rewrote TimeRuler drawing function for improved code, performance, and functionality
This commit is contained in:
itsmattkc
@@ -127,108 +127,143 @@ void TimeRuler::paintEvent(QPaintEvent *)
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QPainter p(this);
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int64_t last_unit = -1;
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int last_sec = -1;
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double width_of_frame = timebase_dbl_ * scale_;
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double width_of_second = 0;
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do {
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width_of_second += timebase_dbl_;
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} while (width_of_second < 1.0);
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width_of_second *= scale_;
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double width_of_minute = width_of_second * 60;
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double width_of_hour = width_of_minute * 60;
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double width_of_day = width_of_hour * 24;
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// Depending on the scale, we don't need all the lines drawn or else they'll start to become unhelpful
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// Determine an even number to divide the frame count by
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int rough_frames_in_second = qRound(timebase_flipped_dbl_);
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int test_divider = 1;
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while (!((rough_frames_in_second%test_divider == 0 || test_divider > rough_frames_in_second)
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&& scale_ * test_divider * timebase_dbl_ >= minimum_gap_between_lines_)) {
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if (test_divider < rough_frames_in_second) {
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test_divider++;
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} else {
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test_divider += rough_frames_in_second;
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}
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double long_interval, short_interval;
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int long_rate;
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// Used for comparison, even if one unit can technically fit, we have to fit at least two for it to matter
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int doubled_gap = minimum_gap_between_lines_ * 2;
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if (width_of_day < doubled_gap) {
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long_interval = -1;
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short_interval = width_of_day;
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} else if (width_of_hour < doubled_gap) {
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long_interval = width_of_day;
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long_rate = 24;
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short_interval = width_of_hour;
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} else if (width_of_minute < doubled_gap) {
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long_interval = width_of_hour;
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long_rate = 60;
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short_interval = width_of_minute;
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} else if (width_of_second < doubled_gap) {
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long_interval = width_of_minute;
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long_rate = 60;
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short_interval = width_of_second;
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} else if (width_of_frame < doubled_gap) {
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long_interval = width_of_second;
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long_rate = qRound(timebase_flipped_dbl_);
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short_interval = width_of_frame;
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} else {
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// FIXME: Implement this...
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long_interval = width_of_second;
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short_interval = width_of_frame;
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}
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double reverse_divider = double(rough_frames_in_second) / double(test_divider);
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qreal real_divider = qMax(1.0, timebase_flipped_dbl_ / reverse_divider);
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// Set where the loop ends (affected by text)
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int loop_start = - playhead_width_;
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int loop_end = width() + playhead_width_;
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// Determine where it can draw text
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int text_skip = 1;
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int half_average_text_width = 0;
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int text_y = 0;
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if (text_visible_) {
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QFontMetrics fm = p.fontMetrics();
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double width_of_second = scale_;
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int average_text_width = QFontMetricsWidth(fm, Timecode::timestamp_to_timecode(0, timebase_, Timecode::CurrentDisplay()));
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half_average_text_width = average_text_width/2;
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while (width_of_second * text_skip < average_text_width) {
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text_skip++;
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}
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if (centered_text_) {
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loop_start = -half_average_text_width;
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loop_end += half_average_text_width;
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if (short_interval < minimum_gap_between_lines_) {
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if (long_interval == -1) {
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do {
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short_interval *= 2;
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} while (short_interval < minimum_gap_between_lines_);
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} else {
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loop_start = -average_text_width;
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}
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int div;
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text_y = fm.ascent();
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short_interval = long_interval;
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for (div=long_rate;div>0;div--) {
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if (long_rate%div == 0) {
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// This division produces a whole number
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double test_frame_width = long_interval / static_cast<double>(div);
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if (test_frame_width >= minimum_gap_between_lines_) {
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short_interval = test_frame_width;
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break;
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}
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}
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}
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}
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}
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// Set line color to main text color
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p.setBrush(Qt::NoBrush);
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p.setPen(palette().text().color());
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// Calculate where each line starts
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int line_top = text_visible_ ? text_height_ : 0;
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// Calculate line dimensions
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QFontMetrics fm = p.fontMetrics();
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int long_height = fm.height();
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int short_height = long_height/2;
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int long_y = height() - long_height;
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int short_y = height() - short_height;
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int line_bottom = height();
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// Calculate all three line lengths
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int line_length = text_height_;
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int line_sec_bottom = line_top + line_length;
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int line_halfsec_bottom = line_top + line_length / 3 * 2;
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int line_frame_bottom = line_top + line_length / 3;
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// Draw long lines
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int last_long_unit = -1;
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int last_short_unit = -1;
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int last_text_draw = INT_MIN;
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for (int i=loop_start;i<loop_end;i++) {
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int64_t unit = ScreenToUnit(i);
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// FIXME: Hardcoded number
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const int kAverageTextWidth = 200;
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// Check if enough space has passed since the last line drawn
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if (qFloor(double(unit)/real_divider) > qFloor(double(last_unit)/real_divider)) {
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for (int i=-kAverageTextWidth;i<width()+kAverageTextWidth;i++) {
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double screen_pt = static_cast<double>(i + scroll_);
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// Determine if this unit is a whole second or not
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int sec = qFloor(double(unit) * timebase_dbl_);
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if (long_interval > -1) {
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int this_long_unit = qFloor(screen_pt/long_interval);
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if (this_long_unit != last_long_unit) {
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int line_y = long_y;
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if (sec > last_sec) {
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// This line marks a second so we make it long
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p.drawLine(i, line_top, i, line_sec_bottom);
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last_sec = sec;
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// Try to draw text here
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if (text_visible_ && sec%text_skip == 0) {
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int64_t timestamp_here = Timecode::time_to_timestamp(rational(sec), timebase_);
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QString timecode_string = Timecode::timestamp_to_timecode(timestamp_here, timebase_, Timecode::CurrentDisplay());
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int text_x = i;
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if (text_visible_) {
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QRect text_rect;
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Qt::Alignment text_align;
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QString timecode_str = Timecode::timestamp_to_timecode(ScreenToUnit(i), timebase_, Timecode::CurrentDisplay());
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int timecode_width = QFontMetricsWidth(fm, timecode_str);
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int timecode_left;
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if (centered_text_) {
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text_x -= half_average_text_width;
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text_rect = QRect(i - kAverageTextWidth/2, 0, kAverageTextWidth, fm.height());
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text_align = Qt::AlignCenter;
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timecode_left = i - timecode_width/2;
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} else {
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timecode_string.prepend(" ");
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p.drawLine(i, 0, i, line_top);
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text_rect = QRect(i, 0, kAverageTextWidth, fm.height());
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text_align = Qt::AlignLeft | Qt::AlignVCenter;
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timecode_left = i;
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// Add gap to left between line and text
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timecode_str.prepend(' ');
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}
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p.drawText(text_x, text_y, timecode_string);
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if (timecode_left > last_text_draw) {
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p.drawText(text_rect,
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text_align,
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timecode_str);
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last_text_draw = timecode_left + timecode_width;
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if (!centered_text_) {
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line_y = 0;
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}
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}
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}
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} else if (unit%rough_frames_in_second == rough_frames_in_second/2) {
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// This line marks the half second point so we make it somewhere in between
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p.drawLine(i, line_top, i, line_halfsec_bottom);
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} else {
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// This line just marks a frame so we make it short
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p.drawLine(i, line_top, i, line_frame_bottom);
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p.drawLine(i, line_y, i, line_bottom);
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last_long_unit = this_long_unit;
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}
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}
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last_unit = unit;
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if (short_interval > -1) {
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int this_short_unit = qFloor(screen_pt/short_interval);
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if (this_short_unit != last_short_unit) {
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p.drawLine(i, short_y, i, line_bottom);
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last_short_unit = this_short_unit;
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}
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}
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}
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