gre-ilya/fltk
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity
54f44d5ac9
fltk/src/fl_oxy.cxx
Albrecht Schlosser 79ddf2f2b8 Optimize "arrow" drawing and centering 
- center (sub)menu arrow as good as possible
- adjust arrow sizes in Fl_Counter widget
- refactor "oxy" arrow drawing and centering in widgets
2024-05-09 19:46:07 +02:00

541 lines
17 KiB
C++
Raw Blame History

//
// "Oxy" Scheme drawing routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 2011 by Dmitrij K. aka "kdiman"
// Copyright 2012-2024 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// https://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// https://www.fltk.org/str.php
//
#include <FL/Fl.H>
#include <FL/fl_draw.H>
#include <FL/Fl_Rect.H>
#include "fl_oxy.h"
// Note:
//
// Drawing on the X11 platform w/o Cairo can be asymmetric for some "arrows"
#define GROFF 0.45f // gradients offset
#ifndef DEBUG_OXY_ARROW
#define DEBUG_OXY_ARROW 0 // 0 = off, 1 = cross at center position of arrows
#endif
// Draw a single arrow
static void single_arrow(Fl_Rect bb, Fl_Orientation o, Fl_Color col) {
int x1 = bb.x();
int y1 = bb.y();
int w1 = bb.w();
int h1 = bb.h();
float angle = int(o) * 45.0f;
// calculate arrow size
int dx = (w1 - 3) / 2;
if (h1 < w1) dx = (h1 - 3) / 2;
if (dx > 4) dx = 4;
else if (dx < 2) dx = 2;
// dx = (dx + 1) & (-2); // should be even ? not required
int tx = x1 + w1/2;
int ty = y1 + h1/2;
const int lw = 2; // arrow line width: n+1 pixels (must be even)
const int dw = 1; // half the line width
fl_color(col);
fl_line_style(FL_SOLID, 1);
fl_push_matrix();
fl_translate(tx, ty); // move to center
fl_rotate(angle); // rotate by given angle
// DEBUG: Draw a two-colored cross at the center of the arrow box
// This can be used to debug or adjust array alignment (centering)
#if (DEBUG_OXY_ARROW) // draw a cross at the center
int ll; // line length
fl_color(FL_BLUE); // "horizontal" line
ll = (o&2) ? h1/2 - 1 : w1/2 - 1; // line length
fl_begin_line();
fl_vertex(-ll, 0); fl_vertex(ll, 0);
fl_end_line();
fl_color(0x22882200); // "vertical" line
ll = (o&2) ? w1/2 - 1 : h1/2 - 1; // line length
fl_begin_line();
fl_vertex(0, -ll); fl_vertex(0, ll);
fl_end_line();
fl_color(col); // back to original color
#endif
// Draw the "arrow", similar to '>' at the center of the box
fl_begin_complex_polygon();
fl_vertex(-dx + dw, -dx);
fl_vertex( 0 + dw, 0);
fl_vertex(-dx + dw, dx);
fl_vertex(-dx + dw + lw, dx);
fl_vertex( 0 + dw + lw, 0);
fl_vertex(-dx + dw + lw, -dx);
fl_end_complex_polygon();
fl_pop_matrix();
fl_line_style(0);
}
/**
Draw an "arrow" GUI element for the 'oxy' scheme.
This draws one or two "arrows" depending on the arrow type \p t.
\param[in] bb bounding box
\param[in] t arrow type
\param[in] o orientation
\param[in] col arrow color
*/
void oxy_arrow(Fl_Rect bb, Fl_Arrow_Type t, Fl_Orientation o, Fl_Color col) {
switch(t) {
case FL_ARROW_DOUBLE:
switch (int(o)) {
case FL_ORIENT_DOWN:
case FL_ORIENT_UP:
bb.h(bb.h() - 4); // reduce size
single_arrow(bb, o, col);
bb.y(bb.y() + 4); // shift down
single_arrow(bb, o, col);
break;
default:
bb.w(bb.w() - 4); // reduce size
single_arrow(bb, o, col);
bb.x(bb.x() + 4); // shift right
single_arrow(bb, o, col);
break;
}
break;
case FL_ARROW_CHOICE:
bb.y(bb.y() - 1); // shift upwards
bb.h(bb.h() - 4); // reduce height
single_arrow(bb, FL_ORIENT_UP, col);
bb.y(bb.y() + 6); // shift down
single_arrow(bb, FL_ORIENT_DOWN, col);
break;
default:
single_arrow(bb, o, col);
break;
}
}
// draw gradient from South to North
static void _oxy_up_box_(int x, int y, int w, int h, Fl_Color bg) {
float groff = GROFF;
if (groff < 0.0) {
groff = 0.0f;
}
float gradoffset = groff;
float stepoffset = (1.0f / (float)h);
int xw = x + w - 1;
// from bottom to top
for (int _y = y; _y < y + h; _y++) {
fl_color(fl_color_average(bg, FL_WHITE, (gradoffset < 1.0f) ? gradoffset : 1.0f));
fl_xyline(x, _y, xw);
gradoffset += stepoffset;
}
}
// draw gradient from North to South
static void _oxy_down_box_(int x, int y, int w, int h, Fl_Color bg) {
float groff = GROFF;
if (groff < 0.0) {
groff = 0.0f;
}
float gradoffset = groff;
float stepoffset = (1.0f / (float)h);
int xw = x + w - 1;
// from top to bottom
for (int _y = y + h - 1; _y >= y; _y--) {
fl_color(fl_color_average(bg, FL_WHITE, (gradoffset < 1.0f) ? gradoffset : 1.0f));
fl_xyline(x, _y, xw);
gradoffset += stepoffset;
}
}
// draw gradient for button up box
static void _oxy_button_up_box_(int x, int y, int w, int h, Fl_Color bg) {
int half_h = h / 2;
float gradoffset = 0.15f;
float stepoffset = (1.0f / (float)half_h);
Fl_Color col = fl_color_average(bg, FL_WHITE, 0.5);
int xw = x + w - 1;
for (int _y = y; _y <= y + half_h; _y++) {
fl_color(fl_color_average(col, FL_WHITE, (gradoffset < 1.0f) ? gradoffset : 1.0f));
fl_xyline(x, _y, xw);
gradoffset += stepoffset;
}
gradoffset = 0.0f;
col = bg;
for (int _y = y + h - 1; _y >= y + half_h - 1; _y--) {
fl_color(fl_color_average(col, FL_WHITE, (gradoffset < 1.0f) ? gradoffset : 1.0f));
fl_xyline(x, _y, xw);
gradoffset += stepoffset;
}
}
// draw gradient for button down box
static void _oxy_button_down_box_(int x, int y, int w, int h, Fl_Color bg) {
bg = fl_color_average(bg, FL_BLACK, 0.88f);
int half_h = h / 2, xw = x + w - 1;
float gradoffset = 0.15f, stepoffset = (1.0f / (float)half_h);
Fl_Color col = fl_color_average(bg, FL_WHITE, 0.5);
for (int _y = y; _y <= y + half_h; _y++) {
fl_color(fl_color_average(col, FL_WHITE, (gradoffset < 1.0f) ? gradoffset : 1.0f));
fl_xyline(x, _y, xw);
gradoffset += stepoffset;
}
gradoffset = 0.0f;
col = bg;
for (int _y = y + h - 1; _y >= y + half_h - 1; _y--) {
fl_color(fl_color_average(col, FL_WHITE, (gradoffset < 1.0f) ? gradoffset : 1.0f));
fl_xyline(x, _y, xw);
gradoffset += stepoffset;
}
}
// draw rounded box
static void _oxy_rounded_box_(int x, int y, int w, int h, Fl_Color bg) {
fl_color(bg);
if (w > h) {
fl_pie(x, y, h, h, 90.0, 270.0); // right half of circle
fl_rectf(x + h / 2, y, w - h + 1, h); // rectangle between left and right half-circle
fl_pie(x + w - h, y, h, h, 0.0, 90.0); // top-left quarter of circle
fl_pie(x + w - h, y, h, h, 270.0, 360.0); // bottom-left quarter of circle
} else if (w == h) {
fl_pie(x, y, w, w, 0.0, 360.0);
} else {
fl_pie(x, y, w, w, 0.0, 180.0); // top half of circle
fl_rectf(x, y + w / 2, w, h - w + 1); // rectangle between top and bottom half-circle
fl_pie(x, y + h - w, w, w, 180.0, 360.0); // bottom half of circle
}
}
static Fl_Color oxy_color(Fl_Color col) {
if (Fl::draw_box_active()) {
return col;
} else {
return fl_inactive(col);
}
}
static void oxy_draw(int x, int y, int w, int h, Fl_Color col, int typebox, bool is_shadow) {
if (w < 1 || h < 1)
return;
int X, Y, W, H, X1, Y1;
// draw bg
if (typebox != _FL_OXY_UP_FRAME && typebox != _FL_OXY_DOWN_FRAME) {
X = x + 1;
Y = y + 1;
W = w - 2;
H = h - 2;
switch (typebox) {
case _FL_OXY_UP_BOX: {
_oxy_up_box_(X, Y, W, H, oxy_color(col));
break;
}
case _FL_OXY_DOWN_BOX: {
_oxy_down_box_(X, Y, W, H, oxy_color(col));
break;
}
case _FL_OXY_BUTTON_UP_BOX: {
_oxy_button_up_box_(X, Y, W, H, oxy_color(col));
break;
}
case _FL_OXY_BUTTON_DOWN_BOX: {
_oxy_button_down_box_(X, Y, W, H, oxy_color(col));
break;
}
case _FL_OXY_ROUND_UP_BOX:
case _FL_OXY_ROUND_DOWN_BOX:
_oxy_rounded_box_(x, y, w, h, oxy_color(fl_color_average(col, FL_WHITE, 0.82f)));
break;
default: { break; }
}
}
Fl_Color leftline = col, topline = col, rightline = col, bottomline = col;
if (typebox == _FL_OXY_ROUND_UP_BOX || typebox == _FL_OXY_ROUND_DOWN_BOX) {
leftline = fl_color_average(col, FL_WHITE, 0.88f);
leftline = topline = rightline = bottomline = fl_color_average(leftline, FL_BLACK, 0.97f);
}
else if (typebox == _FL_OXY_UP_BOX || typebox == _FL_OXY_UP_FRAME) {
topline = fl_color_average(col, FL_BLACK, 0.95f);
leftline = fl_color_average(col, FL_BLACK, 0.85f);
rightline = leftline;
bottomline = fl_color_average(col, FL_BLACK, 0.88f);
}
else if (typebox == _FL_OXY_DOWN_BOX || typebox == _FL_OXY_DOWN_FRAME) {
topline = fl_color_average(col, FL_BLACK, 0.88f);
leftline = fl_color_average(col, FL_BLACK, 0.85f);
rightline = leftline;
bottomline = fl_color_average(col, FL_BLACK, 0.95f);
}
else if (typebox == _FL_OXY_BUTTON_UP_BOX || typebox == _FL_OXY_BUTTON_DOWN_BOX) {
topline = leftline = rightline = bottomline = fl_color_average(col, FL_BLACK, 0.85f);
}
// draw border
if (typebox != _FL_OXY_ROUND_UP_BOX && typebox != _FL_OXY_ROUND_DOWN_BOX) {
// bottom side
fl_color(oxy_color(bottomline));
fl_line(x + 1, y + h - 1, x + w - 2, y + h - 1);
// right side
fl_color(oxy_color(rightline));
fl_line(x + w - 1, y + 1, x + w - 1, y + h - 2);
// top side
fl_color(oxy_color(topline));
fl_line(x + 1, y, x + w - 2, y);
// left side
fl_color(oxy_color(leftline));
fl_line(x, y + 1, x, y + h - 2);
}
// draw shadow
if (is_shadow) {
if (typebox == _FL_OXY_ROUND_UP_BOX) {
topline = fl_color_average(col, FL_WHITE, 0.35f);
bottomline = fl_color_average(col, FL_BLACK, 0.94f);
}
else if (typebox == _FL_OXY_ROUND_DOWN_BOX) {
topline = fl_color_average(col, FL_BLACK, 0.94f);
bottomline = fl_color_average(col, FL_WHITE, 0.35f);
}
else if (typebox == _FL_OXY_UP_BOX || typebox == _FL_OXY_UP_FRAME) {
topline = fl_color_average(col, FL_WHITE, 0.35f);
leftline = fl_color_average(col, FL_WHITE, 0.4f);
rightline = leftline;
bottomline = fl_color_average(col, FL_BLACK, 0.8f);
}
else if (typebox == _FL_OXY_DOWN_BOX || typebox == _FL_OXY_DOWN_FRAME) {
topline = fl_color_average(col, FL_BLACK, 0.8f);
leftline = fl_color_average(col, FL_BLACK, 0.94f);
rightline = leftline;
bottomline = fl_color_average(col, FL_WHITE, 0.35f);
}
int xw1 = x + w - 1;
int xw2 = x + w - 2;
int xw3 = x + w - 3;
int yh2 = y + h - 2;
int yh1 = y + h - 1;
if (typebox == _FL_OXY_UP_BOX || typebox == _FL_OXY_UP_FRAME) {
fl_color(oxy_color(topline));
X = x + 1;
Y = y + 1;
X1 = xw2;
Y1 = y + 1;
fl_line(X, Y, X1, Y1); // top line
fl_color(oxy_color(leftline));
X = x + 1;
Y = yh2;
X1 = x + 1;
Y1 = y + 2;
fl_line(X, Y, X1, Y1); // left line
fl_color(oxy_color(rightline));
X = xw2;
Y = y + 2;
X1 = xw2;
Y1 = yh2;
fl_line(X, Y, X1, Y1); // right line
fl_color(oxy_color(bottomline));
X = xw2;
Y = yh2;
X1 = x + 1;
Y1 = yh2;
fl_line(X, Y, X1, Y1); // bottom line
}
else if (typebox == _FL_OXY_DOWN_BOX || typebox == _FL_OXY_DOWN_FRAME) {
fl_color(oxy_color(topline));
X = x + 1;
Y = y + 1;
X1 = xw2;
Y1 = y + 1;
fl_line(X, Y, X1, Y1); // top line
fl_color(oxy_color(leftline));
X = x + 1;
Y = yh2;
X1 = x + 1;
Y1 = y + 2;
fl_line(X, Y, X1, Y1); // left line
fl_color(oxy_color(rightline));
X = xw2;
Y = y + 2;
X1 = xw2;
Y1 = yh2;
fl_line(X, Y, X1, Y1); // right line
fl_color(oxy_color(bottomline));
X = xw3;
Y = yh2;
X1 = x + 2;
Y1 = yh2;
fl_line(X, Y, X1, Y1); // bottom line
}
else if (typebox == _FL_OXY_ROUND_UP_BOX || typebox == _FL_OXY_ROUND_DOWN_BOX) {
int Radius, smooth;
int r_offset2; // quarter of smooth and half of smooth
if (w > h) {
smooth = w;
} else {
smooth = h;
}
// correcting `smooth'
if (smooth > 0 && (smooth * 3 > w || smooth * 3 > h)) {
if (h < w) {
smooth = h / 3;
} else {
smooth = w / 3;
}
}
r_offset2 = smooth / 2;
Radius = smooth * 3;
if (Radius == 3) {
Radius = 4;
}
fl_color(oxy_color(topline));
fl_line(x + 1, yh1 - smooth - r_offset2, x + 1, y + r_offset2 + smooth); // left side
fl_arc(x + 1, y + 1, Radius, Radius, 90.0, 180.0); // left-top corner
if (typebox == _FL_OXY_ROUND_DOWN_BOX) {
fl_arc(x + 1, y + 1, Radius + 1, Radius + 1, 90.0, 180.0);
} // left-top corner (DOWN_BOX)
fl_line(x + smooth + r_offset2, y + 1, xw1 - smooth - r_offset2, y + 1); // top side
fl_arc(xw1 - Radius, y + 1, Radius, Radius, 00.0, 90.0); // right-top corner
if (typebox == _FL_OXY_ROUND_DOWN_BOX) {
fl_arc(xw1 - Radius, y + 1, Radius + 1, Radius + 1, 00.0, 90.0);
} // right-top corner (DOWN_BOX)
fl_line(xw2, y + smooth + r_offset2, xw2, yh1 - smooth - r_offset2); // right side
fl_arc(x + 1, yh1 - Radius, Radius, Radius, 180.0, 200.0); // left-bottom corner
fl_arc(xw1 - Radius, yh1 - Radius, Radius, Radius, 340.0, 360.0); // right-bottom
fl_color(oxy_color(bottomline));
fl_arc(x + 1, yh1 - Radius, Radius, Radius, 200.0, 270.0); // left-bottom corner
if (typebox == _FL_OXY_ROUND_UP_BOX) {
fl_arc(x + 1, yh1 - Radius, Radius + 1, Radius + 1, 200.0, 270.0);
} // left-bottom corner (UP_BOX)
fl_line(xw1 - smooth - r_offset2, yh2, x + smooth + r_offset2, yh2); // bottom side
fl_arc(xw1 - Radius, yh1 - Radius, Radius, Radius, 270.0, 340.0); // right-bottom corner
if (typebox == _FL_OXY_ROUND_UP_BOX) {
fl_arc(xw1 - Radius, yh1 - Radius, Radius + 1, Radius + 1, 270.0, 340.0);
} // right-bottom corner
}
} // end `if (is_shadow)'
} // end `static void oxy_draw(...)'
void button_up_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_BUTTON_UP_BOX, true);
}
void button_down_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_BUTTON_DOWN_BOX, true);
}
void up_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_UP_BOX, true);
}
void down_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_DOWN_BOX, true);
}
void thin_up_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_UP_BOX, false);
}
void thin_down_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_DOWN_BOX, false);
}
void up_frame(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_UP_FRAME, true);
}
void down_frame(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_DOWN_FRAME, true);
}
void thin_up_frame(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_UP_FRAME, false);
}
void thin_down_frame(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_DOWN_FRAME, false);
}
void round_up_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_ROUND_UP_BOX, true);
}
void round_down_box(int x, int y, int w, int h, Fl_Color col) {
oxy_draw(x, y, w, h, col, _FL_OXY_ROUND_DOWN_BOX, true);
}
extern void fl_round_focus(Fl_Boxtype bt, int x, int y, int w, int h, Fl_Color fg, Fl_Color bg);
extern void fl_internal_boxtype(Fl_Boxtype, Fl_Box_Draw_F*, Fl_Box_Draw_Focus_F* =NULL);
Fl_Boxtype fl_define_FL_OXY_UP_BOX() {
fl_internal_boxtype(_FL_OXY_UP_BOX, up_box);
fl_internal_boxtype(_FL_OXY_DOWN_BOX, down_box);
fl_internal_boxtype(_FL_OXY_UP_FRAME, up_frame);
fl_internal_boxtype(_FL_OXY_DOWN_FRAME, down_frame);
fl_internal_boxtype(_FL_OXY_THIN_UP_BOX, thin_up_box);
fl_internal_boxtype(_FL_OXY_THIN_DOWN_BOX, thin_down_box);
fl_internal_boxtype(_FL_OXY_THIN_UP_FRAME, thin_up_frame);
fl_internal_boxtype(_FL_OXY_THIN_DOWN_FRAME, thin_down_frame);
fl_internal_boxtype(_FL_OXY_ROUND_UP_BOX, round_up_box, fl_round_focus);
fl_internal_boxtype(_FL_OXY_ROUND_DOWN_BOX, round_down_box, fl_round_focus);
fl_internal_boxtype(_FL_OXY_BUTTON_UP_BOX, button_up_box);
fl_internal_boxtype(_FL_OXY_BUTTON_DOWN_BOX, button_down_box);
return _FL_OXY_UP_BOX;
}
Reference in New Issue View Git Blame Copy Permalink