMode

public BlendMode getBlendMode()

setInterpolation

public void setInterpolation(int interpolation)

getInterpolation

public int getInterpolation()

setFractionalMetrics

public void setFractionalMetrics(boolean useFractionalMetrics)

getFractionalMetrics

public boolean getFractionalMetrics()

setFont

public void setFont(CoreFont font)

getFont

public CoreFont getFont()

pushTransform

public void pushTransform()

Adds (pushes) a copy of the current transform to the top of the transform stack.

popTransform

public void popTransform()
                  throws EmptyStackException

Removes (pops) the transform at the top of the transform stack and sets the current transform to that popped transform.

Throws:

EmptyStackException - if the stack is empty

getTransform

public Transform getTransform()

Returns the current transform. The returned instance will always be the current transform of this graphics context.

setTransform

public void setTransform(Transform newTransform)

Sets the current transform to a copy of the specified transform. If the specified transform is null, the current transform is cleared, i.e., set to the identity matrix.

clearTransform

public void clearTransform()

Sets the current transform to the identiy matrix.

removeClip

public void removeClip()

setClip

public void setClip(Rect r)

The clip is not affected by the transform.

setClip

public void setClip(int x,
                    int y,
                    int w,
                    int h)

The clip is not affected by the transform.

clipRect

public void clipRect(Rect r)

The clip is not affected by the transform.

clipRect

public void clipRect(int x,
                     int y,
                     int w,
                     int h)

The clip is not affected by the transform.

getClipX

public int getClipX()

getClipY

public int getClipY()

getClipWidth

public int getClipWidth()

getClipHeight

public int getClipHeight()

getClip

public Rect getClip()

Gets the current clip as a newly allocated Rect.

getClip

public void getClip(Rect rect)

Copies the current clip into the specified Rect.

setAlpha

public void setAlpha(int alpha)

getAlpha

public int getAlpha()

setColor

public void setColor(int argbColor)

Sets the current color. The color is used for drawing rectangles and lines.

See Also:

Colors

getColor

public int getColor()

Returns the current color in ARGB format.

See Also:

Colors

drawLine

public void drawLine(int x1,
                     int y1,
                     int x2,
                     int y2)

Draws a line using the current color.

drawLine

public void drawLine(double x1,
                     double y1,
                     double x2,
                     double y2)

Draws a line using the current color.

drawLineFixedPoint

public void drawLineFixedPoint(int x1,
                               int y1,
                               int x2,
                               int y2)

Draws a line (at fixed-point coordinates) using the current color.

drawRect

public void drawRect(int x,
                     int y,
                     int w,
                     int h)

Draws a rectangle using the current color. This method draws rectangles at integer coordinates.

Note, this method is different from java.awt.Graphics.drawRect() which draws a rectangle with a width of (w+1) and a height of (h+1).

fill

public void fill()

Fills the entire surface with the current color. Same as calling fillRect(0, 0, surfaceWidth, surfaceHeight) with the identity transform.

clear

public void clear()

Fills the area defined by the clip with the background color of the current drawing surface. For opaque surfaces, the background color is black. For surfaces with alpha, the background color is transparent. The current blend mode is ignored - the area if filled using the Porter-Duff Source rule.

fillRect

public void fillRect(int x,
                     int y,
                     int w,
                     int h)

Fills a rectangle with the current color.

fillRect

public void fillRect(double x,
                     double y,
                     double w,
                     double h)

Fills a rectangle with the current color.

fillRectFixedPoint

public void fillRectFixedPoint(int fx,
                               int fy,
                               int fw,
                               int fh)

Fills a rectangle (at fixed-point coordinates) with the current color.

drawString

public void drawString(String str)

drawChar

public void drawChar(char ch,
                     int maxWidth)

Internal method used to clip the TextField. The problem is the clip is limited to View Space, but the TextField needs clipping to occur in Local Space. This method can be removed if, in future versions, CoreGraphics objects can be clipped in Local Space.

drawString

public void drawString(String str,
                       int x,
                       int y)

drawScaledString

public void drawScaledString(String str,
                             int x,
                             int y,
                             int w,
                             int h)

drawRotatedString

public void drawRotatedString(String str,
                              int x,
                              int y,
                              int w,
                              int h,
                              int angle)

drawRotatedString

public void drawRotatedString(String str,
                              int x,
                              int y,
                              int w,
                              int h,
                              int cosAngle,
                              int sinAngle)

drawImage

public void drawImage(CoreImage image)

drawImage

public void drawImage(CoreImage image,
                      int srcX,
                      int srcY,
                      int srcWidth,
                      int srcHeight)

drawImage

public void drawImage(CoreImage image,
                      int x,
                      int y)

Draws an image at a specific location. The image is drawn using the current clip, transform, alpha value, and blend mode. If the image is null, no action is taken and no exception is thrown.

Parameters:

image - the image to draw.

x - the x coordinate.

y - the y coordinate.

drawImage

public void drawImage(CoreImage image,
                      int x,
                      int y,
                      int srcX,
                      int srcY,
                      int srcWidth,
                      int srcHeight)

drawScaledImage

public void drawScaledImage(CoreImage image,
                            int x,
                            int y,
                            int w,
                            int h)

drawScaledImage

public void drawScaledImage(CoreImage image,
                            int x,
                            int y,
                            int w,
                            int h,
                            int srcX,
                            int srcY,
                            int srcWidth,
                            int srcHeight)

drawRotatedImage

public void drawRotatedImage(CoreImage image,
                             int x,
                             int y,
                             int w,
                             int h,
                             int angle)

Draws a rotated and scaled image. The image is rotated around it's center.

Parameters:

angle - a fixed-point angle, typically in the range from 0 to 2 * CoreMath.PI.

drawRotatedImage

public void drawRotatedImage(CoreImage image,
                             int x,
                             int y,
                             int w,
                             int h,
                             int angle,
                             int srcX,
                             int srcY,
                             int srcWidth,
                             int srcHeight)

Draws a rotated and scaled image. The image is rotated around it's center.

Parameters:

angle - a fixed-point angle, typically in the range from 0 to 2 * CoreMath.PI.

drawRotatedImage

public void drawRotatedImage(CoreImage image,
                             int x,
                             int y,
                             int w,
                             int h,
                             int cosAngle,
                             int sinAngle)

Draws a rotated and scaled image using pre-computed cosine and sine of the angle. The image is rotated around it's center.

Parameters:

cosAngle - The fixed-point cosine of the angle.

sinAngle - The fixed-point sine of the angle.

drawRotatedImage

public void drawRotatedImage(CoreImage image,
                             int x,
                             int y,
                             int w,
                             int h,
                             int cosAngle,
                             int sinAngle,
                             int srcX,
                             int srcY,
                             int srcWidth,
                             int srcHeight)

Draws a rotated and scaled image using pre-computed cosine and sine of the angle. The image is rotated around it's center.

Parameters:

cosAngle - The fixed-point cosine of the angle.

sinAngle - The fixed-point sine of the angle.