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drawing.c
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drawing.c
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/**************************************************************************/
/*!
@file drawing.c
@author K. Townsend (microBuilder.eu)
drawLine and drawCircle adapted from a tutorial by Leonard McMillan:
http://www.cs.unc.edu/~mcmillan/
@section LICENSE
Software License Agreement (BSD License)
Copyright (c) 2010, microBuilder SARL
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
3. Neither the name of the copyright holders nor the
names of its contributors may be used to endorse or promote products
derived from this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ''AS IS'' AND ANY
EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE FOR ANY
DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**************************************************************************/
#include <string.h>
#include "drawing.h"
/**************************************************************************/
/* */
/* ----------------------- Private Methods ------------------------------ */
/* */
/**************************************************************************/
/**************************************************************************/
/*!
@brief Swaps values a and b
*/
/**************************************************************************/
void drawSwap(uint32_t a, uint32_t b)
{
uint32_t t;
t = a;
a = b;
b = t;
}
/**************************************************************************/
/* */
/* ----------------------- Public Methods ------------------------------- */
/* */
/**************************************************************************/
/**************************************************************************/
/*!
@brief Draws a single pixel at the specified location
@param[in] x
Horizontal position
@param[in] y
Vertical position
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawPixel(uint16_t x, uint16_t y, uint16_t color)
{
if ((x < lcdGetWidth()) && (y < lcdGetHeight()))
{
lcdDrawPixel(x, y, color);
}
}
/**************************************************************************/
/*!
@brief Fills the screen with the specified color
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawFill(uint16_t color)
{
lcdFillRGB(color);
}
/**************************************************************************/
/*!
@brief Draws a simple color test pattern
*/
/**************************************************************************/
void drawTestPattern(void)
{
lcdTest();
}
/**************************************************************************/
/*!
@brief Draws a bresenham line
@param[in] x0
Starting x co-ordinate
@param[in] y0
Starting y co-ordinate
@param[in] x1
Ending x co-ordinate
@param[in] y1
Ending y co-ordinate
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawLine ( uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t color )
{
drawLineDotted(x0, y0, x1, y1, 0, 1, color);
}
/**************************************************************************/
/*!
@brief Draws a bresenham line with a fixed pattern of empty
and solid pixels
Based on: http://www.cs.unc.edu/~mcmillan/comp136/Lecture6/Lines.html
@param[in] x0
Starting x co-ordinate
@param[in] y0
Starting y co-ordinate
@param[in] x1
Ending x co-ordinate
@param[in] y1
Ending y co-ordinate
@param[in] empty
The number of 'empty' pixels to render
@param[in] solid
The number of 'solid' pixels to render
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawLineDotted ( uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t empty, uint16_t solid, uint16_t color )
{
if (solid == 0)
{
return;
}
// If a negative y int was passed in it will overflow to 65K something
// Ugly, but drawCircleFilled() can pass in negative values so we need
// to check the values here
y0 = y0 > 65000 ? 0 : y0;
y1 = y1 > 65000 ? 0 : y1;
// Check if we can use the optimised horizontal line method
if ((y0 == y1) && (empty == 0))
{
lcdDrawHLine(x0, x1, y0, color);
return;
}
// Check if we can use the optimised vertical line method.
// This can make a huge difference in performance, but may
// not work properly on every LCD controller:
if ((x0 == x1) && (empty == 0))
{
// Warning: This may actually be slower than drawing individual pixels on
// short lines ... Set a minimum line size to use the 'optimised' method
// (which changes the screen orientation) ?
lcdDrawVLine(x0, y0, y1, color);
return;
}
// Draw non-horizontal or dotted line
int dy = y1 - y0;
int dx = x1 - x0;
int stepx, stepy;
int emptycount, solidcount;
if (dy < 0) // y wird kleiner
{
dy = -dy;
stepy = -1;
}
else
{
stepy = 1;
}
if (dx < 0) // x wird kleiner
{
dx = -dx;
stepx = -1;
}
else
{
stepx = 1;
}
dy <<= 1; // dy is now 2*dy
dx <<= 1; // dx is now 2*dx
emptycount = empty;
solidcount = solid;
drawPixel(x0, y0, color); // always start with solid pixels
solidcount--;
if (dx > dy)
{
int fraction = dy - (dx >> 1); // same as 2*dy - dx
while (x0 != x1)
{
if (fraction >= 0)
{
y0 += stepy;
fraction -= dx; // same as fraction -= 2*dx
}
x0 += stepx;
fraction += dy; // same as fraction -= 2*dy
if (empty == 0)
{
// always draw a pixel ... no dotted line requested
drawPixel(x0, y0, color);
}
else if (solidcount)
{
// Draw solid pxiel and decrement counter
drawPixel(x0, y0, color);
solidcount--;
}
else if(emptycount)
{
// Empty pixel ... don't draw anything an decrement counter
emptycount--;
}
else
{
// Reset counters and draw solid pixel
emptycount = empty;
solidcount = solid;
drawPixel(x0, y0, color);
solidcount--;
}
}
}
else
{
int fraction = dx - (dy >> 1);
while (y0 != y1)
{
if (fraction >= 0)
{
x0 += stepx;
fraction -= dy;
}
y0 += stepy;
fraction += dx;
if (empty == 0)
{
// always draw a pixel ... no dotted line requested
drawPixel(x0, y0, color);
}
if (solidcount)
{
// Draw solid pxiel and decrement counter
drawPixel(x0, y0, color);
solidcount--;
}
else if(emptycount)
{
// Empty pixel ... don't draw anything an decrement counter
emptycount--;
}
else
{
// Reset counters and draw solid pixel
emptycount = empty;
solidcount = solid;
drawPixel(x0, y0, color);
solidcount--;
}
}
}
}
/**************************************************************************/
/*!
@brief Draws a circle
Based on: http://www.cs.unc.edu/~mcmillan/comp136/Lecture7/circle.html
@param[in] xCenter
The horizontal center of the circle
@param[in] yCenter
The vertical center of the circle
@param[in] radius
The circle's radius in pixels
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawCircle (uint16_t xCenter, uint16_t yCenter, uint16_t radius, uint16_t color)
{
drawPixel(xCenter, yCenter+radius, color);
drawPixel(xCenter, yCenter-radius, color);
drawPixel(xCenter+radius, yCenter, color);
drawPixel(xCenter-radius, yCenter, color);
drawCorner(xCenter, yCenter, radius, DRAW_CORNERS_ALL, color);
}
/**************************************************************************/
/*!
@brief Draws a filled circle
@param[in] xCenter
The horizontal center of the circle
@param[in] yCenter
The vertical center of the circle
@param[in] radius
The circle's radius in pixels
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawCircleFilled (uint16_t xCenter, uint16_t yCenter, uint16_t radius, uint16_t color)
{
int16_t f = 1 - radius;
int16_t ddF_x = 1;
int16_t ddF_y = -2 * radius;
int16_t x = 0;
int16_t y = radius;
int16_t xc_px, yc_my, xc_mx, xc_py, yc_mx, xc_my;
int16_t lcdWidth = lcdGetWidth();
if (xCenter < lcdWidth) drawLine(xCenter, yCenter-radius < 0 ? 0 : yCenter-radius, xCenter, (yCenter-radius) + (2*radius), color);
while (x<y)
{
if (f >= 0)
{
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
xc_px = xCenter+x;
xc_mx = xCenter-x;
xc_py = xCenter+y;
xc_my = xCenter-y;
yc_mx = yCenter-x;
yc_my = yCenter-y;
// Make sure X positions are not negative or too large or the pixels will
// overflow. Y overflow is handled in drawLine().
if ((xc_px < lcdWidth) && (xc_px >= 0)) drawLine(xc_px, yc_my, xc_px, yc_my + 2*y, color);
if ((xc_mx < lcdWidth) && (xc_mx >= 0)) drawLine(xc_mx, yc_my, xc_mx, yc_my + 2*y, color);
if ((xc_py < lcdWidth) && (xc_py >= 0)) drawLine(xc_py, yc_mx, xc_py, yc_mx + 2*x, color);
if ((xc_my < lcdWidth) && (xc_my >= 0)) drawLine(xc_my, yc_mx, xc_my, yc_mx + 2*x, color);
}
}
/**************************************************************************/
/*!
@brief Draws a single 1-pixel wide corner
@note Code courtesy Adafruit's excellent GFX lib:
https://github.com/adafruit/Adafruit-GFX-Library
@param[in] xCenter
The horizontal center of the circle
@param[in] yCenter
The vertical center of the circle
@param[in] corner
The drawCorners_t representing the corner(s) to draw
@param[in] color
Color used when drawing
@section EXAMPLE
@code
// Draw a top-left corner with a 10 pixel radius, centered at 20, 20
drawCorner(20, 20, 10, DRAW_CORNER_TOPLEFT, COLOR_GRAY_128);
@endcode
*/
/**************************************************************************/
void drawCorner (uint16_t xCenter, uint16_t yCenter, uint16_t r, drawCorners_t corner, uint16_t color)
{
int16_t f = 1 - r;
int16_t ddF_x = 1;
int16_t ddF_y = -2 * r;
int16_t x = 0;
int16_t y = r;
while (x<y)
{
if (f >= 0)
{
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
if (corner & DRAW_CORNERS_BOTTOMRIGHT)
{
drawPixel(xCenter + x, yCenter + y, color);
drawPixel(xCenter + y, yCenter + x, color);
}
if (corner & DRAW_CORNERS_TOPRIGHT)
{
drawPixel(xCenter + x, yCenter - y, color);
drawPixel(xCenter + y, yCenter - x, color);
}
if (corner & DRAW_CORNERS_BOTTOMLEFT)
{
drawPixel(xCenter - y, yCenter + x, color);
drawPixel(xCenter - x, yCenter + y, color);
}
if (corner & DRAW_CORNERS_TOPLEFT)
{
drawPixel(xCenter - y, yCenter - x, color);
drawPixel(xCenter - x, yCenter - y, color);
}
}
}
/**************************************************************************/
/*!
@brief Draws a filled rounded corner
@param[in] xCenter
The horizontal center of the circle
@param[in] yCenter
The vertical center of the circle
@param[in] radius
The circle's radius in pixels
@param[in] position
The position of the corner, which affects how it will
be rendered
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawCornerFilled (uint16_t xCenter, uint16_t yCenter, uint16_t radius, drawCorners_t position, uint16_t color)
{
int16_t f = 1 - radius;
int16_t ddF_x = 1;
int16_t ddF_y = -2 * radius;
int16_t x = 0;
int16_t y = radius;
int16_t xc_px, yc_my, xc_mx, xc_py, yc_mx, xc_my;
int16_t lcdWidth = lcdGetWidth();
if ((position & DRAW_CORNERS_TOPRIGHT) || (position & DRAW_CORNERS_TOPLEFT))
{
if (xCenter < lcdWidth) drawLine(xCenter, yCenter-radius < 0 ? 0 : yCenter-radius, xCenter, yCenter, color);
}
if ((position & DRAW_CORNERS_BOTTOMRIGHT) || (position & DRAW_CORNERS_BOTTOMLEFT))
{
if (xCenter < lcdWidth) drawLine(xCenter, yCenter-radius < 0 ? 0 : yCenter, xCenter, (yCenter-radius) + (2*radius), color);
}
while (x<y)
{
if (f >= 0)
{
y--;
ddF_y += 2;
f += ddF_y;
}
x++;
ddF_x += 2;
f += ddF_x;
xc_px = xCenter+x;
xc_mx = xCenter-x;
xc_py = xCenter+y;
xc_my = xCenter-y;
yc_mx = yCenter-x;
yc_my = yCenter-y;
if (position & DRAW_CORNERS_TOPRIGHT)
{
if ((xc_px < lcdWidth) && (xc_px >= 0)) drawLine(xc_px, yc_my, xc_px, yCenter, color);
if ((xc_py < lcdWidth) && (xc_py >= 0)) drawLine(xc_py, yc_mx, xc_py, yCenter, color);
}
if (position & DRAW_CORNERS_BOTTOMRIGHT)
{
if ((xc_px < lcdWidth) && (xc_px >= 0)) drawLine(xc_px, yCenter, xc_px, yc_my + 2*y, color);
if ((xc_py < lcdWidth) && (xc_py >= 0)) drawLine(xc_py, yCenter, xc_py, yc_mx + 2*x, color);
}
if (position & DRAW_CORNERS_TOPLEFT)
{
if ((xc_mx < lcdWidth) && (xc_mx >= 0)) drawLine(xc_mx, yc_my, xc_mx, yCenter, color);
if ((xc_my < lcdWidth) && (xc_my >= 0)) drawLine(xc_my, yc_mx, xc_my, yCenter, color);
}
if (position & DRAW_CORNERS_BOTTOMLEFT)
{
if ((xc_mx < lcdWidth) && (xc_mx >= 0)) drawLine(xc_mx, yCenter, xc_mx, yc_my + 2*y, color);
if ((xc_my < lcdWidth) && (xc_my >= 0)) drawLine(xc_my, yCenter, xc_my, yc_mx + 2*x, color);
}
}
}
/**************************************************************************/
/*!
@brief Draws a simple arrow of the specified width
@param[in] x
X co-ordinate of the smallest point of the arrow
@param[in] y
Y co-ordinate of the smallest point of the arrow
@param[in] size
Total width/height of the arrow in pixels
@param[in] direction
The direction that the arrow is pointing
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawArrow(uint16_t x, uint16_t y, uint16_t size, drawDirection_t direction, uint16_t color)
{
drawPixel(x, y, color);
if (size == 1)
{
return;
}
uint32_t i;
switch (direction)
{
case DRAW_DIRECTION_LEFT:
for (i = 1; i<size; i++)
{
drawLine(x+i, y-i, x+i, y+i, color);
}
break;
case DRAW_DIRECTION_RIGHT:
for (i = 1; i<size; i++)
{
drawLine(x-i, y-i, x-i, y+i, color);
}
break;
case DRAW_DIRECTION_UP:
for (i = 1; i<size; i++)
{
drawLine(x-i, y+i, x+i, y+i, color);
}
break;
case DRAW_DIRECTION_DOWN:
for (i = 1; i<size; i++)
{
drawLine(x-i, y-i, x+i, y-i, color);
}
break;
default:
break;
}
}
/**************************************************************************/
/*!
@brief Draws a simple (empty) rectangle
@param[in] x0
Starting x co-ordinate
@param[in] y0
Starting y co-ordinate
@param[in] x1
Ending x co-ordinate
@param[in] y1
Ending y co-ordinate
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawRectangle ( uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t color)
{
uint16_t x, y;
if (y1 < y0)
{
// Switch y1 and y0
y = y1;
y1 = y0;
y0 = y;
}
if (x1 < x0)
{
// Switch x1 and x0
x = x1;
x1 = x0;
x0 = x;
}
drawLine (x0, y0, x1, y0, color);
drawLine (x1, y0, x1, y1, color);
drawLine (x1, y1, x0, y1, color);
drawLine (x0, y1, x0, y0, color);
}
/**************************************************************************/
/*!
@brief Draws a filled rectangle
@param[in] x0
Starting x co-ordinate
@param[in] y0
Starting y co-ordinate
@param[in] x1
Ending x co-ordinate
@param[in] y1
Ending y co-ordinate
@param[in] color
Color used when drawing
*/
/**************************************************************************/
void drawRectangleFilled ( uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t color)
{
int height;
uint16_t x, y;
if (y1 < y0)
{
// Switch y1 and y0
y = y1;
y1 = y0;
y0 = y;
}
if (x1 < x0)
{
// Switch x1 and x0
x = x1;
x1 = x0;
x0 = x;
}
height = y1 - y0;
for (height = y0; y1 > height - 1; ++height)
{
drawLine(x0, height, x1, height, color);
}
}
/**************************************************************************/
/*!
@brief Draws a rectangle with rounded corners
@param[in] x0
Starting x co-ordinate
@param[in] y0
Starting y co-ordinate
@param[in] x1
Ending x co-ordinate
@param[in] y1
Ending y co-ordinate
@param[in] color
Color used when drawing
@param[in] radius
Corner radius in pixels
@param[in] corners
Which corners to round
@section EXAMPLE
@code
drawRoundedRectangle ( 10, 10, 200, 200, COLOR_BLACK, 10, DRAW_CORNERS_ALL );
@endcode
*/
/**************************************************************************/
void drawRoundedRectangle ( uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t color, uint16_t radius, drawCorners_t corners )
{
int height;
uint16_t y;
if (corners == DRAW_CORNERS_NONE)
{
drawRectangle(x0, y0, x1, y1, color);
return;
}
// Calculate height
if (y1 < y0)
{
y = y1;
y1 = y0;
y0 = y;
}
height = y1 - y0;
// Check radius
if (radius > height / 2)
{
radius = height / 2;
}
radius -= 1;
switch (corners)
{
case DRAW_CORNERS_ALL:
drawCorner(x0 + radius, y0 + radius, radius, DRAW_CORNERS_TOPLEFT, color);
drawCorner(x1 - radius, y0 + radius, radius, DRAW_CORNERS_TOPRIGHT, color);
drawCorner(x0 + radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMLEFT, color);
drawCorner(x1 - radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMRIGHT, color);
if (radius*2+1 < height)
{
drawLine(x0, y0+radius, x0, y1-radius, color);
drawLine(x1, y0+radius, x1, y1-radius, color);
}
drawLine(x0+radius, y0, x1-radius, y0, color);
drawLine(x0+radius, y1, x1-radius, y1, color);
break;
case DRAW_CORNERS_TOP:
drawCorner(x0 + radius, y0 + radius, radius, DRAW_CORNERS_TOPLEFT, color);
drawCorner(x1 - radius, y0 + radius, radius, DRAW_CORNERS_TOPRIGHT, color);
drawLine(x0, y0+radius, x0, y1, color);
drawLine(x0, y1, x1, y1, color);
drawLine(x1, y1, x1, y0+radius, color);
drawLine(x0+radius, y0, x1-radius, y0, color);
break;
case DRAW_CORNERS_BOTTOM:
drawCorner(x0 + radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMLEFT, color);
drawCorner(x1 - radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMRIGHT, color);
drawLine(x0, y0, x1, y0, color);
drawLine(x1, y0, x1, y1-radius, color );
drawLine(x1-radius, y1, x0+radius, y1, color);
drawLine(x0, y1-radius, x0, y0, color);
break;
case DRAW_CORNERS_LEFT:
drawCorner(x0 + radius, y0 + radius, radius, DRAW_CORNERS_TOPLEFT, color);
drawCorner(x0 + radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMLEFT, color);
if (radius*2+1 < height)
{
drawLine(x0, y0+radius, x0, y1-radius, color);
}
drawLine(x1, y0, x1, y1, color);
drawLine(x0+radius, y0, x1, y0, color);
drawLine(x0+radius, y1, x1, y1, color);
break;
case DRAW_CORNERS_RIGHT:
drawCorner(x1 - radius, y0 + radius, radius, DRAW_CORNERS_TOPRIGHT, color);
drawCorner(x1 - radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMRIGHT, color);
if (radius*2+1 < height)
{
drawLine(x1, y0+radius, x1, y1-radius, color);
}
drawLine(x0, y0, x0, y1, color);
drawLine(x0, y0, x1-radius, y0, color);
drawLine(x0, y1, x1-radius, y1, color);
break;
default:
break;
}
}
/**************************************************************************/
/*!
@brief Draws a filled rectangle with rounded corners
@param[in] x0
Starting x co-ordinate
@param[in] y0
Starting y co-ordinate
@param[in] x1
Ending x co-ordinate
@param[in] y1
Ending y co-ordinate
@param[in] color
Color used when drawing
@param[in] radius
Corner radius in pixels
@param[in] corners
Which corners to round
*/
/**************************************************************************/
void drawRoundedRectangleFilled ( uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t color, uint16_t radius, drawCorners_t corners )
{
int height;
uint16_t y;
if (corners == DRAW_CORNERS_NONE)
{
drawRectangleFilled(x0, y0, x1, y1, color);
return;
}
// Calculate height
if (y1 < y0)
{
y = y1;
y1 = y0;
y0 = y;
}
height = y1 - y0;
// Check radius
if (radius > height / 2)
{
radius = height / 2;
}
radius -= 1;
// Draw body
drawRectangleFilled(x0 + radius, y0, x1 - radius, y1, color);
switch (corners)
{
case DRAW_CORNERS_ALL:
drawCornerFilled(x0 + radius, y0 + radius, radius, DRAW_CORNERS_TOPLEFT, color);
drawCornerFilled(x1 - radius, y0 + radius, radius, DRAW_CORNERS_TOPRIGHT, color);
drawCornerFilled(x0 + radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMLEFT, color);
drawCornerFilled(x1 - radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMRIGHT, color);
if (radius*2+1 < height)
{
drawRectangleFilled(x0, y0 + radius, x0 + radius, y1 - radius, color);
drawRectangleFilled(x1 - radius, y0 + radius, x1, y1 - radius, color);
}
break;
case DRAW_CORNERS_TOP:
drawCornerFilled(x0 + radius, y0 + radius, radius, DRAW_CORNERS_TOPLEFT, color);
drawCornerFilled(x1 - radius, y0 + radius, radius, DRAW_CORNERS_TOPRIGHT, color);
drawRectangleFilled(x0, y0 + radius, x0 + radius, y1, color);
drawRectangleFilled(x1 - radius, y0 + radius, x1, y1, color);
break;
case DRAW_CORNERS_BOTTOM:
drawCornerFilled(x0 + radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMLEFT, color);
drawCornerFilled(x1 - radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMRIGHT, color);
drawRectangleFilled(x0, y0, x0 + radius, y1 - radius, color);
drawRectangleFilled(x1 - radius, y0, x1, y1 - radius, color);
break;
case DRAW_CORNERS_LEFT:
drawCornerFilled(x0 + radius, y0 + radius, radius, DRAW_CORNERS_TOPLEFT, color);
drawCornerFilled(x0 + radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMLEFT, color);
if (radius*2+1 < height)
{
drawRectangleFilled(x0, y0 + radius, x0 + radius, y1 - radius, color);
}
drawRectangleFilled(x1 - radius, y0, x1, y1, color);
break;
case DRAW_CORNERS_RIGHT:
drawCornerFilled(x1 - radius, y0 + radius, radius, DRAW_CORNERS_TOPRIGHT, color);
drawCornerFilled(x1 - radius, y1 - radius, radius, DRAW_CORNERS_BOTTOMRIGHT, color);
if (radius*2+1 < height)
{
drawRectangleFilled(x1 - radius, y0 + radius, x1, y1 - radius, color);
}
drawRectangleFilled(x0, y0, x0 + radius, y1, color);
break;
default:
break;
}
}
/**************************************************************************/
/*!
@brief Draws a gradient-filled rectangle
@param[in] x0
Starting x co-ordinate
@param[in] y0
Starting y co-ordinate
@param[in] x1
Ending x co-ordinate
@param[in] y1
Ending y co-ordinate
@param[in] startColor
The color at the start of the gradient
@param[in] endColor
The color at the end of the gradient
@section EXAMPLE
@code
#include "drivers/displays/tft/drawing.h"
#include "drivers/displays/tft/aafonts.h"
#include "drivers/displays/tft/aafonts/aa2/DejaVuSansCondensed14_AA2.h"
// Draw a gradient-filled rectangle with anti-aliased text inside it
uint16_t btnWidth, btnHeight, btnX, btnY;
uint16_t fntX, fntY;
btnWidth = 200;
btnHeight = 20;
btnX = 10;
btnY = 30;
lcdFillRGB(0xFFFF);
drawRectangle(btnX-1, btnY-1, btnX+btnWidth+1, btnY+btnHeight+1, COLOR_GRAY_80);
drawGradient(btnX, btnY, btnX+btnWidth, btnY+btnHeight, COLOR_WHITE, COLOR_GRAY_128);
// Center text vertically and horizontally
fntY = btnY + ((btnHeight - DejaVuSansCondensed14_AA2.fontHeight) / 2);
fntX = btnX + ((btnWidth - aafontsGetStringWidth(&DejaVuSansCondensed14_AA2, "Click to continue"))/2);
aafontsDrawString(fntX, fntY, COLORTABLE_AA2_BLACKONWHITE, &DejaVuSansCondensed14_AA2, "Click to continue");
@endcode
*/
/**************************************************************************/
void drawGradient ( uint16_t x0, uint16_t y0, uint16_t x1, uint16_t y1, uint16_t startColor, uint16_t endColor)
{
int height;
uint16_t x, y;
uint8_t r, g, b;
int16_t rDelta, gDelta, bDelta;
// Clear gradient steps, etc.
r = g = b = 0;
rDelta = gDelta = bDelta = 0;
if (y1 < y0)
{
// Switch y1 and y0
y = y1;
y1 = y0;
y0 = y;
}
if (x1 < x0)
{
// Switch x1 and x0
x = x1;
x1 = x0;
x0 = x;
}
height = y1 - y0;
// Calculate global r/g/b changes between start and end colors
rDelta = ((endColor >> 11) & 0x1F) - ((startColor >> 11) & 0x1F);
gDelta = ((endColor >> 5) & 0x3F) - ((startColor >> 5) & 0x3F);
bDelta = (endColor & 0x1F) - (startColor & 0x1F);
// Calculate interpolation deltas to 2 decimal places (fixed point)
rDelta = (rDelta * 100) / height;
gDelta = (gDelta * 100) / height;
bDelta = (bDelta * 100) / height;
// Draw individual lines
for (height = y0; y1 > height - 1; ++height)
{
// Calculate new rgb values based on: start color + (line number * interpolation delta)
r = ((startColor >> 11) & 0x1F) + ((rDelta * (height - y0)) / 100);
g = ((startColor >> 5) & 0x3F) + ((gDelta * (height - y0)) / 100);
b = (startColor & 0x1F) + ((bDelta * (height - y0)) / 100);
drawLine(x0, height, x1, height, ((r & 0x1F) << 11) | ((g & 0x3F) << 5) | (b & 0x1F));
}
}
/**************************************************************************/
/*!
@brief Draws a triangle
@param[in] x0
x co-ordinate for point 0
@param[in] y0
y co-ordinate for point 0
@param[in] x1
x co-ordinate for point 1
@param[in] y1
y co-ordinate for point 1
@param[in] x2
x co-ordinate for point 2
@param[in] y2
y co-ordinate for point 2
@param[in] color
Color used when drawing
*/
/**************************************************************************/