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https://github.com/Valeh2012/PersonalVotingMachine
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256 lines
6.9 KiB
C
256 lines
6.9 KiB
C
/*
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u8g2_hvline.c
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Universal 8bit Graphics Library (https://github.com/olikraus/u8g2/)
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Copyright (c) 2016, 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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Calltree
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void u8g2_DrawHVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir)
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u8g2->cb->draw_l90
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u8g2_draw_hv_line_2dir
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u8g2->ll_hvline(u8g2, x, y, len, dir);
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*/
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#include "u8g2.h"
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#include <assert.h>
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/*==========================================================*/
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/* intersection procedure */
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/*
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Description:
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clip range from pos a (included) with line len (a+len excluded) agains c (included) to d (excluded)
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Assumptions:
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len > 0
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c <= d (this is not checked)
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will return 0 if there is no intersection and if a > b
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*/
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static uint8_t u8g2_clip_intersection2(u8g2_uint_t *ap, u8g2_uint_t *len, u8g2_uint_t c, u8g2_uint_t d)
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{
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u8g2_uint_t a = *ap;
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u8g2_uint_t b;
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b = a;
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b += *len;
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/*
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Description:
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clip range from a (included) to b (excluded) agains c (included) to d (excluded)
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Assumptions:
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a <= b (violation is checked and handled correctly)
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c <= d (this is not checked)
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will return 0 if there is no intersection and if a > b
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optimized clipping: c is set to 0 --> 27 Oct 2018: again removed the c==0 assumption
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replaced by uint8_t u8g2_clip_intersection2
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*/
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/* handle the a>b case correctly. If code and time is critical, this could */
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/* be removed completly (be aware about memory curruption for wrong */
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/* arguments) or return 0 for a>b (will lead to skipped lines for wrong */
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/* arguments) */
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/* removing the following if clause completly may lead to memory corruption of a>b */
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if ( a > b )
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{
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/* replacing this if with a simple "return 0;" will not handle the case with negative a */
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if ( a < d )
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{
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b = d;
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b--;
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}
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else
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{
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a = c;
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}
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}
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/* from now on, the asumption a <= b is ok */
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if ( a >= d )
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return 0;
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if ( b <= c )
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return 0;
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if ( a < c )
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a = c;
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if ( b > d )
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b = d;
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*ap = a;
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b -= a;
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*len = b;
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return 1;
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}
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/*==========================================================*/
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/* draw procedures */
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/*
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x,y Upper left position of the line within the pixel buffer
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len length of the line in pixel, len must not be 0
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dir 0: horizontal line (left to right)
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1: vertical line (top to bottom)
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This function first adjusts the y position to the local buffer. Then it
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will clip the line and call u8g2_draw_low_level_hv_line()
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*/
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void u8g2_draw_hv_line_2dir(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir)
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{
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/* clipping happens before the display rotation */
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/* transform to pixel buffer coordinates */
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y -= u8g2->pixel_curr_row;
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u8g2->ll_hvline(u8g2, x, y, len, dir);
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}
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/*
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This is the toplevel function for the hv line draw procedures.
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This function should be called by the user.
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"dir" may have 4 directions: 0 (left to right), 1, 2, 3 (down up)
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*/
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void u8g2_DrawHVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len, uint8_t dir)
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{
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/* Make a call to the callback function (e.g. u8g2_draw_l90_r0). */
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/* The callback may rotate the hv line */
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/* after rotation this will call u8g2_draw_hv_line_4dir() */
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#ifdef U8G2_WITH_CLIP_WINDOW_SUPPORT
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if ( u8g2->is_page_clip_window_intersection != 0 )
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#endif /* U8G2_WITH_CLIP_WINDOW_SUPPORT */
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if ( len != 0 )
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{
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/* convert to two directions */
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if ( len > 1 )
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{
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if ( dir == 2 )
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{
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x -= len;
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x++;
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}
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else if ( dir == 3 )
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{
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y -= len;
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y++;
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}
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}
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dir &= 1;
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/* clip against the user window */
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if ( dir == 0 )
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{
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if ( y < u8g2->user_y0 )
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return;
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if ( y >= u8g2->user_y1 )
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return;
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if ( u8g2_clip_intersection2(&x, &len, u8g2->user_x0, u8g2->user_x1) == 0 )
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return;
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}
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else
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{
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if ( x < u8g2->user_x0 )
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return;
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if ( x >= u8g2->user_x1 )
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return;
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if ( u8g2_clip_intersection2(&y, &len, u8g2->user_y0, u8g2->user_y1) == 0 )
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return;
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}
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u8g2->cb->draw_l90(u8g2, x, y, len, dir);
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}
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}
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void u8g2_DrawHLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len)
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{
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// #ifdef U8G2_WITH_INTERSECTION
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// if ( u8g2_IsIntersection(u8g2, x, y, x+len, y+1) == 0 )
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// return;
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// #endif /* U8G2_WITH_INTERSECTION */
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u8g2_DrawHVLine(u8g2, x, y, len, 0);
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}
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void u8g2_DrawVLine(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y, u8g2_uint_t len)
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{
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// #ifdef U8G2_WITH_INTERSECTION
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// if ( u8g2_IsIntersection(u8g2, x, y, x+1, y+len) == 0 )
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// return;
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// #endif /* U8G2_WITH_INTERSECTION */
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u8g2_DrawHVLine(u8g2, x, y, len, 1);
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}
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void u8g2_DrawPixel(u8g2_t *u8g2, u8g2_uint_t x, u8g2_uint_t y)
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{
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#ifdef U8G2_WITH_INTERSECTION
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if ( y < u8g2->user_y0 )
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return;
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if ( y >= u8g2->user_y1 )
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return;
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if ( x < u8g2->user_x0 )
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return;
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if ( x >= u8g2->user_x1 )
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return;
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#endif /* U8G2_WITH_INTERSECTION */
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u8g2_DrawHVLine(u8g2, x, y, 1, 0);
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}
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/*
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Assign the draw color for all drawing functions.
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color may be 0 or 1. The actual color is defined by the display.
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With color = 1 the drawing function will set the display memory to 1.
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For OLEDs this ususally means, that the pixel is enabled and the LED
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at the pixel is turned on.
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On an LCD it usually means that the LCD segment of the pixel is enabled,
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which absorbs the light.
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For eInk/ePaper it means black ink.
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7 Jan 2017: Allow color value 2 for XOR operation.
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*/
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void u8g2_SetDrawColor(u8g2_t *u8g2, uint8_t color)
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{
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u8g2->draw_color = color; /* u8g2_SetDrawColor: just assign the argument */
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if ( color >= 3 )
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u8g2->draw_color = 1; /* u8g2_SetDrawColor: make color as one if arg is invalid */
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}
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