- var scale, low_val, high_val;
- for (i = -10; i < 50; i++) {
- var base_scale;
- if (kmg2) {
- base_scale = pow(16, i);
- } else {
- base_scale = pow(10, i);
- }
- var spacing = 0;
- for (j = 0; j < mults.length; j++) {
- scale = base_scale * mults[j];
- low_val = Math.floor(a / scale) * scale;
- high_val = Math.ceil(b / scale) * scale;
- nTicks = Math.abs(high_val - low_val) / scale;
- spacing = pixels / nTicks;
- // wish I could break out of both loops at once...
- if (spacing > pixels_per_tick) break;
- }
+
+ var wanted_ticks = pixels / pixels_per_tick;
+ var units_per_tick = Math.abs(b - a) / wanted_ticks;
+ var base_power = Math.floor(Math.log(units_per_tick) / Math.log(base));
+ var base_scale = Math.pow(base, base_power);
+ var scale, low_val, high_val, nTicks, spacing;
+ for (j = 0; j < mults.length; j++) {
+ scale = base_scale * mults[j];
+ low_val = Math.floor(a / scale) * scale;
+ high_val = Math.ceil(b / scale) * scale;
+ nTicks = Math.abs(high_val - low_val) / scale;
+ spacing = pixels / nTicks;