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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.bidi;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;
import android.graphics.Rect;
import android.graphics.Typeface;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
public class BiDiTestView extends View {
private static final String TAG = "BiDiTestView";
private static final int BORDER_PADDING = 4;
private static final int TEXT_PADDING = 16;
private static final int TEXT_SIZE = 32;
private static final int ORIGIN = 48;
private static final int DELTA_Y = TEXT_SIZE;
private static final float DEFAULT_ITALIC_SKEW_X = -0.25f;
private Paint paint = new Paint();
private Rect rect = new Rect();
private String NORMAL_TEXT;
private String NORMAL_LONG_TEXT;
private String ITALIC_TEXT;
private String BOLD_TEXT;
private String BOLD_ITALIC_TEXT;
private String ARABIC_TEXT;
private String CHINESE_TEXT;
private Typeface typeface;
public BiDiTestView(Context context) {
super(context);
init(context);
}
public BiDiTestView(Context context, AttributeSet attrs) {
super(context, attrs);
init(context);
}
public BiDiTestView(Context context, AttributeSet attrs, int defStyle) {
super(context, attrs, defStyle);
init(context);
}
private void init(Context context) {
NORMAL_TEXT = context.getString(R.string.normal_text);
NORMAL_LONG_TEXT = context.getString(R.string.normal_long_text);
ITALIC_TEXT = context.getString(R.string.italic_text);
BOLD_TEXT = context.getString(R.string.bold_text);
BOLD_ITALIC_TEXT = context.getString(R.string.bold_italic_text);
ARABIC_TEXT = context.getString(R.string.arabic_text);
CHINESE_TEXT = context.getString(R.string.chinese_text);
typeface = paint.getTypeface();
paint.setAntiAlias(true);
}
@Override
public void onDraw(Canvas canvas) {
drawInsideRect(canvas, Color.BLACK);
int deltaX = testString(canvas, NORMAL_TEXT, ORIGIN, ORIGIN, paint, typeface,
false, false, Paint.DIRECTION_LTR);
deltaX += testString(canvas, ITALIC_TEXT, ORIGIN + deltaX, ORIGIN, paint, typeface,
true, false, Paint.DIRECTION_LTR);
deltaX += testString(canvas, BOLD_TEXT, ORIGIN + deltaX, ORIGIN, paint, typeface,
false, true, Paint.DIRECTION_LTR);
deltaX += testString(canvas, BOLD_ITALIC_TEXT, ORIGIN + deltaX, ORIGIN, paint, typeface,
true, true, Paint.DIRECTION_LTR);
// Test with a long string
deltaX = testString(canvas, NORMAL_LONG_TEXT, ORIGIN, ORIGIN + 2 * DELTA_Y, paint, typeface,
false, false, Paint.DIRECTION_LTR);
// Test Arabic ligature
deltaX = testString(canvas, ARABIC_TEXT, ORIGIN, ORIGIN + 4 * DELTA_Y, paint, typeface,
false, false, Paint.DIRECTION_RTL);
// Test Chinese
deltaX = testString(canvas, CHINESE_TEXT, ORIGIN, ORIGIN + 6 * DELTA_Y, paint, typeface,
false, false, Paint.DIRECTION_LTR);
}
private int testString(Canvas canvas, String text, int x, int y, Paint paint, Typeface typeface,
boolean isItalic, boolean isBold, int dir) {
paint.setTypeface(typeface);
// Set paint properties
boolean oldFakeBold = paint.isFakeBoldText();
paint.setFakeBoldText(isBold);
float oldTextSkewX = paint.getTextSkewX();
if (isItalic) {
paint.setTextSkewX(DEFAULT_ITALIC_SKEW_X);
}
drawTextWithCanvasDrawText(text, canvas, x, y, TEXT_SIZE, Color.WHITE);
int length = text.length();
float[] advances = new float[length];
float textWidth = paint.getTextRunAdvances(text, 0, length, 0, length, 0, advances, 0);
logAdvances(text, textWidth, advances);
drawBoxAroundText(canvas, x, y, textWidth, TEXT_SIZE, Color.RED);
paint.setColor(Color.WHITE);
char[] glyphs = new char[2*length];
int count = getGlyphs(text, glyphs, dir);
logGlypths(glyphs, count);
drawTextWithDrawGlyph(canvas, glyphs, count, x, y + DELTA_Y);
// Restore old paint properties
paint.setFakeBoldText(oldFakeBold);
paint.setTextSkewX(oldTextSkewX);
return (int) Math.ceil(textWidth) + TEXT_PADDING;
}
private void drawTextWithDrawGlyph(Canvas canvas, char[] glyphs, int count, int x, int y) {
canvas.drawGlyphs(glyphs, 0, count, x, y, paint);
}
private void logGlypths(char[] glyphs, int count) {
Log.v(TAG, "GlyphIds - count=" + count);
for (int n = 0; n < count; n++) {
Log.v(TAG, "GlyphIds - Id[" + n + "]="+ (int)glyphs[n]);
}
}
private int getGlyphs(String text, char[] glyphs, int dir) {
// int dir = 1; // Paint.DIRECTION_LTR;
return paint.getTextGlypths(text, 0, text.length(), 0, text.length(), dir, glyphs);
}
private void drawInsideRect(Canvas canvas, int color) {
paint.setColor(color);
int width = getWidth();
int height = getHeight();
rect.set(BORDER_PADDING, BORDER_PADDING, width - BORDER_PADDING, height - BORDER_PADDING);
canvas.drawRect(rect, paint);
}
private void drawTextWithCanvasDrawText(String text, Canvas canvas,
float x, float y, float textSize, int color) {
paint.setColor(color);
paint.setTextSize(textSize);
canvas.drawText(text, x, y, paint);
}
private void drawBoxAroundText(Canvas canvas, int x, int y, float textWidth, int textSize,
int color) {
paint.setColor(color);
canvas.drawLine(x, y - textSize, x, y + 8, paint);
canvas.drawLine(x, y + 8, x + textWidth, y + 8, paint);
canvas.drawLine(x + textWidth, y - textSize, x + textWidth, y + 8, paint);
}
private void logAdvances(String text, float textWidth, float[] advances) {
Log.v(TAG, "Advances for text: " + text + " total=" + textWidth);
int length = advances.length;
for(int n=0; n<length; n++){
Log.v(TAG, "adv[" + n + "]=" + advances[n]);
}
}
}
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