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/*
* File: notepadCore.c
*
* This file is a part of the Notepad demo application for ChibiOS/GFX
* Copyright © 2013, Kumar Abhishek [abhishek.kakkar@edaboard.com].
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * 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.
* * The name of 'Kumar Abhishek' may not be used to endorse or promote
* products derived from this software without specific prior
* written permission.
*
* DISCLAIMER OF WARRANTY:
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 <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.
*
* Modified by InMarket to allow it to compile on any GFX supported operating system.
*/
#include <stdlib.h>
#include "gfx.h"
#include "notepadCore.h"
#include "notepadUIDefines.h"
#define PEN_IN_DRAWING_AREA(ev) ((ev.x >= ncoreDrawingArea->x) && (ev.x <= (ncoreDrawingArea->x + ncoreDrawingArea->width)) && \
(ev.y >= ncoreDrawingArea->y) && (ev.y <= (ncoreDrawingArea->y + ncoreDrawingArea->height)))
/* This is the drawing core */
static DECLARE_THREAD_STACK(waDrawThread, NCORE_THD_STACK_SIZE);
static uint8_t nPenWidth = 1;
static uint8_t nMode = NCORE_MODE_DRAW;
static gThread nThd;
static GHandle ncoreDrawingArea = NULL;
static GHandle nStatusConsole = NULL;
static volatile gBool doExit;
static void draw_point(gCoord x, gCoord y) {
gColor c = ncoreDrawingArea->color;
if (nMode == NCORE_MODE_DRAW)
c = ncoreDrawingArea->color;
else if (nMode == NCORE_MODE_ERASE)
c = ncoreDrawingArea->bgcolor;
if (nPenWidth == 1)
gdispDrawPixel(x, y, c);
else
gdispFillCircle(x, y, nPenWidth, c);
}
/* Bresenham's Line Drawing Algorithm
Modified version to draw line of variable thickness */
static void draw_line(gCoord x0, gCoord y0, gCoord x1, gCoord y1) {
int16_t dy, dx;
int16_t addx, addy;
int16_t P, diff, i;
if (x1 >= x0) {
dx = x1 - x0;
addx = 1;
} else {
dx = x0 - x1;
addx = -1;
}
if (y1 >= y0) {
dy = y1 - y0;
addy = 1;
} else {
dy = y0 - y1;
addy = -1;
}
if (dx >= dy) {
dy *= 2;
P = dy - dx;
diff = P - dx;
for(i=0; i<=dx; ++i) {
draw_point(x0, y0);
if (P < 0) {
P += dy;
x0 += addx;
} else {
P += diff;
x0 += addx;
y0 += addy;
}
}
} else {
dx *= 2;
P = dx - dy;
diff = P - dy;
for(i=0; i<=dy; ++i) {
draw_point(x0, y0);
if (P < 0) {
P += dx;
y0 += addy;
} else {
P += diff;
x0 += addx;
y0 += addy;
}
}
}
}
/* Core thread */
static DECLARE_THREAD_FUNCTION(ncoreDrawThread, msg) {
GEventMouse ev, evPrev;
gCoord dx, dy;
int state = 0, dist;
(void)msg;
ginputGetMouseStatus(0, &evPrev);
while (!doExit) {
ginputGetMouseStatus(0, &ev);
switch(state) {
case 0: if (ev.meta == GMETA_MOUSE_DOWN) {
state = 1;
if (nMode == NCORE_MODE_FILL && PEN_IN_DRAWING_AREA(ev)) {
// Set bgcolor to current color, clear the display.
ncoreDrawingArea->bgcolor = ncoreDrawingArea->color;
gwinClear(ncoreDrawingArea);
}
}
else
gfxYield();
break;
case 1: if (ev.meta == GMETA_MOUSE_UP) {
state = 0;
//gwinPrintf(nStatusConsole, "\nPen Up: (%d, %d)", ev.x, ev.y);
break;
}
dx = abs(ev.x - evPrev.x);
dy = abs(ev.y - evPrev.y);
dist = dx * dx + dy * dy;
if (dist > 0)
{
gdispSetClip(ncoreDrawingArea->x,
ncoreDrawingArea->y,
ncoreDrawingArea->width,
ncoreDrawingArea->height);
if (PEN_IN_DRAWING_AREA(ev)){
// Do Interpolation
if (dist <= 2) {
draw_point(ev.x, ev.y);
}
else if (dist <= 5) {
// Line drawing does not give good results for this case.
// So draw two pixels directly
draw_point(ev.x, ev.y);
draw_point((ev.x + evPrev.x) / 2, (ev.y + evPrev.y) / 2);
}
else if (dx * dx <= MAX_DX && dy * dy <= MAX_DY) {
draw_line(ev.x, ev.y, evPrev.x, evPrev.y);
}
}
//gwinPrintf(nStatusConsole, "\nPen Down: (%d, %d)", ev.x, ev.y);
}
break;
}
evPrev = ev;
}
return 0;
}
/* Spawn the core thread */
void ncoreSpawnDrawThread(GHandle drawingArea, GHandle statusConsole) {
ncoreDrawingArea = drawingArea;
nStatusConsole = statusConsole;
doExit = gFalse;
nThd = gfxThreadCreate(waDrawThread,
sizeof(waDrawThread),
NCORE_THD_PRIO,
ncoreDrawThread,
NULL);
}
/* Terminate the core thread, wait for control release */
void ncoreTerminateDrawThread(void) {
doExit = gTrue;
gfxThreadWait(nThd);
nThd = 0;
}
/* Get and set the pen width
* Brush is cicular, width is pixel radius */
void ncoreSetPenWidth(uint8_t penWidth) { nPenWidth = penWidth; }
uint8_t ncoreGetPenWidth(void) { return nPenWidth; }
/* Get and set the drawing color */
void ncoreSetPenColor(gColor penColor) { gwinSetColor(ncoreDrawingArea, penColor); }
gColor ncoreGetPenColor(void) { return ncoreDrawingArea->color; }
/* Set mode */
void ncoreSetMode(uint8_t mode) { nMode = mode; }
uint8_t ncoreGetMode(void) { return nMode; }