mirror of https://github.com/fltk/fltk
108 lines
3.7 KiB
C++
108 lines
3.7 KiB
C++
//
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// Unit tests for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2022 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// https://www.fltk.org/COPYING.php
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//
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// Please see the following page on how to report bugs and issues:
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//
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// https://www.fltk.org/bugs.php
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//
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#include "unittests.h"
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#include <FL/Fl_Box.H>
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#include <FL/Fl_Check_Button.H>
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#include <FL/fl_draw.H>
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//
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// --- fl_text_extents() tests -----------------------------------------------
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static void cb_base_bt(Fl_Widget *bt, void*) {
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bt->parent()->redraw();
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}
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//
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class Ut_Text_Extents_Test : public Fl_Group
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{
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Fl_Check_Button *base_bt;
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void draw_text_and_boxes(const char *txt, int X, int Y) {
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int wm = 0, hm = 0, wt = 0, ht = 0;
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int dx, dy;
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// measure text so we can draw the baseline first
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fl_measure(txt, wm, hm, 0);
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fl_text_extents(txt, dx, dy, wt, ht);
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// Draw a baseline before the boxes
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if (base_bt->value()) {
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fl_color(FL_BLUE);
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fl_line((X - 20), Y, (X + wt + 20), Y);
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}
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// Then we draw the bounding boxes (fl_measure and fl_text_extents)
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// draw fl_measure() typographical bounding box
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int desc = fl_descent();
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fl_color(FL_RED);
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fl_rect(X, Y-hm+desc, wm, hm);
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// draw fl_text_extents() glyph bounding box
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fl_color(FL_GREEN);
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fl_rect(X+dx, Y+dy, wt, ht);
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// Then we draw the text to show how it fits inside each of the two boxes
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fl_color(FL_BLACK);
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fl_draw(txt, X, Y);
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}
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public:
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static Fl_Widget *create() {
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return new Ut_Text_Extents_Test(UT_TESTAREA_X, UT_TESTAREA_Y, UT_TESTAREA_W, UT_TESTAREA_H);
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}
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Ut_Text_Extents_Test(int x, int y, int w, int h) : Fl_Group(x, y, w, h) {
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base_bt = new Fl_Check_Button(x + w - 150, 50, 130, 20, "Show Baseline");
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base_bt->box(FL_FLAT_BOX);
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base_bt->down_box(FL_DOWN_BOX);
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base_bt->callback(cb_base_bt);
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Fl_Box *dummy = new Fl_Box ((x + w - 4), (y + h - 4), 2, 2);
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resizable(dummy);
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end();
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}
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void draw(void) FL_OVERRIDE {
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int x0 = x(); // origin is current window position for Fl_Box
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int y0 = y();
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int w0 = w();
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int h0 = h();
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fl_push_clip(x0, y0, w0, h0); // reset local clipping
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{
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// set the background colour - slightly off-white to enhance the green bounding box
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fl_color(fl_gray_ramp(FL_NUM_GRAY - 3));
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fl_rectf(x0, y0, w0, h0);
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Fl_Group::draw();
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fl_font(FL_HELVETICA, 30);
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int xx = x0+55;
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int yy = y0+40;
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draw_text_and_boxes("!abcdeABCDE\"#A", xx, yy); yy += 50; // mixed string
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draw_text_and_boxes("oacs", xx, yy); xx += 100; // small glyphs
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draw_text_and_boxes("qjgIPT", xx, yy); yy += 50; xx -= 100; // glyphs with descenders
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draw_text_and_boxes("````````", xx, yy); yy += 50; // high small glyphs
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draw_text_and_boxes("--------", xx, yy); yy += 50; // mid small glyphs
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draw_text_and_boxes("________", xx, yy); yy += 50; // low small glyphs
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fl_font(FL_HELVETICA, 14);
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fl_color(FL_RED); fl_draw("fl_measure bounding box in RED", xx, yy); yy += 20;
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fl_color(FL_GREEN); fl_draw("fl_text_extents bounding box in GREEN", xx, yy);
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fl_color(FL_BLACK);
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xx = x0 + 10; yy += 30;
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fl_draw("NOTE: On systems with text anti-aliasing (e.g. macOS Quartz)", xx, yy);
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w0 = h0 = 0; fl_measure("NOTE: ", w0, h0, 0);
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xx += w0; yy += h0;
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fl_draw("text may leak slightly outside the fl_text_extents()", xx, yy);
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}
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fl_pop_clip(); // remove the local clip
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}
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};
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UnitTest textExtents(UT_TEST_TEXT, "Rendering Text", Ut_Text_Extents_Test::create);
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