132 lines
3.6 KiB
C
132 lines
3.6 KiB
C
/*
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ucg_line.c
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Universal uC Color Graphics Library
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Copyright (c) 2013, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "ucg.h"
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void ucg_Draw90Line(ucg_t *ucg, ucg_int_t x, ucg_int_t y, ucg_int_t len, ucg_int_t dir, ucg_int_t col_idx)
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{
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ucg->arg.pixel.rgb.color[0] = ucg->arg.rgb[col_idx].color[0];
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ucg->arg.pixel.rgb.color[1] = ucg->arg.rgb[col_idx].color[1];
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ucg->arg.pixel.rgb.color[2] = ucg->arg.rgb[col_idx].color[2];
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ucg->arg.pixel.pos.x = x;
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ucg->arg.pixel.pos.y = y;
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ucg->arg.len = len;
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ucg->arg.dir = dir;
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ucg_DrawL90FXWithArg(ucg);
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}
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void ucg_DrawHLine(ucg_t *ucg, ucg_int_t x, ucg_int_t y, ucg_int_t len)
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{
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ucg_Draw90Line(ucg, x, y, len, 0, 0);
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}
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void ucg_DrawVLine(ucg_t *ucg, ucg_int_t x, ucg_int_t y, ucg_int_t len)
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{
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ucg_Draw90Line(ucg, x, y, len, 1, 0);
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}
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void ucg_DrawHRLine(ucg_t *ucg, ucg_int_t x, ucg_int_t y, ucg_int_t len)
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{
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ucg_Draw90Line(ucg, x, y, len, 2, 0);
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}
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void ucg_DrawGradientLine(ucg_t *ucg, ucg_int_t x, ucg_int_t y, ucg_int_t len, ucg_int_t dir)
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{
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/* color goes from ucg->arg.rgb[0] to ucg->arg.rgb[1] */
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ucg->arg.pixel.pos.x = x;
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ucg->arg.pixel.pos.y = y;
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ucg->arg.len = len;
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ucg->arg.dir = dir;
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ucg_DrawL90SEWithArg(ucg);
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}
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void ucg_DrawLine(ucg_t *ucg, ucg_int_t x1, ucg_int_t y1, ucg_int_t x2, ucg_int_t y2)
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{
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ucg_int_t tmp;
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ucg_int_t x,y;
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ucg_int_t dx, dy;
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ucg_int_t err;
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ucg_int_t ystep;
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uint8_t swapxy = 0;
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/* no BBX intersection check at the moment... */
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ucg->arg.pixel.rgb.color[0] = ucg->arg.rgb[0].color[0];
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ucg->arg.pixel.rgb.color[1] = ucg->arg.rgb[0].color[1];
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ucg->arg.pixel.rgb.color[2] = ucg->arg.rgb[0].color[2];
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if ( x1 > x2 ) dx = x1-x2; else dx = x2-x1;
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if ( y1 > y2 ) dy = y1-y2; else dy = y2-y1;
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if ( dy > dx )
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{
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swapxy = 1;
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tmp = dx; dx =dy; dy = tmp;
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tmp = x1; x1 =y1; y1 = tmp;
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tmp = x2; x2 =y2; y2 = tmp;
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}
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if ( x1 > x2 )
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{
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tmp = x1; x1 =x2; x2 = tmp;
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tmp = y1; y1 =y2; y2 = tmp;
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}
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err = dx >> 1;
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if ( y2 > y1 ) ystep = 1; else ystep = -1;
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y = y1;
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for( x = x1; x <= x2; x++ )
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{
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if ( swapxy == 0 )
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{
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ucg->arg.pixel.pos.x = x;
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ucg->arg.pixel.pos.y = y;
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}
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else
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{
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ucg->arg.pixel.pos.x = y;
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ucg->arg.pixel.pos.y = x;
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}
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ucg_DrawPixelWithArg(ucg);
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err -= (uint8_t)dy;
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if ( err < 0 )
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{
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y += ystep;
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err += dx;
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}
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}
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}
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