"Positive/negative" graph meter style #1415
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This suppresses a "-Wshorten-64-to-32" warning in Clang 19.
This property distinguishes meters that have a (relatively) fixed "total" value and meters that do not have a definite maximum value. The former meters would be drawn as a "100% stacked bar" or "graph", and the latter could have their "total" values updated automatically in bar meter mode. This commit is a prerequisite for the feature "Graph meter dynamic scaling and percent graph drawing". Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
If "isPercentChart" of a meter is false, update its "total" value automatically in the bar meter mode. The "total" value is capped to DBL_MAX in order to ensure the division never produces NaN. The newly introduced Meter_computeSum() function will be reused by the feature "Graph meter dynamic scaling and percent graph drawing". Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Implement dynamic scaling for Graph meter mode, and separate it from "100% graph" drawing. This is controlled by the "isPercentChart" property of a MeterClass. If "isPercentChart" is true, the meter would be drawn as a "100% graph". Graph meters now expect the "total" value may change, and the newly changed "total" value no longer affects the percent graph drawings of earlier meter values. If "isPercentChart" is false, the meter would be drawn with a dynamic scale. Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Round the graph meter's dynamic scale to a power of two and print the graph scale. For a percent graph, a "%" character is printed in place of the scale. Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
This is a code quality change that avoids dependency on the hard-coded GRAPH_HEIGHT in GraphMeterMode_draw(). This doesn't enable variable graph heights per meter, but it makes room for implementing such feature. Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
This is a prerequisite for the feature "Graph meter coloring (with GraphData structure rework)". powerOf2Floor() will utilize __builtin_clz() or stdc_bit_floor_ui() (__builtin_clz() is preferred) if either is supported. popCount8() will utilize ARM NEON instructions and x86 POPCNT instruction if the machine supports either of them. I am not adopting the C23 standard interface stdc_count_ones_uc() yet, as I am not sure C libraries would implement it as fast as our version. Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Rewrite the entire graph meter drawing code to support color graph drawing in addition to the dynamic scaling (both can work together because of the new GraphData structure design). The colors of a graph are based on the percentages of item values of the meter. The rounding differences of each terminal character are addressed through the different numbers of braille dots. Due to low resolution of the character terminal, the rasterized colors may not look nice, but better than nothing. :) The new GraphData structure design has two technical limitations: * The height of a graph meter now has a limit of 8191 (terminal rows). * If dynamic scaling is used, the "total" value or scale of a graph now has to align to a power of 2. The code is designed with the anticipation that the graph height may change at runtime. No UI or option has been implemented for that yet. Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
Specifically 'PIXPERROW_*' and 'GraphMeterMode_dots*' constants. They were commented out rather than removed in the previous commit (for ease of code reviewing). Now this commit removes the constant defines for good.
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Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
This special case of "details" value would print as ':' in the ASCII display mode. It is used in "positive/negative" graph display only. Signed-off-by: Kang-Che Sung <explorer09@gmail.com>
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This is a proof of concept of the graph style as discussed in #1390. I post this so that people can try it and see how it looks.
Notice this code is based on #714 -- the first few commit are the same, while the last one is the real modification of the new graph style.