[英]Algorithmic error with colour changing - Android
我在应用程序中遇到一些问题。 我正在使用画布从textobject(存储在列表中)中绘制文本,当发生碰撞时,我想将颜色从保存在textobject中的普通文本更改为红色。
对我来说最有趣的事情是,当我在两种情况下都使用Android定义的颜色时,一切正常。 我想这里有一些算法问题,但我找不到。
public class Board extends ViewGroup{
Paint textPaint;
public Board(Context context, AttributeSet attrs) {
//...
textPaint = new Paint();
//...
}
protected void onDraw(Canvas canvas) {
//...
int i = 0;
for (TextElement element : words) {
textSize = element.getSize() * scaleMap.get(i);
textPaint = element.getElementPaint();
if (inContact == i) {
textPaint.setColor(Color.RED);
} else {
textPaint.setColor(element.getElementPaint().getColor());
//when there is for example textPaint.setColor(Color.BLACK);
// everything is working
}
textPaint.setTextSize(textSize);
canvas.drawText(element.getText(), element.getX(), element.getY(),textPaint);
i++;
}
//...
}
}
在整个应用程序生命周期中,此类的对象仅创建一次。
编辑:
public class Board extends ViewGroup{
Paint textPaint;
List<TextElement> words = new ArrayList<TextElement>();
public Board(Context context, AttributeSet attrs) {
//...
textPaint = new Paint();
//...
}
protected void onDraw(Canvas canvas) {
//...
int i = 0;
for (TextElement element : words) {
textSize = element.getSize() * scaleMap.get(i);
textPaint = element.getElementPaint();
if (inContact == i) {
textPaint.setColor(Color.RED);
} else {
textPaint.setColor(element.getElementPaint().getColor());
//when there is for example textPaint.setColor(Color.BLACK);
// everything is working
}
textPaint.setTextSize(textSize);
canvas.drawText(element.getText(), element.getX(), element.getY(),textPaint);
i++;
}
//...
}
public void addText(String newWord) {
textPaint.setTextAlign(Paint.Align.LEFT);
textPaint.setTextSize(35);
textPaint.setColor(Color.BLUE);
TextElement newText = new TextElement(newWord, 35, textPaint, 10, 35);
words.add(newText);
scaleMap.add(words.size() - 1, 1.f);
collisionMap.add(words.size() - 1, new RectF());
}
}
我已经设法修复了。 我需要在绘画对象创建中进行一些小的更改。 有工作代码:
public class Board extends ViewGroup{
Paint textPaint;
List<TextElement> words = new ArrayList<TextElement>();
public Board(Context context, AttributeSet attrs) {
//...
textPaint = new Paint();
//...
}
protected void onDraw(Canvas canvas) {
//...
int i = 0;
for (TextElement element : words) {
textSize = element.getSize() * scaleMap.get(i);
if (inContact == i) {
textPaint.setColor(Color.RED);
} else {
textPaint.setColor(element.getElementPaint().getColor());
}
textPaint.setTextSize(textSize);
canvas.drawText(element.getText(), element.getX(), element.getY(),textPaint);
i++;
}
//...
}
public void addText(String newWord) {
Paint newTextPaint = new Paint();
newTextPaint.setTextAlign(Paint.Align.LEFT);
newTextPaint.setTextSize(35);
newTextPaint.setColor(Color.BLUE);
TextElement newText = new TextElement(newWord, 35, newTextPaint, 10, 35);
words.add(newText);
scaleMap.add(words.size() - 1, 1.f);
collisionMap.add(words.size() - 1, new RectF());
}
}
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