Mattia Iavarone
7 years ago
parent
1feb1c868b
commit
3a6666fdbc
@ -0,0 +1,94 @@ |
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package com.flurgle.camerakit; |
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import android.content.Context; |
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import android.graphics.Canvas; |
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import android.graphics.Color; |
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import android.graphics.drawable.ColorDrawable; |
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import android.graphics.drawable.Drawable; |
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import android.support.annotation.NonNull; |
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import android.support.annotation.Nullable; |
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import android.util.AttributeSet; |
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import android.util.TypedValue; |
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import android.view.View; |
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// TODO animate lines!
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public class GridLinesLayout extends View { |
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@Grid private int gridMode; |
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private final Drawable horiz; |
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private final Drawable vert; |
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private final float width; |
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private final static float GOLDEN_RATIO_INV = 0.61803398874989f; |
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public GridLinesLayout(@NonNull Context context) { |
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this(context, null); |
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} |
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public GridLinesLayout(@NonNull Context context, @Nullable AttributeSet attrs) { |
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super(context, attrs); |
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horiz = new ColorDrawable(Color.WHITE); horiz.setAlpha(160); |
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vert = new ColorDrawable(Color.WHITE); vert.setAlpha(160); |
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width = TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, 0.9f, context.getResources().getDisplayMetrics()); |
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} |
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@Override |
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protected void onLayout(boolean changed, int left, int top, int right, int bottom) { |
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super.onLayout(changed, left, top, right, bottom); |
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horiz.setBounds(left, 0, right, (int) width); |
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vert.setBounds(0, top, (int) width, bottom); |
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} |
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@Grid |
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int getGridMode() { |
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return gridMode; |
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} |
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void setGridMode(@Grid int gridMode) { |
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this.gridMode = gridMode; |
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invalidate(); |
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} |
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private int getLineCount() { |
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switch (gridMode) { |
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case CameraKit.Constants.GRID_OFF: return 0; |
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case CameraKit.Constants.GRID_3X3: return 2; |
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case CameraKit.Constants.GRID_PHI: return 2; |
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case CameraKit.Constants.GRID_4X4: return 3; |
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} |
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return 0; |
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} |
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private float getLinePosition(int lineNumber) { |
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int lineCount = getLineCount(); |
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if (gridMode == CameraKit.Constants.GRID_PHI) { |
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// 1 = 2x + GRIx
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// 1 = x(2+GRI)
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// x = 1/(2+GRI)
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float delta = 1f/(2+GOLDEN_RATIO_INV); |
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return lineNumber == 1 ? delta : (1 - delta); |
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} else { |
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return (1f / (lineCount + 1)) * (lineNumber + 1f); |
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} |
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} |
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@Override |
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protected void onDraw(Canvas canvas) { |
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super.onDraw(canvas); |
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int count = getLineCount(); |
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for (int n = 0; n < count; n++) { |
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float pos = getLinePosition(n); |
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// Draw horizontal line
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canvas.translate(0, pos * getHeight()); |
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horiz.draw(canvas); |
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canvas.translate(0, - pos * getHeight()); |
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// Draw vertical line
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canvas.translate(pos * getWidth(), 0); |
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vert.draw(canvas); |
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canvas.translate(- pos * getWidth(), 0); |
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} |
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} |
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} |
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@ -0,0 +1,16 @@ |
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package com.flurgle.camerakit; |
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import android.support.annotation.IntDef; |
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import java.lang.annotation.Retention; |
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import java.lang.annotation.RetentionPolicy; |
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import static com.flurgle.camerakit.CameraKit.Constants.GRID_OFF; |
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import static com.flurgle.camerakit.CameraKit.Constants.GRID_3X3; |
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import static com.flurgle.camerakit.CameraKit.Constants.GRID_4X4; |
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import static com.flurgle.camerakit.CameraKit.Constants.GRID_PHI; |
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@IntDef({GRID_OFF, GRID_3X3, GRID_4X4, GRID_PHI}) |
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@Retention(RetentionPolicy.SOURCE) |
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public @interface Grid { |
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} |
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