canvas_line.c

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// SPDX-FileCopyrightText: 2013-2019 pancake <pancake@nopcode.org>
// SPDX-License-Identifier: LGPL-3.0-only
 
#include <rz_cons.h>
 
#define W(y)    rz_cons_canvas_write(c, y)
#define G(x, y) rz_cons_canvas_gotoxy(c, x, y)
 
#define useUtf8      (rz_cons_singleton()->use_utf8)
#define useUtf8Curvy (rz_cons_singleton()->use_utf8_curvy)
 
#define DOTTED_LINE_HORIZ "┄"
#define DOTTED_LINE_VERT  "┊"
 
#define DASHED_LINE_VERT  "╵"
#define DASHED_LINE_HORIZ "╴"
 
enum {
    APEX_DOT = 0,
    DOT_APEX,
    REV_APEX_APEX,
    DOT_DOT,
    NRM_DOT,
    NRM_APEX,
    DOT_NRM,
    REV_APEX_NRM,
    NRM_NRM
};
 
static char *utf8_line_vert(int dot_style) {
    if (rz_cons_singleton()->dotted_lines) {
        switch (dot_style) {
        case DOT_STYLE_NORMAL: return RUNECODESTR_LINE_VERT;
        case DOT_STYLE_CONDITIONAL: return DOTTED_LINE_VERT;
        case DOT_STYLE_BACKEDGE: return DASHED_LINE_VERT;
        }
    }
    return RUNECODESTR_LINE_VERT;
}
 
static char *utf8_line_horiz(int dot_style) {
    if (rz_cons_singleton()->dotted_lines) {
        switch (dot_style) {
        case DOT_STYLE_NORMAL: return RUNECODESTR_LINE_HORIZ;
        case DOT_STYLE_CONDITIONAL: return DOTTED_LINE_HORIZ;
        case DOT_STYLE_BACKEDGE: return DASHED_LINE_HORIZ;
        }
    }
    return RUNECODESTR_LINE_HORIZ;
}
 
static void apply_line_style(RzConsCanvas *c, int x, int y, int x2, int y2,
    RzCanvasLineStyle *style, int isvert) {
    RzCons *cons = rz_cons_singleton();
    switch (style->color) {
    case LINE_UNCJMP:
        c->attr = cons->context->pal.graph_ujump;
        break;
    case LINE_TRUE:
        c->attr = cons->context->pal.graph_true;
        break;
    case LINE_FALSE:
        c->attr = cons->context->pal.graph_false;
        break;
    case LINE_NONE:
    default:
        c->attr = cons->context->pal.graph_ujump;
        break;
    }
    if (!c->color) {
        c->attr = Color_RESET;
    }
    switch (style->symbol) {
    case LINE_UNCJMP:
        if (G(x, y)) {
            if (isvert) {
                W("v");
            } else {
                W(">");
            }
        }
        break;
    case LINE_TRUE:
        if (G(x, y)) {
            W("t"); //\\");
        }
        break;
    case LINE_FALSE:
        if (G(x, y)) {
            W("f");
        }
        break;
    case LINE_NOSYM_VERT:
        if (G(x, y)) {
            W(useUtf8 ? utf8_line_vert(style->dot_style) : "|");
        }
        break;
    case LINE_NOSYM_HORIZ:
        if (G(x, y)) {
            W(useUtf8 ? utf8_line_horiz(style->dot_style) : "-");
        }
        break;
    case LINE_NONE:
    default:
        break;
    }
}
 
static void draw_horizontal_line(RzConsCanvas *c, int x, int y, int width, int style, int dot_style) {
    const char *l_corner = "?", *rz_corner = "?";
    int i;
 
    if (width < 1) {
        return;
    }
    /* do not render offscreen horizontal lines */
    if (y + c->sy < 0) {
        return;
    }
    if (y + c->sy > c->h) {
        return;
    }
 
    switch (style) {
    case APEX_DOT:
        if (useUtf8) {
            if (useUtf8Curvy) {
                l_corner = RUNECODESTR_CURVE_CORNER_BL;
                rz_corner = RUNECODESTR_CURVE_CORNER_TR;
            } else {
                l_corner = RUNECODESTR_CORNER_BL;
                rz_corner = RUNECODESTR_CORNER_TR;
            }
        } else {
            l_corner = "'";
            rz_corner = ".";
        }
        break;
    case DOT_APEX:
        if (useUtf8) {
            if (useUtf8Curvy) {
                l_corner = RUNECODESTR_CURVE_CORNER_TL;
                rz_corner = RUNECODESTR_CURVE_CORNER_BR;
            } else {
                l_corner = RUNECODESTR_CORNER_TL;
                rz_corner = RUNECODESTR_CORNER_BR;
            }
        } else {
            l_corner = ".";
            rz_corner = "'";
        }
        break;
    case REV_APEX_APEX:
        if (useUtf8) {
            if (useUtf8Curvy) {
                l_corner = RUNECODESTR_CURVE_CORNER_BL;
                rz_corner = RUNECODESTR_CURVE_CORNER_BR;
            } else {
                l_corner = RUNECODESTR_CORNER_BL;
                rz_corner = RUNECODESTR_CORNER_BR;
            }
        } else {
            l_corner = "`";
            rz_corner = "'";
        }
        break;
    case DOT_DOT:
        if (useUtf8) {
            if (useUtf8Curvy) {
                l_corner = RUNECODESTR_CURVE_CORNER_TL;
                rz_corner = RUNECODESTR_CURVE_CORNER_TR;
            } else {
                l_corner = RUNECODESTR_CORNER_TL;
                rz_corner = RUNECODESTR_CORNER_TR;
            }
        } else {
            l_corner = rz_corner = ".";
        }
        break;
    case NRM_DOT:
        if (useUtf8) {
            l_corner = utf8_line_horiz(dot_style);
            if (useUtf8Curvy) {
                rz_corner = RUNECODESTR_CURVE_CORNER_TR;
            } else {
                rz_corner = RUNECODESTR_CORNER_TR;
            }
        } else {
            l_corner = "-";
            rz_corner = ".";
        }
        break;
    case NRM_APEX:
        if (useUtf8) {
            l_corner = utf8_line_horiz(dot_style);
            if (useUtf8Curvy) {
                rz_corner = RUNECODESTR_CURVE_CORNER_BR;
            } else {
                rz_corner = RUNECODESTR_CORNER_BR;
            }
        } else {
            l_corner = "-";
            rz_corner = "'";
        }
        break;
    case DOT_NRM:
        if (useUtf8) {
            if (useUtf8Curvy) {
                l_corner = RUNECODESTR_CURVE_CORNER_TL;
            } else {
                l_corner = RUNECODESTR_CORNER_TL;
            }
            rz_corner = utf8_line_horiz(dot_style);
        } else {
            l_corner = ".";
            rz_corner = "-";
        }
        break;
    case REV_APEX_NRM:
        if (useUtf8) {
            if (useUtf8Curvy) {
                l_corner = RUNECODESTR_CURVE_CORNER_BL;
            } else {
                l_corner = RUNECODESTR_CORNER_BL;
            }
            rz_corner = utf8_line_horiz(dot_style);
        } else {
            l_corner = "`";
            rz_corner = "-";
        }
        break;
    case NRM_NRM:
    default:
        if (useUtf8) {
            l_corner = rz_corner = utf8_line_horiz(dot_style);
        } else {
            l_corner = rz_corner = "-";
        }
        break;
    }
 
    if (G(x, y)) {
        W(l_corner);
    }
 
    const char *hline = useUtf8 ? utf8_line_horiz(dot_style) : "-";
    rz_cons_break_push(NULL, NULL);
    for (i = x + 1; i < x + width - 1; i++) {
        if (rz_cons_is_breaked()) {
            break;
        }
        if (G(i, y)) {
            W(hline);
        }
    }
    rz_cons_break_pop();
 
    if (G(x + width - 1, y)) {
        W(rz_corner);
    }
}
 
static void draw_vertical_line(RzConsCanvas *c, int x, int y, int height, int dot_style) {
    int i;
    /* do not render offscreen vertical lines */
    if (x + c->sx < 0) {
        return;
    }
    if (x + c->sx > c->w) {
        return;
    }
    const char *vline = useUtf8 ? utf8_line_vert(dot_style) : "|";
    rz_cons_break_push(NULL, NULL);
    for (i = y; i < y + height; i++) {
        if (rz_cons_is_breaked()) {
            break;
        }
        if (G(x, i)) {
            W(vline);
        }
    }
    rz_cons_break_pop();
}
 
RZ_API void rz_cons_canvas_line_diagonal(RzConsCanvas *c, int x, int y, int x2, int y2, RzCanvasLineStyle *style) {
    if (x == x2 || y == y2) {
        style->dot_style = DOT_STYLE_NORMAL;
        rz_cons_canvas_line_square(c, x, y + 1, x2, y2, style);
        return;
    }
    apply_line_style(c, x, y, x2, y2, style, 1);
    if (y2 < y) {
        int tmp = y2;
        y2 = y;
        y = tmp;
        tmp = x2;
        x2 = x;
        x = tmp;
    }
    char chizzle[2] = { 0 }; // = '.';//my nizzle
    // destination
    int dx = abs(x2 - x);
    int dy = abs(y2 - y);
    // source
    int sx = (x < x2) ? 1 : -1;
    int sy = (y < y2) ? 1 : -1;
 
    int err = (dx > (dy ? dx : -dy)) / 2;
    int e2;
 
    // TODO: find if there's any collision in this line
loop:
    e2 = err;
    if (e2 > -dx) {
        *chizzle = '_';
        err -= dy;
        x += sx;
    }
    if (e2 < dy) {
        *chizzle = '|';
        err += dx;
        y += sy;
    }
    if ((e2 < dy) && (e2 > -dx)) {
        if (sy > 0) {
            *chizzle = (sx > 0) ? '\\' : '/';
        } else {
            *chizzle = (sx > 0) ? '/' : '\\';
        }
    }
    if (!(x == x2 && y == y2)) {
        int i = (*chizzle == '_' && sy < 0) ? 1 : 0;
        if (G(x, y - i)) {
            if (useUtf8) {
                switch (*chizzle) {
                case '/':
                    W("╯");
                    break;
                case '\\':
                    W("└");
                    break;
                case '|':
                    W("│");
                    break;
                case '_':
                    W("─");
                    break;
                default:
                    W("?");
                    break;
                }
            } else {
                W(chizzle);
            }
        }
        goto loop;
    }
    if (dx) {
        if (dy && (dx / dy) < 1) {
            if (G(x, y)) {
                W("|");
            }
        }
        if (G(x, y + 1)) {
            W("|");
        }
    }
    c->attr = Color_RESET;
}
 
RZ_API void rz_cons_canvas_line_square(RzConsCanvas *c, int x, int y, int x2, int y2, RzCanvasLineStyle *style) {
    int min_x = RZ_MIN(x, x2);
    int diff_x = RZ_ABS(x - x2);
    int diff_y = RZ_ABS(y - y2);
 
    apply_line_style(c, x, y, x2, y2, style, 1);
 
    // --
    // TODO: find if there's any collision in this line
    if (y2 - y > 1) {
        int hl = diff_y / 2 - 1;
        int hl2 = diff_y - hl;
        int w = diff_x == 0 ? 0 : diff_x + 1;
        int apex_style = min_x == x ? APEX_DOT : DOT_APEX;
        draw_vertical_line(c, x, y + 1, hl, style->dot_style);
        draw_vertical_line(c, x2, y + hl + 1, hl2, style->dot_style);
        draw_horizontal_line(c, min_x, y + hl + 1, w, apex_style, style->dot_style);
    } else {
        if (y2 == y) {
            draw_horizontal_line(c, min_x, y, diff_x + 1, DOT_DOT, style->dot_style);
        } else {
            if (x != x2) {
                draw_horizontal_line(c, min_x, y, diff_x + 1, REV_APEX_APEX, style->dot_style);
            }
            draw_vertical_line(c, x2, y2, diff_y, style->dot_style);
        }
    }
    c->attr = Color_RESET;
}
 
RZ_API void rz_cons_canvas_line_square_defined(RzConsCanvas *c, int x, int y, int x2, int y2, RzCanvasLineStyle *style, int bendpoint, int isvert) {
    if (!c->linemode) {
        rz_cons_canvas_line(c, x, y, x2, y2, style);
        return;
    }
    int min_x = RZ_MIN(x, x2);
    int diff_x = RZ_ABS(x - x2);
    int diff_y = RZ_ABS(y - y2);
    int min_y = RZ_MIN(y, y2);
 
    apply_line_style(c, x, y, x2, y2, style, isvert);
 
    if (isvert) {
        if (x2 == x) {
            draw_vertical_line(c, x, y + 1, diff_y + 1, style->dot_style);
        } else if (y2 - y > 1) {
            int h1 = 1 + bendpoint;
            int h2 = diff_y - h1;
            int w = diff_x == 0 ? 0 : diff_x + 1;
            int apex_style = min_x == x ? APEX_DOT : DOT_APEX;
            draw_vertical_line(c, x, y + 1, h1, style->dot_style);
            draw_horizontal_line(c, min_x, y + bendpoint + 2, w, apex_style, style->dot_style);
            draw_vertical_line(c, x2, y + h1 + 1 + 1, h2, style->dot_style);
        } else {
            // TODO: currently copy-pasted
            if (y2 == y) {
                draw_horizontal_line(c, min_x, y, diff_x + 1, DOT_DOT, style->dot_style);
            } else {
                if (x != x2) {
                    draw_horizontal_line(c, min_x, y, diff_x + 1, REV_APEX_APEX, style->dot_style);
                }
                draw_vertical_line(c, x2, y2, diff_y - 2, style->dot_style);
            }
        }
    } else {
        if (y2 == y) {
            draw_horizontal_line(c, min_x + 1, y, diff_x, NRM_NRM, style->dot_style);
        } else if (x2 - x > 1) {
            int w1 = 1 + bendpoint;
            int w2 = diff_x - w1;
            // int h = diff_x;// == 0 ? 0 : diff_x + 1;
            // int style = min_x == x ? APEX_DOT : DOT_APEX;
            // draw_vertical_line (c, x, y + 1, h1);
            draw_horizontal_line(c, x + 1, y, w1 + 1, y2 > y ? NRM_DOT : NRM_APEX, style->dot_style);
            // draw_horizontal_line (c, min_x, y + bendpoint + 2, w, style);
            draw_vertical_line(c, x + 1 + w1, min_y + 1, diff_y - 1, style->dot_style);
            // draw_vertical_line (c, x2, y + h1 + 1 + 1, h2);
            draw_horizontal_line(c, x + 1 + w1, y2, w2, y2 < y ? DOT_NRM : REV_APEX_NRM, style->dot_style);
        }
    }
    c->attr = Color_RESET;
}
 
RZ_API void rz_cons_canvas_line_back_edge(RzConsCanvas *c, int x, int y, int x2, int y2, RzCanvasLineStyle *style, int ybendpoint1, int xbendpoint, int ybendpoint2, int isvert) {
    if (!c->linemode) {
        rz_cons_canvas_line(c, x, y, x2, y2, style);
        return;
    }
    int min_x1 = RZ_MIN(x, xbendpoint);
    int min_x2 = RZ_MIN(x2, xbendpoint);
 
    int diff_x1 = RZ_ABS(x - xbendpoint);
    int diff_x2 = RZ_ABS(x2 - xbendpoint);
 
    int diff_y = RZ_ABS((y + ybendpoint1 + 1) - (y2 - ybendpoint2 - 1));
 
    int w1 = diff_x1 == 0 ? 0 : diff_x1 + 1;
    int w2 = diff_x2 == 0 ? 0 : diff_x2 + 1;
 
    apply_line_style(c, x, y, x2, y2, style, isvert);
 
    if (isvert) {
        draw_vertical_line(c, x, y + 1, ybendpoint1 + 1, style->dot_style);
        draw_horizontal_line(c, min_x1, y + ybendpoint1 + 2, w1, REV_APEX_APEX, style->dot_style);
        draw_vertical_line(c, xbendpoint, y2 - ybendpoint2 + 1, diff_y - 1, style->dot_style);
        draw_horizontal_line(c, min_x2, y2 - ybendpoint2, w2, DOT_DOT, style->dot_style);
        draw_vertical_line(c, x2, y2 - ybendpoint2 + 1, ybendpoint2 + 1, style->dot_style);
    } else {
        int miny1 = RZ_MIN(y, xbendpoint);
        int miny2 = RZ_MIN(y2, xbendpoint);
        int diff_y1 = RZ_ABS(y - xbendpoint);
        int diff_y2 = RZ_ABS(y2 - xbendpoint);
 
        draw_horizontal_line(c, x + 1, y, 1 + ybendpoint1 + 1, xbendpoint > y ? NRM_DOT : NRM_APEX, style->dot_style);
        draw_vertical_line(c, x + 1 + ybendpoint1 + 1, miny1 + 1, diff_y1 - 1, style->dot_style);
        draw_horizontal_line(c, x2 - ybendpoint2, xbendpoint, (x + 1 + ybendpoint1 + 1) - (x2 - ybendpoint2) + 1, xbendpoint > y ? REV_APEX_APEX : DOT_DOT, style->dot_style);
        draw_vertical_line(c, x2 - ybendpoint2, miny2 + 1, diff_y2 - 1, style->dot_style);
        draw_horizontal_line(c, x2 - ybendpoint2, y2, ybendpoint2 + 1, xbendpoint > y ? DOT_NRM : REV_APEX_NRM, style->dot_style);
    }
}