Android Open Source - android-plotter Scene

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From Project

Back to project page android-plotter.

License

The source code is released under:

Apache License

Java Source Code

package org.solovyev.android.plotter.meshes;
/* w  ww.j  ava2 s  .  c  om*/
import org.solovyev.android.plotter.Dimensions;

import javax.annotation.Nonnull;

// Spx = Scene pixels
// Gpx = Graph pixels
// Vpx = View pixels
final class Scene {
  private Scene() {
  }

  static final class Axis {

    final float length;
    final float lengthX;
    final float minLength;
    final float arrowLength;
    final float arrowWidth;

    public Axis(@Nonnull Dimensions.Scene scene, boolean y) {
      lengthX = scene.width();
      if (y) {
        length = scene.height();
      } else {
        length = scene.width();
      }
      minLength = Math.min(scene.width(), scene.height());
      arrowLength = minLength / 30;
      arrowWidth = minLength / 40;
    }

    @Nonnull
    public static Axis create(@Nonnull Dimensions.Scene scene, boolean y) {
      return new Axis(scene, y);
    }
  }

  static final class Ticks {

    final int count;
    final float step;
    final float width;
    final float axisLength;

    Ticks(int count, float step, float width) {
      this.count = count;
      this.step = step;
      this.width = width;
      this.axisLength = (count - 1) * step;
    }

    @Nonnull
    public static Ticks create(@Nonnull Dimensions.Graph graph, @Nonnull Axis axis) {
      final float sidePaddingSpx = 1.2f * axis.arrowLength;
      final float sidePaddingGpx = graph.toGraphX(sidePaddingSpx);
      final float tickWidthSpx = axis.arrowWidth / 3;

      final float graphWidthGpx = graph.width() - 2 * sidePaddingGpx;
      final float tickStepGpx = Meshes.getTickStep(graphWidthGpx, 10);

      int ticksCount = (int) (axis.lengthX / graph.toScreenX(tickStepGpx));
      if (ticksCount > 20) {
        ticksCount /= 2;
      }
      if (ticksCount < 10) {
        ticksCount *= 2;
      }
      if (ticksCount % 2 == 0) {
        ticksCount++;
      }
      float ticksStepSpx = axis.lengthX / ticksCount;
      float tickedAxisLengthSpx = (ticksCount - 1) * ticksStepSpx;

      float maxTickedAxisLengthSpx = axis.length - 2 * sidePaddingSpx;
      if (tickedAxisLengthSpx < maxTickedAxisLengthSpx) {
        while (tickedAxisLengthSpx < maxTickedAxisLengthSpx) {
          ticksCount += 2;
          tickedAxisLengthSpx = (ticksCount - 1) * ticksStepSpx;
        }
        ticksCount -= 2;
      } else if (tickedAxisLengthSpx > maxTickedAxisLengthSpx) {
        while (tickedAxisLengthSpx > maxTickedAxisLengthSpx) {
          ticksCount -= 2;
          tickedAxisLengthSpx = (ticksCount - 1) * ticksStepSpx;
        }
      }
      return new Ticks(ticksCount, ticksStepSpx, tickWidthSpx);
    }
  }
}

Java Source Code List

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