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/***************************************************************************
*
* $Id: adraw.h 161 2010-10-26 20:17:16Z Michael.McTernan $
*
* This file is part of mscgen, a message sequence chart renderer.
* Copyright (C) 2005 Michael C McTernan, Michael.McTernan.2001@cs.bris.ac.uk
*
* 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; either version 2 of the License, or
* (at your option) any later version.
*
* 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; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
**************************************************************************/
#ifndef MSCGEN_ADRAW_H
#define MSCGEN_ADRAW_H
#include "mscgen_bool.h"
/***************************************************************************
* Types
***************************************************************************/
/** Output format types.
* Enumerated types for output formats.
*/
typedef enum
{
/** Null output format.
* This allows all the graphics commands to be called, but does nothing.
*/
ADRAW_FMT_NULL = 0,
/** Generate a PNG. */
ADRAW_FMT_PNG,
/** Generate Encapsulated Postscript. */
ADRAW_FMT_EPS,
/** Scalable Vector Graphics. */
ADRAW_FMT_SVG
}
ADrawOutputType;
/** Supported colours.
* Enumerated type to describe colours.
*
* The 16 basic HTML colours at http://www.w3.org/TR/html4/types.html#h-6.5
* are defined as well as a few other common colour names.
*/
typedef enum
{
ADRAW_COL_WHITE = 0x00ffffff,
ADRAW_COL_BLACK = 0x00000000,
ADRAW_COL_RED = 0x00ff0000,
ADRAW_COL_ORANGE = 0x00ffb000,
ADRAW_COL_YELLOW = 0x00ffff00,
ADRAW_COL_GREEN = 0x0000ff00,
ADRAW_COL_BLUE = 0x000000ff,
ADRAW_COL_INDIGO = 0x00440088,
ADRAW_COL_VIOLET = 0x00d02090,
ADRAW_COL_SILVER = 0x00C0C0C0,
ADRAW_COL_LIME = 0x0000FF00,
ADRAW_COL_GRAY = 0x00808080,
ADRAW_COL_OLIVE = 0x00808000,
ADRAW_COL_MAROON = 0x00800000,
ADRAW_COL_NAVY = 0x00000080,
ADRAW_COL_PURPLE = 0x00800080,
ADRAW_COL_TEAL = 0x00008080,
ADRAW_COL_FUCHSIA = 0x00FF00FF,
ADRAW_COL_AQUA = 0x0000FFFF,
ADRAW_COL_INVALID = 0xff000000,
}
ADrawColour;
/** Basic font sizes.
* Enumerated type for different font sizes.
*/
typedef enum
{
ADRAW_FONT_TINY = 0,
ADRAW_FONT_SMALL
}
ADrawFontSize;
/** An ADraw context.
* This is the main structure used for accessing ADraw functions.
* ADrawOpen() returns an instance of this structure that can then be used
* to render to some device. Once drawing is complete, ADrawClose() should
* be called to reclaim resources and finalise any output.
*
* All the functions assume that 0,0 is in the top-left corner of the image,
* and that the dimensions grow towards w,y at the bottom-right corner.
*/
typedef struct ADrawTag
{
/** Draw a line.
* Draw a solid straight line between two points.
* \param ctx The drawing context.
* \param x1 The first x co-ordinate,
* \param y1 The first y co-ordinate,
* \param x2 The second x co-ordinate,
* \param y2 The second y co-ordinate,
*/
void (*line) (struct ADrawTag *ctx,
unsigned int x1,
unsigned int y1,
unsigned int x2,
unsigned int y2);
/** Draw a dotted line.
* Draw a dotted straight line between two points.
* \param ctx The drawing context.
* \param x1 The first x co-ordinate,
* \param y1 The first y co-ordinate,
* \param x2 The second x co-ordinate,
* \param y2 The second y co-ordinate,
*/
void (*dottedLine) (struct ADrawTag *ctx,
unsigned int x1,
unsigned int y1,
unsigned int x2,
unsigned int y2);
/** Left aligned text.
* Write a single line of text that will end at some co-ordinates.
* \param ctx The drawing context.
* \param x The position at which the text should terminate.
* \param y The position above which the text will lie.
* \param string The string to write.
*/
void (*textL) (struct ADrawTag *ctx,
unsigned int x,
unsigned int y,
const char *string);
/** Center aligned text.
* Write a single line of text that will center on some co-ordinates.
* \param ctx The drawing context.
* \param x The position at which the text should be centered.
* \param y The position above which the text will lie.
* \param string The string to write.
*/
void (*textC) (struct ADrawTag *ctx,
unsigned int x,
unsigned int y,
const char *string);
/** Right aligned text.
* Write a single line of text that will start at some co-ordinates.
* \param ctx The drawing context.
* \param x The position at which the text should start.
* \param y The position above which the text will lie.
* \param string The string to write.
*/
void (*textR) (struct ADrawTag *ctx,
unsigned int x,
unsigned int y,
const char *string);
/** Determine the width of some string.
* \param ctx The drawing context.
* \param string The string for which the width should be determined.
* \returns The width of the passed string as it would be rendered
* by the current drawing context.
*/
unsigned int (*textWidth) (struct ADrawTag *ctx,
const char *string);
/** Determine the height of text in the current font.
* \param ctx The drawing context.
*
*/
int (*textHeight) (struct ADrawTag *ctx);
void (*filledRectangle)(struct ADrawTag *ctx,
unsigned int x1,
unsigned int y1,
unsigned int x2,
unsigned int y2);
void (*filledTriangle)(struct ADrawTag *ctx,
unsigned int x1,
unsigned int y1,
unsigned int x2,
unsigned int y2,
unsigned int x3,
unsigned int y3);
void (*filledCircle)(struct ADrawTag *ctx,
unsigned int x,
unsigned int y,
unsigned int r);
/** Draw an arc.
* This draws an arc centred at (cx,cy) which fits in a box of \a w by \a h.
* The arc is drawn from \a s degrees to \a e degrees.
* \note 0 degrees points east on the page and 90 degrees is south.
*
*/
void (*arc) (struct ADrawTag *ctx,
unsigned int cx,
unsigned int cy,
unsigned int w,
unsigned int h,
unsigned int s,
unsigned int e);
void (*dottedArc) (struct ADrawTag *ctx,
unsigned int cx,
unsigned int cy,
unsigned int w,
unsigned int h,
unsigned int s,
unsigned int e);
void (*setPen) (struct ADrawTag *ctx,
ADrawColour col);
void (*setBgPen) (struct ADrawTag *ctx,
ADrawColour col);
void (*setFontSize) (struct ADrawTag *ctx,
ADrawFontSize size);
Boolean (*close) (struct ADrawTag *context);
/* Internal context, not accessible by the user */
void *internal;
}
ADraw;
/***************************************************************************
* Functions
***************************************************************************/
/** Create a new drawing context.
* This will create a drawing context with some dimensions, and some format.
* After this has been called, the function pointers in the returned structure
* can be called together with a pointer to the structure itself to cause
* image functions to be executed.
*
* \param[in] w The width of the output image.
* \param[in] h The height of the ouput image.
* \param[in] file The file to which the image should be written.
* \param[in] fontName The name of the font to use for rendering.
* \param[in] type The output type to generate.
* \param[in, out] *outContext Pointer to an \a ADraw structure to populate
* with values.
* \retval Boolean On error, #FALSE will be returned.
*/
Boolean ADrawOpen(unsigned int w,
unsigned int h,
const char *file,
const char *fontName,
ADrawOutputType type,
struct ADrawTag *outContext);
/** Given a string name for a colour, return the corresponding ADrawColour.
*
* \param[in] colour The string representation of the colour that is sought.
*/
ADrawColour ADrawGetColour(const char *colour);
/** Compute the position of a point on an arc.
* This allows co-ordinates on arc drawn using arc() or dottedArc() to be
* computed. The centre and bounding box for the arc are supplied as well
* as an angular offset.
*
* \param[in] cx Center of the arc.
* \param[in] cy Center of the arc.
* \param[in] w Arc x-diameter (width).
* \param[in] h Arc y-diameter (height).
* \param[in] degrees Position on the arc to be returned.
* \param[in,out] x Pointer to fill with x coordinate.
* \param[in,out] y Pointer to fill with y coordinate.
*/
void ADrawComputeArcPoint(float cx,
float cy,
float w,
float h,
float degrees,
unsigned int *x,
unsigned int *y);
#endif /* MSCGEN_ADRAW_H */
/* END OF FILE */
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